Release 4.11 mm/vmalloc.c

Directory: mm
/*
 *  linux/mm/vmalloc.c
 *
 *  Copyright (C) 1993  Linus Torvalds
 *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
 *  SMP-safe vmalloc/vfree/ioremap, Tigran Aivazian <tigran@veritas.com>, May 2000
 *  Major rework to support vmap/vunmap, Christoph Hellwig, SGI, August 2002
 *  Numa awareness, Christoph Lameter, SGI, June 2005
 */

#include <linux/vmalloc.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/debugobjects.h>
#include <linux/kallsyms.h>
#include <linux/list.h>
#include <linux/notifier.h>
#include <linux/rbtree.h>
#include <linux/radix-tree.h>
#include <linux/rcupdate.h>
#include <linux/pfn.h>
#include <linux/kmemleak.h>
#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/llist.h>
#include <linux/bitops.h>

#include <linux/uaccess.h>
#include <asm/tlbflush.h>
#include <asm/shmparam.h>

#include "internal.h"


struct vfree_deferred {
	
struct llist_head list;
	
struct work_struct wq;
};
static DEFINE_PER_CPU(struct vfree_deferred, vfree_deferred);

static void __vunmap(const void *, int);



static void free_work(struct work_struct *w)
{
	struct vfree_deferred *p = container_of(w, struct vfree_deferred, wq);
	struct llist_node *llnode = llist_del_all(&p->list);
	while (llnode) {
		void *p = llnode;
		llnode = llist_next(llnode);
		__vunmap(p, 1);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Al Viro 65 100.00% 1 100.00%
Total 65 100.00% 1 100.00%

/*** Page table manipulation functions ***/



static void vunmap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end)
{
	pte_t *pte;

	pte = pte_offset_kernel(pmd, addr);
	do {
		pte_t ptent = ptep_get_and_clear(&init_mm, addr, pte);
		WARN_ON(!pte_none(ptent) && !pte_present(ptent));
	} while (pte++, addr += PAGE_SIZE, addr != end);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 43 56.58% 6 60.00%
Hugh Dickins 24 31.58% 1 10.00%
David S. Miller 4 5.26% 1 10.00%
Christoph Hellwig 4 5.26% 1 10.00%
Ingo Molnar 1 1.32% 1 10.00%
Total 76 100.00% 10 100.00%



static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end)
{
	pmd_t *pmd;
	unsigned long next;

	pmd = pmd_offset(pud, addr);
	do {
		next = pmd_addr_end(addr, end);
		if (pmd_clear_huge(pmd))
			continue;
		if (pmd_none_or_clear_bad(pmd))
			continue;
		vunmap_pte_range(pmd, addr, next);
	} while (pmd++, addr = next, addr != end);
}

Contributors
Person Tokens Prop Commits CommitProp
Hugh Dickins 36 41.86% 2 22.22%
Linus Torvalds (pre-git) 35 40.70% 4 44.44%
Toshi Kani 8 9.30% 1 11.11%
Christoph Hellwig 4 4.65% 1 11.11%
Andi Kleen 3 3.49% 1 11.11%
Total 86 100.00% 9 100.00%



static void vunmap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end)
{
	pud_t *pud;
	unsigned long next;

	pud = pud_offset(p4d, addr);
	do {
		next = pud_addr_end(addr, end);
		if (pud_clear_huge(pud))
			continue;
		if (pud_none_or_clear_bad(pud))
			continue;
		vunmap_pmd_range(pud, addr, next);
	} while (pud++, addr = next, addr != end);
}

Contributors
Person Tokens Prop Commits CommitProp
Andi Kleen 42 48.84% 1 20.00%
Hugh Dickins 33 38.37% 2 40.00%
Toshi Kani 8 9.30% 1 20.00%
Kirill A. Shutemov 3 3.49% 1 20.00%
Total 86 100.00% 5 100.00%



static void vunmap_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end)
{
	p4d_t *p4d;
	unsigned long next;

	p4d = p4d_offset(pgd, addr);
	do {
		next = p4d_addr_end(addr, end);
		if (p4d_clear_huge(p4d))
			continue;
		if (p4d_none_or_clear_bad(p4d))
			continue;
		vunmap_pud_range(p4d, addr, next);
	} while (p4d++, addr = next, addr != end);
}

Contributors
Person Tokens Prop Commits CommitProp
Kirill A. Shutemov 86 100.00% 1 100.00%
Total 86 100.00% 1 100.00%



static void vunmap_page_range(unsigned long addr, unsigned long end)
{
	pgd_t *pgd;
	unsigned long next;

	BUG_ON(addr >= end);
	pgd = pgd_offset_k(addr);
	do {
		next = pgd_addr_end(addr, end);
		if (pgd_none_or_clear_bad(pgd))
			continue;
		vunmap_p4d_range(pgd, addr, next);
	} while (pgd++, addr = next, addr != end);
}

Contributors
Person Tokens Prop Commits CommitProp
Hugh Dickins 47 59.49% 2 20.00%
Linus Torvalds (pre-git) 21 26.58% 4 40.00%
Benjamin Herrenschmidt 6 7.59% 1 10.00%
Nicholas Piggin 3 3.80% 1 10.00%
Andrew Morton 1 1.27% 1 10.00%
Kirill A. Shutemov 1 1.27% 1 10.00%
Total 79 100.00% 10 100.00%



static int vmap_pte_range(pmd_t *pmd, unsigned long addr,
		unsigned long end, pgprot_t prot, struct page **pages, int *nr)
{
	pte_t *pte;

	/*
         * nr is a running index into the array which helps higher level
         * callers keep track of where we're up to.
         */

	pte = pte_alloc_kernel(pmd, addr);
	if (!pte)
		return -ENOMEM;
	do {
		struct page *page = pages[*nr];

		if (WARN_ON(!pte_none(*pte)))
			return -EBUSY;
		if (WARN_ON(!page))
			return -ENOMEM;
		set_pte_at(&init_mm, addr, pte, mk_pte(page, prot));
		(*nr)++;
	} while (pte++, addr += PAGE_SIZE, addr != end);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 48 35.29% 4 40.00%
Hugh Dickins 45 33.09% 1 10.00%
Nicholas Piggin 20 14.71% 1 10.00%
Andrew Morton 17 12.50% 1 10.00%
Christoph Hellwig 4 2.94% 1 10.00%
Ingo Molnar 1 0.74% 1 10.00%
Oleg Nesterov 1 0.74% 1 10.00%
Total 136 100.00% 10 100.00%



static int vmap_pmd_range(pud_t *pud, unsigned long addr,
		unsigned long end, pgprot_t prot, struct page **pages, int *nr)
{
	pmd_t *pmd;
	unsigned long next;

	pmd = pmd_alloc(&init_mm, pud, addr);
	if (!pmd)
		return -ENOMEM;
	do {
		next = pmd_addr_end(addr, end);
		if (vmap_pte_range(pmd, addr, next, prot, pages, nr))
			return -ENOMEM;
	} while (pmd++, addr = next, addr != end);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Andi Kleen 68 61.82% 1 25.00%
Hugh Dickins 34 30.91% 1 25.00%
Nicholas Piggin 6 5.45% 1 25.00%
Andrew Morton 2 1.82% 1 25.00%
Total 110 100.00% 4 100.00%



static int vmap_pud_range(p4d_t *p4d, unsigned long addr,
		unsigned long end, pgprot_t prot, struct page **pages, int *nr)
{
	pud_t *pud;
	unsigned long next;

	pud = pud_alloc(&init_mm, p4d, addr);
	if (!pud)
		return -ENOMEM;
	do {
		next = pud_addr_end(addr, end);
		if (vmap_pmd_range(pud, addr, next, prot, pages, nr))
			return -ENOMEM;
	} while (pud++, addr = next, addr != end);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Hugh Dickins 64 58.18% 1 12.50%
Andi Kleen 16 14.55% 1 12.50%
Christoph Hellwig 8 7.27% 1 12.50%
Linus Torvalds (pre-git) 7 6.36% 1 12.50%
Nicholas Piggin 6 5.45% 1 12.50%
Andrew Morton 6 5.45% 2 25.00%
Kirill A. Shutemov 3 2.73% 1 12.50%
Total 110 100.00% 8 100.00%



static int vmap_p4d_range(pgd_t *pgd, unsigned long addr,
		unsigned long end, pgprot_t prot, struct page **pages, int *nr)
{
	p4d_t *p4d;
	unsigned long next;

	p4d = p4d_alloc(&init_mm, pgd, addr);
	if (!p4d)
		return -ENOMEM;
	do {
		next = p4d_addr_end(addr, end);
		if (vmap_pud_range(p4d, addr, next, prot, pages, nr))
			return -ENOMEM;
	} while (p4d++, addr = next, addr != end);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Kirill A. Shutemov 110 100.00% 1 100.00%
Total 110 100.00% 1 100.00%

/*
 * Set up page tables in kva (addr, end). The ptes shall have prot "prot", and
 * will have pfns corresponding to the "pages" array.
 *
 * Ie. pte at addr+N*PAGE_SIZE shall point to pfn corresponding to pages[N]
 */


static int vmap_page_range_noflush(unsigned long start, unsigned long end,
				   pgprot_t prot, struct page **pages)
{
	pgd_t *pgd;
	unsigned long next;
	unsigned long addr = start;
	int err = 0;
	int nr = 0;

	BUG_ON(addr >= end);
	pgd = pgd_offset_k(addr);
	do {
		next = pgd_addr_end(addr, end);
		err = vmap_p4d_range(pgd, addr, next, prot, pages, &nr);
		if (err)
			return err;
	} while (pgd++, addr = next, addr != end);

	return nr;
}

Contributors
Person Tokens Prop Commits CommitProp
Hugh Dickins 39 33.91% 1 7.69%
Christoph Hellwig 22 19.13% 1 7.69%
Nicholas Piggin 19 16.52% 1 7.69%
Linus Torvalds (pre-git) 8 6.96% 3 23.08%
Adam Lackorzynski 7 6.09% 1 7.69%
Andi Kleen 6 5.22% 1 7.69%
Andrew Morton 6 5.22% 1 7.69%
Marcus Alanen 3 2.61% 1 7.69%
Figo.zhang 3 2.61% 1 7.69%
Kirill A. Shutemov 1 0.87% 1 7.69%
Tejun Heo 1 0.87% 1 7.69%
Total 115 100.00% 13 100.00%



static int vmap_page_range(unsigned long start, unsigned long end,
			   pgprot_t prot, struct page **pages)
{
	int ret;

	ret = vmap_page_range_noflush(start, end, prot, pages);
	flush_cache_vmap(start, end);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%



int is_vmalloc_or_module_addr(const void *x)
{
	/*
         * ARM, x86-64 and sparc64 put modules in a special place,
         * and fall back on vmalloc() if that fails. Others
         * just put it in the vmalloc space.
         */
#if defined(CONFIG_MODULES) && defined(MODULES_VADDR)
	unsigned long addr = (unsigned long)x;
	if (addr >= MODULES_VADDR && addr < MODULES_END)
		return 1;
#endif
	return is_vmalloc_addr(x);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds 52 98.11% 1 50.00%
Russell King 1 1.89% 1 50.00%
Total 53 100.00% 2 100.00%

/*
 * Walk a vmap address to the struct page it maps.
 */


struct page *vmalloc_to_page(const void *vmalloc_addr)
{
	unsigned long addr = (unsigned long) vmalloc_addr;
	struct page *page = NULL;
	pgd_t *pgd = pgd_offset_k(addr);
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *ptep, pte;

	/*
         * XXX we might need to change this if we add VIRTUAL_BUG_ON for
         * architectures that do not vmalloc module space
         */
	VIRTUAL_BUG_ON(!is_vmalloc_or_module_addr(vmalloc_addr));

	if (pgd_none(*pgd))
		return NULL;
	p4d = p4d_offset(pgd, addr);
	if (p4d_none(*p4d))
		return NULL;
	pud = pud_offset(p4d, addr);
	if (pud_none(*pud))
		return NULL;
	pmd = pmd_offset(pud, addr);
	if (pmd_none(*pmd))
		return NULL;

	ptep = pte_offset_map(pmd, addr);
	pte = *ptep;
	if (pte_present(pte))
		page = pte_page(pte);
	pte_unmap(ptep);
	return page;
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 99 57.23% 2 28.57%
Kirill A. Shutemov 52 30.06% 1 14.29%
Vassili Karpov 12 6.94% 1 14.29%
Jiri Slaby 8 4.62% 1 14.29%
Ingo Molnar 1 0.58% 1 14.29%
Linus Torvalds 1 0.58% 1 14.29%
Total 173 100.00% 7 100.00%


EXPORT_SYMBOL(vmalloc_to_page);

/*
 * Map a vmalloc()-space virtual address to the physical page frame number.
 */


unsigned long vmalloc_to_pfn(const void *vmalloc_addr)
{
	return page_to_pfn(vmalloc_to_page(vmalloc_addr));
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 15 75.00% 2 66.67%
Vassili Karpov 5 25.00% 1 33.33%
Total 20 100.00% 3 100.00%


EXPORT_SYMBOL(vmalloc_to_pfn);


/*** Global kva allocator ***/


#define VM_VM_AREA	0x04

static DEFINE_SPINLOCK(vmap_area_lock);
/* Export for kexec only */

LIST_HEAD(vmap_area_list);
static LLIST_HEAD(vmap_purge_list);

static struct rb_root vmap_area_root = RB_ROOT;

/* The vmap cache globals are protected by vmap_area_lock */

static struct rb_node *free_vmap_cache;

static unsigned long cached_hole_size;

static unsigned long cached_vstart;

static unsigned long cached_align;


static unsigned long vmap_area_pcpu_hole;



static struct vmap_area *__find_vmap_area(unsigned long addr)
{
	struct rb_node *n = vmap_area_root.rb_node;

	while (n) {
		struct vmap_area *va;

		va = rb_entry(n, struct vmap_area, rb_node);
		if (addr < va->va_start)
			n = n->rb_left;
		else if (addr >= va->va_end)
			n = n->rb_right;
		else
			return va;
	}

	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 54 67.50% 1 20.00%
James Bottomley 20 25.00% 1 20.00%
Hirofumi Ogawa 3 3.75% 1 20.00%
Daisuke Hatayama 2 2.50% 1 20.00%
Christoph Hellwig 1 1.25% 1 20.00%
Total 80 100.00% 5 100.00%



static void __insert_vmap_area(struct vmap_area *va)
{
	struct rb_node **p = &vmap_area_root.rb_node;
	struct rb_node *parent = NULL;
	struct rb_node *tmp;

	while (*p) {
		struct vmap_area *tmp_va;

		parent = *p;
		tmp_va = rb_entry(parent, struct vmap_area, rb_node);
		if (va->va_start < tmp_va->va_end)
			p = &(*p)->rb_left;
		else if (va->va_end > tmp_va->va_start)
			p = &(*p)->rb_right;
		else
			BUG();
	}

	rb_link_node(&va->rb_node, parent, p);
	rb_insert_color(&va->rb_node, &vmap_area_root);

	/* address-sort this list */
	tmp = rb_prev(&va->rb_node);
	if (tmp) {
		struct vmap_area *prev;
		prev = rb_entry(tmp, struct vmap_area, rb_node);
		list_add_rcu(&va->list, &prev->list);
	} else
		list_add_rcu(&va->list, &vmap_area_list);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 169 88.95% 1 20.00%
Linus Torvalds (pre-git) 15 7.89% 1 20.00%
Namhyung Kim 4 2.11% 1 20.00%
Christoph Lameter 1 0.53% 1 20.00%
JoonSoo Kim 1 0.53% 1 20.00%
Total 190 100.00% 5 100.00%

static void purge_vmap_area_lazy(void);

static BLOCKING_NOTIFIER_HEAD(vmap_notify_list);

/*
 * Allocate a region of KVA of the specified size and alignment, within the
 * vstart and vend.
 */


static struct vmap_area *alloc_vmap_area(unsigned long size,
				unsigned long align,
				unsigned long vstart, unsigned long vend,
				int node, gfp_t gfp_mask)
{
	struct vmap_area *va;
	struct rb_node *n;
	unsigned long addr;
	int purged = 0;
	struct vmap_area *first;

	BUG_ON(!size);
	BUG_ON(offset_in_page(size));
	BUG_ON(!is_power_of_2(align));

	might_sleep();

	va = kmalloc_node(sizeof(struct vmap_area),
			gfp_mask & GFP_RECLAIM_MASK, node);
	if (unlikely(!va))
		return ERR_PTR(-ENOMEM);

	/*
         * Only scan the relevant parts containing pointers to other objects
         * to avoid false negatives.
         */
	kmemleak_scan_area(&va->rb_node, SIZE_MAX, gfp_mask & GFP_RECLAIM_MASK);

retry:
	spin_lock(&vmap_area_lock);
	/*
         * Invalidate cache if we have more permissive parameters.
         * cached_hole_size notes the largest hole noticed _below_
         * the vmap_area cached in free_vmap_cache: if size fits
         * into that hole, we want to scan from vstart to reuse
         * the hole instead of allocating above free_vmap_cache.
         * Note that __free_vmap_area may update free_vmap_cache
         * without updating cached_hole_size or cached_align.
         */
	if (!free_vmap_cache ||
			size < cached_hole_size ||
			vstart < cached_vstart ||
			align < cached_align) {
nocache:
		cached_hole_size = 0;
		free_vmap_cache = NULL;
	}
	/* record if we encounter less permissive parameters */
	cached_vstart = vstart;
	cached_align = align;

	/* find starting point for our search */
	if (free_vmap_cache) {
		first = rb_entry(free_vmap_cache, struct vmap_area, rb_node);
		addr = ALIGN(first->va_end, align);
		if (addr < vstart)
			goto nocache;
		if (addr + size < addr)
			goto overflow;

	} else {
		addr = ALIGN(vstart, align);
		if (addr + size < addr)
			goto overflow;

		n = vmap_area_root.rb_node;
		first = NULL;

		while (n) {
			struct vmap_area *tmp;
			tmp = rb_entry(n, struct vmap_area, rb_node);
			if (tmp->va_end >= addr) {
				first = tmp;
				if (tmp->va_start <= addr)
					break;
				n = n->rb_left;
			} else
				n = n->rb_right;
		}

		if (!first)
			goto found;
	}

	/* from the starting point, walk areas until a suitable hole is found */
	while (addr + size > first->va_start && addr + size <= vend) {
		if (addr + cached_hole_size < first->va_start)
			cached_hole_size = first->va_start - addr;
		addr = ALIGN(first->va_end, align);
		if (addr + size < addr)
			goto overflow;

		if (list_is_last(&first->list, &vmap_area_list))
			goto found;

		first = list_next_entry(first, list);
	}

found:
	if (addr + size > vend)
		goto overflow;

	va->va_start = addr;
	va->va_end = addr + size;
	va->flags = 0;
	__insert_vmap_area(va);
	free_vmap_cache = &va->rb_node;
	spin_unlock(&vmap_area_lock);

	BUG_ON(!IS_ALIGNED(va->va_start, align));
	BUG_ON(va->va_start < vstart);
	BUG_ON(va->va_end > vend);

	return va;

overflow:
	spin_unlock(&vmap_area_lock);
	if (!purged) {
		purge_vmap_area_lazy();
		purged = 1;
		goto retry;
	}

	if (gfpflags_allow_blocking(gfp_mask)) {
		unsigned long freed = 0;
		blocking_notifier_call_chain(&vmap_notify_list, 0, &freed);
		if (freed > 0) {
			purged = 0;
			goto retry;
		}
	}

	if (printk_ratelimit())
		pr_warn("vmap allocation for size %lu failed: use vmalloc=<size> to increase size\n",
			size);
	kfree(va);
	return ERR_PTR(-EBUSY);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 485 83.19% 3 18.75%
Chris Wilson 42 7.20% 1 6.25%
Catalin Marinas 15 2.57% 1 6.25%
Hong Zhi Guo 12 2.06% 1 6.25%
Glauber de Oliveira Costa 10 1.72% 2 12.50%
Wang Xiaoqiang 5 0.86% 1 6.25%
Ralph Wuerthner 5 0.86% 1 6.25%
Alexander Kuleshov 3 0.51% 1 6.25%
Christoph Hellwig 2 0.34% 1 6.25%
Joe Perches 1 0.17% 1 6.25%
Geliang Tang 1 0.17% 1 6.25%
Pintu Kumar 1 0.17% 1 6.25%
Johannes Weiner 1 0.17% 1 6.25%
Total 583 100.00% 16 100.00%



int register_vmap_purge_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&vmap_notify_list, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
Chris Wilson 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(register_vmap_purge_notifier);



int unregister_vmap_purge_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&vmap_notify_list, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
Chris Wilson 19 100.00% 1 100.00%
Total 19 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(unregister_vmap_purge_notifier);



static void __free_vmap_area(struct vmap_area *va)
{
	BUG_ON(RB_EMPTY_NODE(&va->rb_node));

	if (free_vmap_cache) {
		if (va->va_end < cached_vstart) {
			free_vmap_cache = NULL;
		} else {
			struct vmap_area *cache;
			cache = rb_entry(free_vmap_cache, struct vmap_area, rb_node);
			if (va->va_start <= cache->va_start) {
				free_vmap_cache = rb_prev(&va->rb_node);
				/*
                                 * We don't try to update cached_hole_size or
                                 * cached_align, but it won't go very wrong.
                                 */
			}
		}
	}
	rb_erase(&va->rb_node, &vmap_area_root);
	RB_CLEAR_NODE(&va->rb_node);
	list_del_rcu(&va->list);

	/*
         * Track the highest possible candidate for pcpu area
         * allocation.  Areas outside of vmalloc area can be returned
         * here too, consider only end addresses which fall inside
         * vmalloc area proper.
         */
	if (va->va_end > VMALLOC_START && va->va_end <= VMALLOC_END)
		vmap_area_pcpu_hole = max(vmap_area_pcpu_hole, va->va_end);

	kfree_rcu(va, rcu_head);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 117 80.69% 2 50.00%
Tejun Heo 26 17.93% 1 25.00%
Lai Jiangshan 2 1.38% 1 25.00%
Total 145 100.00% 4 100.00%

/*
 * Free a region of KVA allocated by alloc_vmap_area
 */


static void free_vmap_area(struct vmap_area *va)
{
	spin_lock(&vmap_area_lock);
	__free_vmap_area(va);
	spin_unlock(&vmap_area_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 28 100.00% 1 100.00%
Total 28 100.00% 1 100.00%

/*
 * Clear the pagetable entries of a given vmap_area
 */


static void unmap_vmap_area(struct vmap_area *va)
{
	vunmap_page_range(va->va_start, va->va_end);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%



static void vmap_debug_free_range(unsigned long start, unsigned long end)
{
	/*
         * Unmap page tables and force a TLB flush immediately if pagealloc
         * debugging is enabled.  This catches use after free bugs similarly to
         * those in linear kernel virtual address space after a page has been
         * freed.
         *
         * All the lazy freeing logic is still retained, in order to minimise
         * intrusiveness of this debugging feature.
         *
         * This is going to be *slow* (linear kernel virtual address debugging
         * doesn't do a broadcast TLB flush so it is a lot faster).
         */
	if (debug_pagealloc_enabled()) {
		vunmap_page_range(start, end);
		flush_tlb_kernel_range(start, end);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 28 77.78% 1 50.00%
JoonSoo Kim 8 22.22% 1 50.00%
Total 36 100.00% 2 100.00%

/*
 * lazy_max_pages is the maximum amount of virtual address space we gather up
 * before attempting to purge with a TLB flush.
 *
 * There is a tradeoff here: a larger number will cover more kernel page tables
 * and take slightly longer to purge, but it will linearly reduce the number of
 * global TLB flushes that must be performed. It would seem natural to scale
 * this number up linearly with the number of CPUs (because vmapping activity
 * could also scale linearly with the number of CPUs), however it is likely
 * that in practice, workloads might be constrained in other ways that mean
 * vmap activity will not scale linearly with CPUs. Also, I want to be
 * conservative and not introduce a big latency on huge systems, so go with
 * a less aggressive log scale. It will still be an improvement over the old
 * code, and it will be simple to change the scale factor if we find that it
 * becomes a problem on bigger systems.
 */


static unsigned long lazy_max_pages(void)
{
	unsigned int log;

	log = fls(num_online_cpus());

	return log * (32UL * 1024 * 1024 / PAGE_SIZE);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%


static atomic_t vmap_lazy_nr = ATOMIC_INIT(0);

/*
 * Serialize vmap purging.  There is no actual criticial section protected
 * by this look, but we want to avoid concurrent calls for performance
 * reasons and to make the pcpu_get_vm_areas more deterministic.
 */
static DEFINE_MUTEX(vmap_purge_lock);

/* for per-CPU blocks */
static void purge_fragmented_blocks_allcpus(void);

/*
 * called before a call to iounmap() if the caller wants vm_area_struct's
 * immediately freed.
 */


void set_iounmap_nonlazy(void)
{
	atomic_set(&vmap_lazy_nr, lazy_max_pages()+1);
}

Contributors
Person Tokens Prop Commits CommitProp
Cliff Wickman 18 100.00% 1 100.00%
Total 18 100.00% 1 100.00%

/*
 * Purges all lazily-freed vmap areas.
 */


static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
{
	struct llist_node *valist;
	struct vmap_area *va;
	struct vmap_area *n_va;
	bool do_free = false;

	lockdep_assert_held(&vmap_purge_lock);

	valist = llist_del_all(&vmap_purge_list);
	llist_for_each_entry(va, valist, purge_list) {
		if (va->va_start < start)
			start = va->va_start;
		if (va->va_end > end)
			end = va->va_end;
		do_free = true;
	}

	if (!do_free)
		return false;

	flush_tlb_kernel_range(start, end);

	spin_lock(&vmap_area_lock);
	llist_for_each_entry_safe(va, n_va, valist, purge_list) {
		int nr = (va->va_end - va->va_start) >> PAGE_SHIFT;

		__free_vmap_area(va);
		atomic_sub(nr, &vmap_lazy_nr);
		cond_resched_lock(&vmap_area_lock);
	}
	spin_unlock(&vmap_area_lock);
	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 95 57.23% 1 20.00%
Joel Fernandes 38 22.89% 1 20.00%
Chris Wilson 16 9.64% 1 20.00%
Christoph Hellwig 10 6.02% 1 20.00%
Vegard Nossum 7 4.22% 1 20.00%
Total 166 100.00% 5 100.00%

/*
 * Kick off a purge of the outstanding lazy areas. Don't bother if somebody
 * is already purging.
 */


static void try_purge_vmap_area_lazy(void)
{
	if (mutex_trylock(&vmap_purge_lock)) {
		__purge_vmap_area_lazy(ULONG_MAX, 0);
		mutex_unlock(&vmap_purge_lock);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 17 54.84% 2 66.67%
Nicholas Piggin 14 45.16% 1 33.33%
Total 31 100.00% 3 100.00%

/*
 * Kick off a purge of the outstanding lazy areas.
 */


static void purge_vmap_area_lazy(void)
{
	mutex_lock(&vmap_purge_lock);
	purge_fragmented_blocks_allcpus();
	__purge_vmap_area_lazy(ULONG_MAX, 0);
	mutex_unlock(&vmap_purge_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 16 53.33% 2 66.67%
Nicholas Piggin 14 46.67% 1 33.33%
Total 30 100.00% 3 100.00%

/*
 * Free a vmap area, caller ensuring that the area has been unmapped
 * and flush_cache_vunmap had been called for the correct range
 * previously.
 */


static void free_vmap_area_noflush(struct vmap_area *va)
{
	int nr_lazy;

	nr_lazy = atomic_add_return((va->va_end - va->va_start) >> PAGE_SHIFT,
				    &vmap_lazy_nr);

	/* After this point, we may free va at any time */
	llist_add(&va->purge_list, &vmap_purge_list);

	if (unlikely(nr_lazy > lazy_max_pages()))
		try_purge_vmap_area_lazy();
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 39 66.10% 2 50.00%
Chris Wilson 19 32.20% 1 25.00%
Jeremy Fitzhardinge 1 1.69% 1 25.00%
Total 59 100.00% 4 100.00%

/*
 * Free and unmap a vmap area
 */


static void free_unmap_vmap_area(struct vmap_area *va)
{
	flush_cache_vunmap(va->va_start, va->va_end);
	unmap_vmap_area(va);
	free_vmap_area_noflush(va);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 26 81.25% 1 50.00%
Christoph Hellwig 6 18.75% 1 50.00%
Total 32 100.00% 2 100.00%



static struct vmap_area *find_vmap_area(unsigned long addr)
{
	struct vmap_area *va;

	spin_lock(&vmap_area_lock);
	va = __find_vmap_area(addr);
	spin_unlock(&vmap_area_lock);

	return va;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 39 100.00% 1 100.00%
Total 39 100.00% 1 100.00%

/*** Per cpu kva allocator ***/

/*
 * vmap space is limited especially on 32 bit architectures. Ensure there is
 * room for at least 16 percpu vmap blocks per CPU.
 */
/*
 * If we had a constant VMALLOC_START and VMALLOC_END, we'd like to be able
 * to #define VMALLOC_SPACE             (VMALLOC_END-VMALLOC_START). Guess
 * instead (we just need a rough idea)
 */
#if BITS_PER_LONG == 32

#define VMALLOC_SPACE		(128UL*1024*1024)
#else

#define VMALLOC_SPACE		(128UL*1024*1024*1024)
#endif


#define VMALLOC_PAGES		(VMALLOC_SPACE / PAGE_SIZE)

#define VMAP_MAX_ALLOC		BITS_PER_LONG	
/* 256K with 4K pages */

#define VMAP_BBMAP_BITS_MAX	1024	
/* 4MB with 4K pages */

#define VMAP_BBMAP_BITS_MIN	(VMAP_MAX_ALLOC*2)

#define VMAP_MIN(x, y)		((x) < (y) ? (x) : (y)) 
/* can't use min() */

#define VMAP_MAX(x, y)		((x) > (y) ? (x) : (y)) 
/* can't use max() */

#define VMAP_BBMAP_BITS		\
		VMAP_MIN(VMAP_BBMAP_BITS_MAX,   \
                VMAP_MAX(VMAP_BBMAP_BITS_MIN,   \
                        VMALLOC_PAGES / roundup_pow_of_two(NR_CPUS) / 16))


#define VMAP_BLOCK_SIZE		(VMAP_BBMAP_BITS * PAGE_SIZE)


static bool vmap_initialized __read_mostly = false;


struct vmap_block_queue {
	
spinlock_t lock;
	
struct list_head free;
};


struct vmap_block {
	
spinlock_t lock;
	
struct vmap_area *va;
	

unsigned long free, dirty;
	

unsigned long dirty_min, dirty_max; /*< dirty range */
	
struct list_head free_list;
	
struct rcu_head rcu_head;
	
struct list_head purge;
};

/* Queue of free and dirty vmap blocks, for allocation and flushing purposes */
static DEFINE_PER_CPU(struct vmap_block_queue, vmap_block_queue);

/*
 * Radix tree of vmap blocks, indexed by address, to quickly find a vmap block
 * in the free path. Could get rid of this if we change the API to return a
 * "cookie" from alloc, to be passed to free. But no big deal yet.
 */
static DEFINE_SPINLOCK(vmap_block_tree_lock);
static RADIX_TREE(vmap_block_tree, GFP_ATOMIC);

/*
 * We should probably have a fallback mechanism to allocate virtual memory
 * out of partially filled vmap blocks. However vmap block sizing should be
 * fairly reasonable according to the vmalloc size, so it shouldn't be a
 * big problem.
 */



static unsigned long addr_to_vb_idx(unsigned long addr)
{
	addr -= VMALLOC_START & ~(VMAP_BLOCK_SIZE-1);
	addr /= VMAP_BLOCK_SIZE;
	return addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 29 100.00% 1 100.00%
Total 29 100.00% 1 100.00%



static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off)
{
	unsigned long addr;

	addr = va_start + (pages_off << PAGE_SHIFT);
	BUG_ON(addr_to_vb_idx(addr) != addr_to_vb_idx(va_start));
	return (void *)addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Roman Peniaev 49 100.00% 1 100.00%
Total 49 100.00% 1 100.00%

/**
 * new_vmap_block - allocates new vmap_block and occupies 2^order pages in this
 *                  block. Of course pages number can't exceed VMAP_BBMAP_BITS
 * @order:    how many 2^order pages should be occupied in newly allocated block
 * @gfp_mask: flags for the page level allocator
 *
 * Returns: virtual address in a newly allocated block or ERR_PTR(-errno)
 */


static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
{
	struct vmap_block_queue *vbq;
	struct vmap_block *vb;
	struct vmap_area *va;
	unsigned long vb_idx;
	int node, err;
	void *vaddr;

	node = numa_node_id();

	vb = kmalloc_node(sizeof(struct vmap_block),
			gfp_mask & GFP_RECLAIM_MASK, node);
	if (unlikely(!vb))
		return ERR_PTR(-ENOMEM);

	va = alloc_vmap_area(VMAP_BLOCK_SIZE, VMAP_BLOCK_SIZE,
					VMALLOC_START, VMALLOC_END,
					node, gfp_mask);
	if (IS_ERR(va)) {
		kfree(vb);
		return ERR_CAST(va);
	}

	err = radix_tree_preload(gfp_mask);
	if (unlikely(err)) {
		kfree(vb);
		free_vmap_area(va);
		return ERR_PTR(err);
	}

	vaddr = vmap_block_vaddr(va->va_start, 0);
	spin_lock_init(&vb->lock);
	vb->va = va;
	/* At least something should be left free */
	BUG_ON(VMAP_BBMAP_BITS <= (1UL << order));
	vb->free = VMAP_BBMAP_BITS - (1UL << order);
	vb->dirty = 0;
	vb->dirty_min = VMAP_BBMAP_BITS;
	vb->dirty_max = 0;
	INIT_LIST_HEAD(&vb->free_list);

	vb_idx = addr_to_vb_idx(va->va_start);
	spin_lock(&vmap_block_tree_lock);
	err = radix_tree_insert(&vmap_block_tree, vb_idx, vb);
	spin_unlock(&vmap_block_tree_lock);
	BUG_ON(err);
	radix_tree_preload_end();

	vbq = &get_cpu_var(vmap_block_queue);
	spin_lock(&vbq->lock);
	list_add_tail_rcu(&vb->free_list, &vbq->free);
	spin_unlock(&vbq->lock);
	put_cpu_var(vmap_block_queue);

	return vaddr;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 259 83.82% 1 16.67%
Roman Peniaev 48 15.53% 3 50.00%
Tejun Heo 1 0.32% 1 16.67%
Julia Lawall 1 0.32% 1 16.67%
Total 309 100.00% 6 100.00%



static void free_vmap_block(struct vmap_block *vb)
{
	struct vmap_block *tmp;
	unsigned long vb_idx;

	vb_idx = addr_to_vb_idx(vb->va->va_start);
	spin_lock(&vmap_block_tree_lock);
	tmp = radix_tree_delete(&vmap_block_tree, vb_idx);
	spin_unlock(&vmap_block_tree_lock);
	BUG_ON(tmp != vb);

	free_vmap_area_noflush(vb->va);
	kfree_rcu(vb, rcu_head);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 71 95.95% 1 33.33%
Lai Jiangshan 2 2.70% 1 33.33%
Jeremy Fitzhardinge 1 1.35% 1 33.33%
Total 74 100.00% 3 100.00%



static void purge_fragmented_blocks(int cpu)
{
	LIST_HEAD(purge);
	struct vmap_block *vb;
	struct vmap_block *n_vb;
	struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);

	rcu_read_lock();
	list_for_each_entry_rcu(vb, &vbq->free, free_list) {

		if (!(vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS))
			continue;

		spin_lock(&vb->lock);
		if (vb->free + vb->dirty == VMAP_BBMAP_BITS && vb->dirty != VMAP_BBMAP_BITS) {
			vb->free = 0; /* prevent further allocs after releasing lock */
			vb->dirty = VMAP_BBMAP_BITS; /* prevent purging it again */
			vb->dirty_min = 0;
			vb->dirty_max = VMAP_BBMAP_BITS;
			spin_lock(&vbq->lock);
			list_del_rcu(&vb->free_list);
			spin_unlock(&vbq->lock);
			spin_unlock(&vb->lock);
			list_add_tail(&vb->purge, &purge);
		} else
			spin_unlock(&vb->lock);
	}
	rcu_read_unlock();

	list_for_each_entry_safe(vb, n_vb, &purge, purge) {
		list_del(&vb->purge);
		free_vmap_block(vb);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 198 96.12% 1 50.00%
Roman Peniaev 8 3.88% 1 50.00%
Total 206 100.00% 2 100.00%



static void purge_fragmented_blocks_allcpus(void)
{
	int cpu;

	for_each_possible_cpu(cpu)
		purge_fragmented_blocks(cpu);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 20 100.00% 1 100.00%
Total 20 100.00% 1 100.00%



static void *vb_alloc(unsigned long size, gfp_t gfp_mask)
{
	struct vmap_block_queue *vbq;
	struct vmap_block *vb;
	void *vaddr = NULL;
	unsigned int order;

	BUG_ON(offset_in_page(size));
	BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);
	if (WARN_ON(size == 0)) {
		/*
                 * Allocating 0 bytes isn't what caller wants since
                 * get_order(0) returns funny result. Just warn and terminate
                 * early.
                 */
		return NULL;
	}
	order = get_order(size);

	rcu_read_lock();
	vbq = &get_cpu_var(vmap_block_queue);
	list_for_each_entry_rcu(vb, &vbq->free, free_list) {
		unsigned long pages_off;

		spin_lock(&vb->lock);
		if (vb->free < (1UL << order)) {
			spin_unlock(&vb->lock);
			continue;
		}

		pages_off = VMAP_BBMAP_BITS - vb->free;
		vaddr = vmap_block_vaddr(vb->va->va_start, pages_off);
		vb->free -= 1UL << order;
		if (vb->free == 0) {
			spin_lock(&vbq->lock);
			list_del_rcu(&vb->free_list);
			spin_unlock(&vbq->lock);
		}

		spin_unlock(&vb->lock);
		break;
	}

	put_cpu_var(vmap_block_queue);
	rcu_read_unlock();

	/* Allocate new block if nothing was found */
	if (!vaddr)
		vaddr = new_vmap_block(order, gfp_mask);

	return vaddr;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 176 77.53% 3 37.50%
Roman Peniaev 31 13.66% 1 12.50%
Jan Kara 15 6.61% 1 12.50%
Alexander Kuleshov 3 1.32% 1 12.50%
Zhang Yanfei 1 0.44% 1 12.50%
Tejun Heo 1 0.44% 1 12.50%
Total 227 100.00% 8 100.00%



static void vb_free(const void *addr, unsigned long size)
{
	unsigned long offset;
	unsigned long vb_idx;
	unsigned int order;
	struct vmap_block *vb;

	BUG_ON(offset_in_page(size));
	BUG_ON(size > PAGE_SIZE*VMAP_MAX_ALLOC);

	flush_cache_vunmap((unsigned long)addr, (unsigned long)addr + size);

	order = get_order(size);

	offset = (unsigned long)addr & (VMAP_BLOCK_SIZE - 1);
	offset >>= PAGE_SHIFT;

	vb_idx = addr_to_vb_idx((unsigned long)addr);
	rcu_read_lock();
	vb = radix_tree_lookup(&vmap_block_tree, vb_idx);
	rcu_read_unlock();
	BUG_ON(!vb);

	vunmap_page_range((unsigned long)addr, (unsigned long)addr + size);

	spin_lock(&vb->lock);

	/* Expand dirty range */
	vb->dirty_min = min(vb->dirty_min, offset);
	vb->dirty_max = max(vb->dirty_max, offset + (1UL << order));

	vb->dirty += 1UL << order;
	if (vb->dirty == VMAP_BBMAP_BITS) {
		BUG_ON(vb->free);
		spin_unlock(&vb->lock);
		free_vmap_block(vb);
	} else
		spin_unlock(&vb->lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 181 79.04% 3 50.00%
Roman Peniaev 28 12.23% 1 16.67%
Jeremy Fitzhardinge 17 7.42% 1 16.67%
Alexander Kuleshov 3 1.31% 1 16.67%
Total 229 100.00% 6 100.00%

/**
 * vm_unmap_aliases - unmap outstanding lazy aliases in the vmap layer
 *
 * The vmap/vmalloc layer lazily flushes kernel virtual mappings primarily
 * to amortize TLB flushing overheads. What this means is that any page you
 * have now, may, in a former life, have been mapped into kernel virtual
 * address by the vmap layer and so there might be some CPUs with TLB entries
 * still referencing that page (additional to the regular 1:1 kernel mapping).
 *
 * vm_unmap_aliases flushes all such lazy mappings. After it returns, we can
 * be sure that none of the pages we have control over will have any aliases
 * from the vmap layer.
 */


void vm_unmap_aliases(void)
{
	unsigned long start = ULONG_MAX, end = 0;
	int cpu;
	int flush = 0;

	if (unlikely(!vmap_initialized))
		return;

	might_sleep();

	for_each_possible_cpu(cpu) {
		struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
		struct vmap_block *vb;

		rcu_read_lock();
		list_for_each_entry_rcu(vb, &vbq->free, free_list) {
			spin_lock(&vb->lock);
			if (vb->dirty) {
				unsigned long va_start = vb->va->va_start;
				unsigned long s, e;

				s = va_start + (vb->dirty_min << PAGE_SHIFT);
				e = va_start + (vb->dirty_max << PAGE_SHIFT);

				start = min(s, start);
				end   = max(e, end);

				flush = 1;
			}
			spin_unlock(&vb->lock);
		}
		rcu_read_unlock();
	}

	mutex_lock(&vmap_purge_lock);
	purge_fragmented_blocks_allcpus();
	if (!__purge_vmap_area_lazy(start, end) && flush)
		flush_tlb_kernel_range(start, end);
	mutex_unlock(&vmap_purge_lock);
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 125 63.45% 1 14.29%
Roman Peniaev 33 16.75% 1 14.29%
Christoph Hellwig 29 14.72% 3 42.86%
Jeremy Fitzhardinge 9 4.57% 1 14.29%
JoonSoo Kim 1 0.51% 1 14.29%
Total 197 100.00% 7 100.00%


EXPORT_SYMBOL_GPL(vm_unmap_aliases);

/**
 * vm_unmap_ram - unmap linear kernel address space set up by vm_map_ram
 * @mem: the pointer returned by vm_map_ram
 * @count: the count passed to that vm_map_ram call (cannot unmap partial)
 */


void vm_unmap_ram(const void *mem, unsigned int count)
{
	unsigned long size = (unsigned long)count << PAGE_SHIFT;
	unsigned long addr = (unsigned long)mem;
	struct vmap_area *va;

	might_sleep();
	BUG_ON(!addr);
	BUG_ON(addr < VMALLOC_START);
	BUG_ON(addr > VMALLOC_END);
	BUG_ON(!PAGE_ALIGNED(addr));

	debug_check_no_locks_freed(mem, size);
	vmap_debug_free_range(addr, addr+size);

	if (likely(count <= VMAP_MAX_ALLOC)) {
		vb_free(mem, size);
		return;
	}

	va = find_vmap_area(addr);
	BUG_ON(!va);
	free_unmap_vmap_area(va);
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 93 73.81% 2 28.57%
Christoph Hellwig 25 19.84% 2 28.57%
Guillermo Julián Moreno 4 3.17% 1 14.29%
Wang Xiaoqiang 3 2.38% 1 14.29%
Shawn Lin 1 0.79% 1 14.29%
Total 126 100.00% 7 100.00%


EXPORT_SYMBOL(vm_unmap_ram);

/**
 * vm_map_ram - map pages linearly into kernel virtual address (vmalloc space)
 * @pages: an array of pointers to the pages to be mapped
 * @count: number of pages
 * @node: prefer to allocate data structures on this node
 * @prot: memory protection to use. PAGE_KERNEL for regular RAM
 *
 * If you use this function for less than VMAP_MAX_ALLOC pages, it could be
 * faster than vmap so it's good.  But if you mix long-life and short-life
 * objects with vm_map_ram(), it could consume lots of address space through
 * fragmentation (especially on a 32bit machine).  You could see failures in
 * the end.  Please use this function for short-lived objects.
 *
 * Returns: a pointer to the address that has been mapped, or %NULL on failure
 */


void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot)
{
	unsigned long size = (unsigned long)count << PAGE_SHIFT;
	unsigned long addr;
	void *mem;

	if (likely(count <= VMAP_MAX_ALLOC)) {
		mem = vb_alloc(size, GFP_KERNEL);
		if (IS_ERR(mem))
			return NULL;
		addr = (unsigned long)mem;
	} else {
		struct vmap_area *va;
		va = alloc_vmap_area(size, PAGE_SIZE,
				VMALLOC_START, VMALLOC_END, node, GFP_KERNEL);
		if (IS_ERR(va))
			return NULL;

		addr = va->va_start;
		mem = (void *)addr;
	}
	if (vmap_page_range(addr, addr + size, prot, pages) < 0) {
		vm_unmap_ram(mem, count);
		return NULL;
	}
	return mem;
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 156 96.89% 1 33.33%
Guillermo Julián Moreno 4 2.48% 1 33.33%
Mika Kukkonen 1 0.62% 1 33.33%
Total 161 100.00% 3 100.00%


EXPORT_SYMBOL(vm_map_ram);


static struct vm_struct *vmlist __initdata;
/**
 * vm_area_add_early - add vmap area early during boot
 * @vm: vm_struct to add
 *
 * This function is used to add fixed kernel vm area to vmlist before
 * vmalloc_init() is called.  @vm->addr, @vm->size, and @vm->flags
 * should contain proper values and the other fields should be zero.
 *
 * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
 */


void __init vm_area_add_early(struct vm_struct *vm)
{
	struct vm_struct *tmp, **p;

	BUG_ON(vmap_initialized);
	for (p = &vmlist; (tmp = *p) != NULL; p = &tmp->next) {
		if (tmp->addr >= vm->addr) {
			BUG_ON(tmp->addr < vm->addr + vm->size);
			break;
		} else
			BUG_ON(tmp->addr + tmp->size > vm->addr);
	}
	vm->next = *p;
	*p = vm;
}

Contributors
Person Tokens Prop Commits CommitProp
Nico Pitre 106 100.00% 1 100.00%
Total 106 100.00% 1 100.00%

/**
 * vm_area_register_early - register vmap area early during boot
 * @vm: vm_struct to register
 * @align: requested alignment
 *
 * This function is used to register kernel vm area before
 * vmalloc_init() is called.  @vm->size and @vm->flags should contain
 * proper values on entry and other fields should be zero.  On return,
 * vm->addr contains the allocated address.
 *
 * DO NOT USE THIS FUNCTION UNLESS YOU KNOW WHAT YOU'RE DOING.
 */


void __init vm_area_register_early(struct vm_struct *vm, size_t align)
{
	static size_t vm_init_off __initdata;
	unsigned long addr;

	addr = ALIGN(VMALLOC_START + vm_init_off, align);
	vm_init_off = PFN_ALIGN(addr + vm->size) - VMALLOC_START;

	vm->addr = (void *)addr;

	vm_area_add_early(vm);
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 59 95.16% 2 66.67%
Nico Pitre 3 4.84% 1 33.33%
Total 62 100.00% 3 100.00%



void __init vmalloc_init(void)
{
	struct vmap_area *va;
	struct vm_struct *tmp;
	int i;

	for_each_possible_cpu(i) {
		struct vmap_block_queue *vbq;
		struct vfree_deferred *p;

		vbq = &per_cpu(vmap_block_queue, i);
		spin_lock_init(&vbq->lock);
		INIT_LIST_HEAD(&vbq->free);
		p = &per_cpu(vfree_deferred, i);
		init_llist_head(&p->list);
		INIT_WORK(&p->wq, free_work);
	}

	/* Import existing vmlist entries. */
	for (tmp = vmlist; tmp; tmp = tmp->next) {
		va = kzalloc(sizeof(struct vmap_area), GFP_NOWAIT);
		va->flags = VM_VM_AREA;
		va->va_start = (unsigned long)tmp->addr;
		va->va_end = va->va_start + tmp->size;
		va->vm = tmp;
		__insert_vmap_area(va);
	}

	vmap_area_pcpu_hole = VMALLOC_END;

	vmap_initialized = true;
}

Contributors
Person Tokens Prop Commits CommitProp
Ivan Kokshaysky 72 42.35% 1 12.50%
Nicholas Piggin 45 26.47% 1 12.50%
Al Viro 33 19.41% 1 12.50%
Cho KyongHo 6 3.53% 1 12.50%
Jeremy Fitzhardinge 4 2.35% 1 12.50%
Tejun Heo 4 2.35% 1 12.50%
Linus Torvalds (pre-git) 3 1.76% 1 12.50%
Pekka J Enberg 3 1.76% 1 12.50%
Total 170 100.00% 8 100.00%

/**
 * map_kernel_range_noflush - map kernel VM area with the specified pages
 * @addr: start of the VM area to map
 * @size: size of the VM area to map
 * @prot: page protection flags to use
 * @pages: pages to map
 *
 * Map PFN_UP(@size) pages at @addr.  The VM area @addr and @size
 * specify should have been allocated using get_vm_area() and its
 * friends.
 *
 * NOTE:
 * This function does NOT do any cache flushing.  The caller is
 * responsible for calling flush_cache_vmap() on to-be-mapped areas
 * before calling this function.
 *
 * RETURNS:
 * The number of pages mapped on success, -errno on failure.
 */


int map_kernel_range_noflush(unsigned long addr, unsigned long size,
			     pgprot_t prot, struct page **pages)
{
	return vmap_page_range_noflush(addr, addr + size, prot, pages);
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%

/**
 * unmap_kernel_range_noflush - unmap kernel VM area
 * @addr: start of the VM area to unmap
 * @size: size of the VM area to unmap
 *
 * Unmap PFN_UP(@size) pages at @addr.  The VM area @addr and @size
 * specify should have been allocated using get_vm_area() and its
 * friends.
 *
 * NOTE:
 * This function does NOT do any cache flushing.  The caller is
 * responsible for calling flush_cache_vunmap() on to-be-mapped areas
 * before calling this function and flush_tlb_kernel_range() after.
 */


void unmap_kernel_range_noflush(unsigned long addr, unsigned long size)
{
	vunmap_page_range(addr, addr + size);
}
Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 22 100.00% 1 100.00%
Total 22 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(unmap_kernel_range_noflush);

/**
 * unmap_kernel_range - unmap kernel VM area and flush cache and TLB
 * @addr: start of the VM area to unmap
 * @size: size of the VM area to unmap
 *
 * Similar to unmap_kernel_range_noflush() but flushes vcache before
 * the unmapping and tlb after.
 */


void unmap_kernel_range(unsigned long addr, unsigned long size)
{
	unsigned long end = addr + size;

	flush_cache_vunmap(addr, end);
	vunmap_page_range(addr, end);
	flush_tlb_kernel_range(addr, end);
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 30 71.43% 1 25.00%
Tejun Heo 7 16.67% 1 25.00%
Russell King 4 9.52% 1 25.00%
Linus Torvalds (pre-git) 1 2.38% 1 25.00%
Total 42 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(unmap_kernel_range);



int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
{
	unsigned long addr = (unsigned long)area->addr;
	unsigned long end = addr + get_vm_area_size(area);
	int err;

	err = vmap_page_range(addr, end, prot, pages);

	return err > 0 ? 0 : err;
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 52 77.61% 1 25.00%
James Bottomley 9 13.43% 1 25.00%
Wanpeng Li 3 4.48% 1 25.00%
WANG Chao 3 4.48% 1 25.00%
Total 67 100.00% 4 100.00%


EXPORT_SYMBOL_GPL(map_vm_area);



static void setup_vmalloc_vm(struct vm_struct *vm, struct vmap_area *va,
			      unsigned long flags, const void *caller)
{
	spin_lock(&vmap_area_lock);
	vm->flags = flags;
	vm->addr = (void *)va->va_start;
	vm->size = va->va_end - va->va_start;
	vm->caller = caller;
	va->vm = vm;
	va->flags |= VM_VM_AREA;
	spin_unlock(&vmap_area_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 69 81.18% 1 20.00%
JoonSoo Kim 12 14.12% 1 20.00%
Mitsuo Hayasaka 2 2.35% 1 20.00%
Marek Szyprowski 1 1.18% 1 20.00%
MinChan Kim 1 1.18% 1 20.00%
Total 85 100.00% 5 100.00%



static void clear_vm_uninitialized_flag(struct vm_struct *vm)
{
	/*
         * Before removing VM_UNINITIALIZED,
         * we should make sure that vm has proper values.
         * Pair with smp_rmb() in show_numa_info().
         */
	smp_wmb();
	vm->flags &= ~VM_UNINITIALIZED;
}

Contributors
Person Tokens Prop Commits CommitProp
Mitsuo Hayasaka 15 68.18% 1 25.00%
JoonSoo Kim 3 13.64% 1 25.00%
Zhang Yanfei 3 13.64% 1 25.00%
Tejun Heo 1 4.55% 1 25.00%
Total 22 100.00% 4 100.00%



static struct vm_struct *__get_vm_area_node(unsigned long size,
		unsigned long align, unsigned long flags, unsigned long start,
		unsigned long end, int node, gfp_t gfp_mask, const void *caller)
{
	struct vmap_area *va;
	struct vm_struct *area;

	BUG_ON(in_interrupt());
	size = PAGE_ALIGN(size);
	if (unlikely(!size))
		return NULL;

	if (flags & VM_IOREMAP)
		align = 1ul << clamp_t(int, get_count_order_long(size),
				       PAGE_SHIFT, IOREMAP_MAX_ORDER);

	area = kzalloc_node(sizeof(*area), gfp_mask & GFP_RECLAIM_MASK, node);
	if (unlikely(!area))
		return NULL;

	if (!(flags & VM_NO_GUARD))
		size += PAGE_SIZE;

	va = alloc_vmap_area(size, align, start, end, node, gfp_mask);
	if (IS_ERR(va)) {
		kfree(area);
		return NULL;
	}

	setup_vmalloc_vm(area, va, flags, caller);

	return area;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 108 58.06% 1 5.88%
zijun_hu 19 10.22% 1 5.88%
Mitsuo Hayasaka 11 5.91% 1 5.88%
Zhang Yanfei 9 4.84% 1 5.88%
Andrey Ryabinin 9 4.84% 1 5.88%
James Bottomley 7 3.76% 2 11.76%
Linus Torvalds (pre-git) 6 3.23% 3 17.65%
Christoph Hellwig 4 2.15% 1 5.88%
David S. Miller 4 2.15% 1 5.88%
Toshi Kani 3 1.61% 1 5.88%
Linus Torvalds 2 1.08% 1 5.88%
Andi Kleen 2 1.08% 1 5.88%
Marek Szyprowski 1 0.54% 1 5.88%
Tejun Heo 1 0.54% 1 5.88%
Total 186 100.00% 17 100.00%



struct vm_struct *__get_vm_area(unsigned long size, unsigned long flags,
				unsigned long start, unsigned long end)
{
	return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE,
				  GFP_KERNEL, __builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 41 89.13% 2 40.00%
David S. Miller 2 4.35% 1 20.00%
Giridhar Pemmasani 2 4.35% 1 20.00%
David Rientjes 1 2.17% 1 20.00%
Total 46 100.00% 5 100.00%


EXPORT_SYMBOL_GPL(__get_vm_area);



struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
				       unsigned long start, unsigned long end,
				       const void *caller)
{
	return __get_vm_area_node(size, 1, flags, start, end, NUMA_NO_NODE,
				  GFP_KERNEL, caller);
}

Contributors
Person Tokens Prop Commits CommitProp
Benjamin Herrenschmidt 44 91.67% 1 25.00%
David S. Miller 2 4.17% 1 25.00%
Marek Szyprowski 1 2.08% 1 25.00%
David Rientjes 1 2.08% 1 25.00%
Total 48 100.00% 4 100.00%

/**
 *      get_vm_area  -  reserve a contiguous kernel virtual area
 *      @size:          size of the area
 *      @flags:         %VM_IOREMAP for I/O mappings or VM_ALLOC
 *
 *      Search an area of @size in the kernel virtual mapping area,
 *      and reserved it for out purposes.  Returns the area descriptor
 *      on success or %NULL on failure.
 */


struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
{
	return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
				  NUMA_NO_NODE, GFP_KERNEL,
				  __builtin_return_address(0));
}

Contributors
Person Tokens Prop Commits CommitProp
Russell King 23 60.53% 1 25.00%
Christoph Lameter 12 31.58% 1 25.00%
David S. Miller 2 5.26% 1 25.00%
David Rientjes 1 2.63% 1 25.00%
Total 38 100.00% 4 100.00%



struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
				const void *caller)
{
	return __get_vm_area_node(size, 1, flags, VMALLOC_START, VMALLOC_END,
				  NUMA_NO_NODE, GFP_KERNEL, caller);
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 33 82.50% 1 20.00%
Russell King 3 7.50% 1 20.00%
David S. Miller 2 5.00% 1 20.00%
David Rientjes 1 2.50% 1 20.00%
Marek Szyprowski 1 2.50% 1 20.00%
Total 40 100.00% 5 100.00%

/**
 *      find_vm_area  -  find a continuous kernel virtual area
 *      @addr:          base address
 *
 *      Search for the kernel VM area starting at @addr, and return it.
 *      It is up to the caller to do all required locking to keep the returned
 *      pointer valid.
 */


struct vm_struct *find_vm_area(const void *addr)
{
	struct vmap_area *va;

	va = find_vmap_area((unsigned long)addr);
	if (va && va->flags & VM_VM_AREA)
		return va->vm;

	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 44 95.65% 2 50.00%
Christoph Lameter 1 2.17% 1 25.00%
MinChan Kim 1 2.17% 1 25.00%
Total 46 100.00% 4 100.00%

/**
 *      remove_vm_area  -  find and remove a continuous kernel virtual area
 *      @addr:          base address
 *
 *      Search for the kernel VM area starting at @addr, and remove it.
 *      This function returns the found VM area, but using it is NOT safe
 *      on SMP machines, except for its size or flags.
 */


struct vm_struct *remove_vm_area(const void *addr)
{
	struct vmap_area *va;

	might_sleep();

	va = find_vmap_area((unsigned long)addr);
	if (va && va->flags & VM_VM_AREA) {
		struct vm_struct *vm = va->vm;

		spin_lock(&vmap_area_lock);
		va->vm = NULL;
		va->flags &= ~VM_VM_AREA;
		spin_unlock(&vmap_area_lock);

		vmap_debug_free_range(va->va_start, va->va_end);
		kasan_free_shadow(vm);
		free_unmap_vmap_area(va);

		return vm;
	}
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 38 36.54% 1 10.00%
JoonSoo Kim 25 24.04% 1 10.00%
Kamezawa Hiroyuki 16 15.38% 1 10.00%
Linus Torvalds (pre-git) 9 8.65% 1 10.00%
Andi Kleen 6 5.77% 2 20.00%
Andrey Ryabinin 5 4.81% 1 10.00%
Christoph Hellwig 3 2.88% 1 10.00%
Christoph Lameter 1 0.96% 1 10.00%
MinChan Kim 1 0.96% 1 10.00%
Total 104 100.00% 10 100.00%



static void __vunmap(const void *addr, int deallocate_pages)
{
	struct vm_struct *area;

	if (!addr)
		return;

	if (WARN(!PAGE_ALIGNED(addr), "Trying to vfree() bad address (%p)\n",
			addr))
		return;

	area = remove_vm_area(addr);
	if (unlikely(!area)) {
		WARN(1, KERN_ERR "Trying to vfree() nonexistent vm area (%p)\n",
				addr);
		return;
	}

	debug_check_no_locks_freed(addr, get_vm_area_size(area));
	debug_check_no_obj_freed(addr, get_vm_area_size(area));

	if (deallocate_pages) {
		int i;

		for (i = 0; i < area->nr_pages; i++) {
			struct page *page = area->pages[i];

			BUG_ON(!page);
			__free_pages(page, 0);
		}

		kvfree(area->pages);
	}

	kfree(area);
	return;
}

Contributors
Person Tokens Prop Commits CommitProp
Andrew Morton 32 20.92% 1 5.56%
Andi Kleen 32 20.92% 1 5.56%
Christoph Hellwig 31 20.26% 1 5.56%
Christoph Lameter 12 7.84% 2 11.11%
Linus Torvalds (pre-git) 10 6.54% 4 22.22%
Ingo Molnar 7 4.58% 1 5.56%
Thomas Gleixner 7 4.58% 1 5.56%
Daisuke Hatayama 6 3.92% 1 5.56%
Jerome Marchand 6 3.92% 1 5.56%
Arjan van de Ven 5 3.27% 1 5.56%
Vladimir Davydov 3 1.96% 2 11.11%
David Rientjes 1 0.65% 1 5.56%
Benjamin Herrenschmidt 1 0.65% 1 5.56%
Total 153 100.00% 18 100.00%



static inline void __vfree_deferred(const void *addr)
{
	/*
         * Use raw_cpu_ptr() because this can be called from preemptible
         * context. Preemption is absolutely fine here, because the llist_add()
         * implementation is lockless, so it works even if we are adding to
         * nother cpu's list.  schedule_work() should be fine with this too.
         */
	struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);

	if (llist_add((struct llist_node *)addr, &p->list))
		schedule_work(&p->wq);
}

Contributors
Person Tokens Prop Commits CommitProp
Al Viro 32 65.31% 1 14.29%
Andrey Ryabinin 5 10.20% 1 14.29%
Christoph Hellwig 5 10.20% 1 14.29%
Oleg Nesterov 3 6.12% 1 14.29%
Tom Rini 2 4.08% 1 14.29%
Christoph Lameter 2 4.08% 2 28.57%
Total 49 100.00% 7 100.00%

/**
 *      vfree_atomic  -  release memory allocated by vmalloc()
 *      @addr:          memory base address
 *
 *      This one is just like vfree() but can be called in any atomic context
 *      except NMIs.
 */


void vfree_atomic(const void *addr)
{
	BUG_ON(in_nmi());

	kmemleak_free(addr);

	if (!addr)
		return;
	__vfree_deferred(addr);
}

Contributors
Person Tokens Prop Commits CommitProp
Andrey Ryabinin 32 100.00% 1 100.00%
Total 32 100.00% 1 100.00%

/**
 *      vfree  -  release memory allocated by vmalloc()
 *      @addr:          memory base address
 *
 *      Free the virtually continuous memory area starting at @addr, as
 *      obtained from vmalloc(), vmalloc_32() or __vmalloc(). If @addr is
 *      NULL, no operation is performed.
 *
 *      Must not be called in NMI context (strictly speaking, only if we don't
 *      have CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG, but making the calling
 *      conventions for vfree() arch-depenedent would be a really bad idea)
 *
 *      NOTE: assumes that the object at *addr has a size >= sizeof(llist_node)
 */


void vfree(const void *addr)
{
	BUG_ON(in_nmi());

	kmemleak_free(addr);

	if (!addr)
		return;
	if (unlikely(in_interrupt()))
		__vfree_deferred(addr);
	else
		__vunmap(addr, 1);
}
Contributors
Person Tokens Prop Commits CommitProp
Andrey Ryabinin 39 81.25% 1 25.00%
Tom Rini 4 8.33% 1 25.00%
Christoph Hellwig 4 8.33% 1 25.00%
Al Viro 1 2.08% 1 25.00%
Total 48 100.00% 4 100.00%


EXPORT_SYMBOL(vfree);

/**
 *      vunmap  -  release virtual mapping obtained by vmap()
 *      @addr:          memory base address
 *
 *      Free the virtually contiguous memory area starting at @addr,
 *      which was created from the page array passed to vmap().
 *
 *      Must not be called in interrupt context.
 */


void vunmap(const void *addr)
{
	BUG_ON(in_interrupt());
	might_sleep();
	if (addr)
		__vunmap(addr, 0);
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 8 26.67% 1 16.67%
Tom Rini 8 26.67% 1 16.67%
Andrew Morton 6 20.00% 1 16.67%
Al Viro 4 13.33% 1 16.67%
Peter Zijlstra 3 10.00% 1 16.67%
Christoph Lameter 1 3.33% 1 16.67%
Total 30 100.00% 6 100.00%


EXPORT_SYMBOL(vunmap);

/**
 *      vmap  -  map an array of pages into virtually contiguous space
 *      @pages:         array of page pointers
 *      @count:         number of pages to map
 *      @flags:         vm_area->flags
 *      @prot:          page protection for the mapping
 *
 *      Maps @count pages from @pages into contiguous kernel virtual
 *      space.
 */


void *vmap(struct page **pages, unsigned int count,
		unsigned long flags, pgprot_t prot)
{
	struct vm_struct *area;
	unsigned long size;		/* In bytes */

	might_sleep();

	if (count > totalram_pages)
		return NULL;

	size = (unsigned long)count << PAGE_SHIFT;
	area = get_vm_area_caller(size, flags, __builtin_return_address(0));
	if (!area)
		return NULL;

	if (map_vm_area(area, prot, pages)) {
		vunmap(area->addr);
		return NULL;
	}

	return area->addr;
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 51 48.57% 1 12.50%
Andrew Morton 19 18.10% 2 25.00%
Guillermo Julián Moreno 15 14.29% 1 12.50%
Tom Rini 11 10.48% 1 12.50%
Christoph Lameter 5 4.76% 1 12.50%
Peter Zijlstra 3 2.86% 1 12.50%
Jan Beulich 1 0.95% 1 12.50%
Total 105 100.00% 8 100.00%


EXPORT_SYMBOL(vmap);

static void *__vmalloc_node(unsigned long size, unsigned long align,
			    gfp_t gfp_mask, pgprot_t prot,
			    int node, const void *caller);


static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
				 pgprot_t prot, int node)
{
	struct page **pages;
	unsigned int nr_pages, array_size, i;
	const gfp_t nested_gfp = (gfp_mask & GFP_RECLAIM_MASK) | __GFP_ZERO;
	const gfp_t alloc_mask = gfp_mask | __GFP_NOWARN;

	nr_pages = get_vm_area_size(area) >> PAGE_SHIFT;
	array_size = (nr_pages * sizeof(struct page *));

	area->nr_pages = nr_pages;
	/* Please note that the recursion is strictly bounded. */
	if (array_size > PAGE_SIZE) {
		pages = __vmalloc_node(array_size, 1, nested_gfp|__GFP_HIGHMEM,
				PAGE_KERNEL, node, area->caller);
	} else {
		pages = kmalloc_node(array_size, nested_gfp, node);
	}
	area->pages = pages;
	if (!area->pages) {
		remove_vm_area(area->addr);
		kfree(area);
		return NULL;
	}

	for (i = 0; i < area->nr_pages; i++) {
		struct page *page;

		if (fatal_signal_pending(current)) {
			area->nr_pages = i;
			goto fail_no_warn;
		}

		if (node == NUMA_NO_NODE)
			page = alloc_page(alloc_mask);
		else
			page = alloc_pages_node(node, alloc_mask, 0);

		if (unlikely(!page)) {
			/* Successfully allocated i pages, free them in __vunmap() */
			area->nr_pages = i;
			goto fail;
		}
		area->pages[i] = page;
		if (gfpflags_allow_blocking(gfp_mask))
			cond_resched();
	}

	if (map_vm_area(area, prot, pages))
		goto fail;
	return area->addr;

fail:
	warn_alloc(gfp_mask, NULL,
			  "vmalloc: allocation failure, allocated %ld of %ld bytes",
			  (area->nr_pages*PAGE_SIZE), area->size);
fail_no_warn:
	vfree(area->addr);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Andrew Morton 114 36.19% 2 6.45%
Christoph Lameter 42 13.33% 4 12.90%
Christoph Hellwig 30 9.52% 1 3.23%
Linus Torvalds (pre-git) 28 8.89% 4 12.90%
Michal Hocko 23 7.30% 3 9.68%
Dave Hansen 17 5.40% 1 3.23%
Jan Beulich 14 4.44% 1 3.23%
David Rientjes 11 3.49% 1 3.23%
Oleg Nesterov 7 2.22% 2 6.45%
Eric Dumazet 7 2.22% 1 3.23%
Wanpeng Li 5 1.59% 2 6.45%
Dmitriy Vyukov 3 0.95% 1 3.23%
Mel Gorman 3 0.95% 1 3.23%
David S. Miller 2 0.63% 1 3.23%
Jan Kiszka 2 0.63% 1 3.23%
Marcus Alanen 2 0.63% 1 3.23%
Jianguo Wu 2 0.63% 1 3.23%
Vladimir Davydov 1 0.32% 1 3.23%
Al Viro 1 0.32% 1 3.23%
Adrian Bunk 1 0.32% 1 3.23%
Total 315 100.00% 31 100.00%

/**
 *      __vmalloc_node_range  -  allocate virtually contiguous memory
 *      @size:          allocation size
 *      @align:         desired alignment
 *      @start:         vm area range start
 *      @end:           vm area range end
 *      @gfp_mask:      flags for the page level allocator
 *      @prot:          protection mask for the allocated pages
 *      @vm_flags:      additional vm area flags (e.g. %VM_NO_GUARD)
 *      @node:          node to use for allocation or NUMA_NO_NODE
 *      @caller:        caller's return address
 *
 *      Allocate enough pages to cover @size from the page level
 *      allocator with @gfp_mask flags.  Map them into contiguous
 *      kernel virtual space, using a pagetable protection of @prot.
 */


void *__vmalloc_node_range(unsigned long size, unsigned long align,
			unsigned long start, unsigned long end, gfp_t gfp_mask,
			pgprot_t prot, unsigned long vm_flags, int node,
			const void *caller)
{
	struct vm_struct *area;
	void *addr;
	unsigned long real_size = size;

	size = PAGE_ALIGN(size);
	if (!size || (size >> PAGE_SHIFT) > totalram_pages)
		goto fail;

	area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED |
				vm_flags, start, end, node, gfp_mask, caller);
	if (!area)
		goto fail;

	addr = __vmalloc_area_node(area, gfp_mask, prot, node);
	if (!addr)
		return NULL;

	/*
         * In this function, newly allocated vm_struct has VM_UNINITIALIZED
         * flag. It means that vm_struct is not fully initialized.
         * Now, it is fully initialized, so remove this flag here.
         */
	clear_vm_uninitialized_flag(area);

	/*
         * A ref_count = 2 is needed because vm_struct allocated in
         * __get_vm_area_node() contains a reference to the virtual address of
         * the vmalloc'ed block.
         */
	kmemleak_alloc(addr, real_size, 2, gfp_mask);

	return addr;

fail:
	warn_alloc(gfp_mask, NULL,
			  "vmalloc: allocation failure: %lu bytes", real_size);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Oleg Nesterov 56 33.14% 1 5.26%
Catalin Marinas 27 15.98% 2 10.53%
Christoph Lameter 20 11.83% 2 10.53%
Joe Perches 18 10.65% 1 5.26%
David Rientjes 11 6.51% 1 5.26%
Andrey Ryabinin 6 3.55% 1 5.26%
David S. Miller 6 3.55% 1 5.26%
Mitsuo Hayasaka 5 2.96% 1 5.26%
Mel Gorman 5 2.96% 1 5.26%
Michal Hocko 4 2.37% 2 10.53%
Wanpeng Li 3 1.78% 1 5.26%
Zhang Yanfei 3 1.78% 1 5.26%
Giridhar Pemmasani 2 1.18% 1 5.26%
Al Viro 1 0.59% 1 5.26%
Jan Beulich 1 0.59% 1 5.26%
Marek Szyprowski 1 0.59% 1 5.26%
Total 169 100.00% 19 100.00%

/**
 *      __vmalloc_node  -  allocate virtually contiguous memory
 *      @size:          allocation size
 *      @align:         desired alignment
 *      @gfp_mask:      flags for the page level allocator
 *      @prot:          protection mask for the allocated pages
 *      @node:          node to use for allocation or NUMA_NO_NODE
 *      @caller:        caller's return address
 *
 *      Allocate enough pages to cover @size from the page level
 *      allocator with @gfp_mask flags.  Map them into contiguous
 *      kernel virtual space, using a pagetable protection of @prot.
 */


static void *__vmalloc_node(unsigned long size, unsigned long align,
			    gfp_t gfp_mask, pgprot_t prot,
			    int node, const void *caller)
{
	return __vmalloc_node_range(size, align, VMALLOC_START, VMALLOC_END,
				gfp_mask, prot, 0, node, caller);
}

Contributors
Person Tokens Prop Commits CommitProp
David Rientjes 48 94.12% 1 33.33%
Andrey Ryabinin 2 3.92% 1 33.33%
Marek Szyprowski 1 1.96% 1 33.33%
Total 51 100.00% 3 100.00%



void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot)
{
	return __vmalloc_node(size, 1, gfp_mask, prot, NUMA_NO_NODE,
				__builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 29 82.86% 2 40.00%
Oleg Nesterov 3 8.57% 1 20.00%
David S. Miller 2 5.71% 1 20.00%
David Rientjes 1 2.86% 1 20.00%
Total 35 100.00% 5 100.00%


EXPORT_SYMBOL(__vmalloc);



static inline void *__vmalloc_node_flags(unsigned long size,
					int node, gfp_t flags)
{
	return __vmalloc_node(size, 1, flags, PAGE_KERNEL,
					node, __builtin_return_address(0));
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Young 37 100.00% 1 100.00%
Total 37 100.00% 1 100.00%

/**
 *      vmalloc  -  allocate virtually contiguous memory
 *      @size:          allocation size
 *      Allocate enough pages to cover @size from the page level
 *      allocator and map them into contiguous kernel virtual space.
 *
 *      For tight control over page level allocator and protection flags
 *      use __vmalloc() instead.
 */


void *vmalloc(unsigned long size)
{
	return __vmalloc_node_flags(size, NUMA_NO_NODE,
				    GFP_KERNEL | __GFP_HIGHMEM);
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 16 72.73% 1 25.00%
Dave Young 4 18.18% 1 25.00%
David S. Miller 1 4.55% 1 25.00%
David Rientjes 1 4.55% 1 25.00%
Total 22 100.00% 4 100.00%


EXPORT_SYMBOL(vmalloc);

/**
 *      vzalloc - allocate virtually contiguous memory with zero fill
 *      @size:  allocation size
 *      Allocate enough pages to cover @size from the page level
 *      allocator and map them into contiguous kernel virtual space.
 *      The memory allocated is set to zero.
 *
 *      For tight control over page level allocator and protection flags
 *      use __vmalloc() instead.
 */


void *vzalloc(unsigned long size)
{
	return __vmalloc_node_flags(size, NUMA_NO_NODE,
				GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
}
Contributors
Person Tokens Prop Commits CommitProp
Dave Young 18 75.00% 1 25.00%
Christoph Hellwig 3 12.50% 1 25.00%
Christoph Lameter 2 8.33% 1 25.00%
David Rientjes 1 4.17% 1 25.00%
Total 24 100.00% 4 100.00%


EXPORT_SYMBOL(vzalloc);

/**
 * vmalloc_user - allocate zeroed virtually contiguous memory for userspace
 * @size: allocation size
 *
 * The resulting memory area is zeroed so it can be mapped to userspace
 * without leaking data.
 */


void *vmalloc_user(unsigned long size)
{
	struct vm_struct *area;
	void *ret;

	ret = __vmalloc_node(size, SHMLBA,
			     GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO,
			     PAGE_KERNEL, NUMA_NO_NODE,
			     __builtin_return_address(0));
	if (ret) {
		area = find_vm_area(ret);
		area->flags |= VM_USERMAP;
	}
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 49 75.38% 2 33.33%
Glauber de Oliveira Costa 7 10.77% 1 16.67%
Eric Dumazet 6 9.23% 1 16.67%
David S. Miller 2 3.08% 1 16.67%
David Rientjes 1 1.54% 1 16.67%
Total 65 100.00% 6 100.00%


EXPORT_SYMBOL(vmalloc_user);

/**
 *      vmalloc_node  -  allocate memory on a specific node
 *      @size:          allocation size
 *      @node:          numa node
 *
 *      Allocate enough pages to cover @size from the page level
 *      allocator and map them into contiguous kernel virtual space.
 *
 *      For tight control over page level allocator and protection flags
 *      use __vmalloc() instead.
 */


void *vmalloc_node(unsigned long size, int node)
{
	return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL,
					node, __builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 32 94.12% 2 66.67%
David S. Miller 2 5.88% 1 33.33%
Total 34 100.00% 3 100.00%


EXPORT_SYMBOL(vmalloc_node);

/**
 * vzalloc_node - allocate memory on a specific node with zero fill
 * @size:       allocation size
 * @node:       numa node
 *
 * Allocate enough pages to cover @size from the page level
 * allocator and map them into contiguous kernel virtual space.
 * The memory allocated is set to zero.
 *
 * For tight control over page level allocator and protection flags
 * use __vmalloc_node() instead.
 */


void *vzalloc_node(unsigned long size, int node)
{
	return __vmalloc_node_flags(size, node,
			 GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO);
}
Contributors
Person Tokens Prop Commits CommitProp
Dave Young 27 100.00% 1 100.00%
Total 27 100.00% 1 100.00%


EXPORT_SYMBOL(vzalloc_node);

#ifndef PAGE_KERNEL_EXEC

# define PAGE_KERNEL_EXEC PAGE_KERNEL
#endif

/**
 *      vmalloc_exec  -  allocate virtually contiguous, executable memory
 *      @size:          allocation size
 *
 *      Kernel-internal function to allocate enough pages to cover @size
 *      the page level allocator and map them into contiguous and
 *      executable kernel virtual space.
 *
 *      For tight control over page level allocator and protection flags
 *      use __vmalloc() instead.
 */



void *vmalloc_exec(unsigned long size)
{
	return __vmalloc_node(size, 1, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC,
			      NUMA_NO_NODE, __builtin_return_address(0));
}

Contributors
Person Tokens Prop Commits CommitProp
Ingo Molnar 21 67.74% 1 25.00%
Glauber de Oliveira Costa 7 22.58% 1 25.00%
David S. Miller 2 6.45% 1 25.00%
David Rientjes 1 3.23% 1 25.00%
Total 31 100.00% 4 100.00%

#if defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA32)

#define GFP_VMALLOC32 GFP_DMA32 | GFP_KERNEL
#elif defined(CONFIG_64BIT) && defined(CONFIG_ZONE_DMA)

#define GFP_VMALLOC32 GFP_DMA | GFP_KERNEL
#else

#define GFP_VMALLOC32 GFP_KERNEL
#endif

/**
 *      vmalloc_32  -  allocate virtually contiguous memory (32bit addressable)
 *      @size:          allocation size
 *
 *      Allocate enough 32bit PA addressable pages to cover @size from the
 *      page level allocator and map them into contiguous kernel virtual space.
 */


void *vmalloc_32(unsigned long size)
{
	return __vmalloc_node(size, 1, GFP_VMALLOC32, PAGE_KERNEL,
			      NUMA_NO_NODE, __builtin_return_address(0));
}
Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 15 51.72% 1 14.29%
Glauber de Oliveira Costa 7 24.14% 1 14.29%
Linus Torvalds (pre-git) 3 10.34% 2 28.57%
David S. Miller 2 6.90% 1 14.29%
David Rientjes 1 3.45% 1 14.29%
Andi Kleen 1 3.45% 1 14.29%
Total 29 100.00% 7 100.00%


EXPORT_SYMBOL(vmalloc_32);

/**
 * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory
 *      @size:          allocation size
 *
 * The resulting memory area is 32bit addressable and zeroed so it can be
 * mapped to userspace without leaking data.
 */


void *vmalloc_32_user(unsigned long size)
{
	struct vm_struct *area;
	void *ret;

	ret = __vmalloc_node(size, 1, GFP_VMALLOC32 | __GFP_ZERO, PAGE_KERNEL,
			     NUMA_NO_NODE, __builtin_return_address(0));
	if (ret) {
		area = find_vm_area(ret);
		area->flags |= VM_USERMAP;
	}
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 46 73.02% 2 28.57%
Glauber de Oliveira Costa 7 11.11% 1 14.29%
Eric Dumazet 6 9.52% 1 14.29%
David S. Miller 2 3.17% 1 14.29%
David Rientjes 1 1.59% 1 14.29%
Andi Kleen 1 1.59% 1 14.29%
Total 63 100.00% 7 100.00%


EXPORT_SYMBOL(vmalloc_32_user);

/*
 * small helper routine , copy contents to buf from addr.
 * If the page is not present, fill zero.
 */



static int aligned_vread(char *buf, char *addr, unsigned long count)
{
	struct page *p;
	int copied = 0;

	while (count) {
		unsigned long offset, length;

		offset = offset_in_page(addr);
		length = PAGE_SIZE - offset;
		if (length > count)
			length = count;
		p = vmalloc_to_page(addr);
		/*
                 * To do safe access to this _mapped_ area, we need
                 * lock. But adding lock here means that we need to add
                 * overhead of vmalloc()/vfree() calles for this _debug_
                 * interface, rarely used. Instead of that, we'll use
                 * kmap() and get small overhead in this access function.
                 */
		if (p) {
			/*
                         * we can expect USER0 is not used (see vread/vwrite's
                         * function description)
                         */
			void *map = kmap_atomic(p);
			memcpy(buf, map + offset, length);
			kunmap_atomic(map);
		} else
			memset(buf, 0, length);

		addr += length;
		buf += length;
		copied += length;
		count -= length;
	}
	return copied;
}

Contributors
Person Tokens Prop Commits CommitProp
Kamezawa Hiroyuki 129 97.73% 1 50.00%
Alexander Kuleshov 3 2.27% 1 50.00%
Total 132 100.00% 2 100.00%



static int aligned_vwrite(char *buf, char *addr, unsigned long count)
{
	struct page *p;
	int copied = 0;

	while (count) {
		unsigned long offset, length;

		offset = offset_in_page(addr);
		length = PAGE_SIZE - offset;
		if (length > count)
			length = count;
		p = vmalloc_to_page(addr);
		/*
                 * To do safe access to this _mapped_ area, we need
                 * lock. But adding lock here means that we need to add
                 * overhead of vmalloc()/vfree() calles for this _debug_
                 * interface, rarely used. Instead of that, we'll use
                 * kmap() and get small overhead in this access function.
                 */
		if (p) {
			/*
                         * we can expect USER0 is not used (see vread/vwrite's
                         * function description)
                         */
			void *map = kmap_atomic(p);
			memcpy(map + offset, buf, length);
			kunmap_atomic(map);
		}
		addr += length;
		buf += length;
		copied += length;
		count -= length;
	}
	return copied;
}

Contributors
Person Tokens Prop Commits CommitProp
Kamezawa Hiroyuki 119 97.54% 1 50.00%
Alexander Kuleshov 3 2.46% 1 50.00%
Total 122 100.00% 2 100.00%

/**
 *      vread() -  read vmalloc area in a safe way.
 *      @buf:           buffer for reading data
 *      @addr:          vm address.
 *      @count:         number of bytes to be read.
 *
 *      Returns # of bytes which addr and buf should be increased.
 *      (same number to @count). Returns 0 if [addr...addr+count) doesn't
 *      includes any intersect with alive vmalloc area.
 *
 *      This function checks that addr is a valid vmalloc'ed area, and
 *      copy data from that area to a given buffer. If the given memory range
 *      of [addr...addr+count) includes some valid address, data is copied to
 *      proper area of @buf. If there are memory holes, they'll be zero-filled.
 *      IOREMAP area is treated as memory hole and no copy is done.
 *
 *      If [addr...addr+count) doesn't includes any intersects with alive
 *      vm_struct area, returns 0. @buf should be kernel's buffer.
 *
 *      Note: In usual ops, vread() is never necessary because the caller
 *      should know vmalloc() area is valid and can use memcpy().
 *      This is for routines which have to access vmalloc area without
 *      any informaion, as /dev/kmem.
 *
 */



long vread(char *buf, char *addr, unsigned long count)
{
	struct vmap_area *va;
	struct vm_struct *vm;
	char *vaddr, *buf_start = buf;
	unsigned long buflen = count;
	unsigned long n;

	/* Don't allow overflow */
	if ((unsigned long) addr + count < count)
		count = -(unsigned long) addr;

	spin_lock(&vmap_area_lock);
	list_for_each_entry(va, &vmap_area_list, list) {
		if (!count)
			break;

		if (!(va->flags & VM_VM_AREA))
			continue;

		vm = va->vm;
		vaddr = (char *) vm->addr;
		if (addr >= vaddr + get_vm_area_size(vm))
			continue;
		while (addr < vaddr) {
			if (count == 0)
				goto finished;
			*buf = '\0';
			buf++;
			addr++;
			count--;
		}
		n = vaddr + get_vm_area_size(vm) - addr;
		if (n > count)
			n = count;
		if (!(vm->flags & VM_IOREMAP))
			aligned_vread(buf, addr, n);
		else /* IOREMAP area is treated as memory hole */
			memset(buf, 0, n);
		buf += n;
		addr += n;
		count -= n;
	}
finished:
	spin_unlock(&vmap_area_lock);

	if (buf == buf_start)
		return 0;
	/* zero-fill memory holes */
	if (buf != buf_start + buflen)
		memset(buf, 0, buflen - (buf - buf_start));

	return buflen;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 142 52.79% 6 66.67%
Kamezawa Hiroyuki 77 28.62% 1 11.11%
JoonSoo Kim 44 16.36% 1 11.11%
Wanpeng Li 6 2.23% 1 11.11%
Total 269 100.00% 9 100.00%

/**
 *      vwrite() -  write vmalloc area in a safe way.
 *      @buf:           buffer for source data
 *      @addr:          vm address.
 *      @count:         number of bytes to be read.
 *
 *      Returns # of bytes which addr and buf should be incresed.
 *      (same number to @count).
 *      If [addr...addr+count) doesn't includes any intersect with valid
 *      vmalloc area, returns 0.
 *
 *      This function checks that addr is a valid vmalloc'ed area, and
 *      copy data from a buffer to the given addr. If specified range of
 *      [addr...addr+count) includes some valid address, data is copied from
 *      proper area of @buf. If there are memory holes, no copy to hole.
 *      IOREMAP area is treated as memory hole and no copy is done.
 *
 *      If [addr...addr+count) doesn't includes any intersects with alive
 *      vm_struct area, returns 0. @buf should be kernel's buffer.
 *
 *      Note: In usual ops, vwrite() is never necessary because the caller
 *      should know vmalloc() area is valid and can use memcpy().
 *      This is for routines which have to access vmalloc area without
 *      any informaion, as /dev/kmem.
 */



long vwrite(char *buf, char *addr, unsigned long count)
{
	struct vmap_area *va;
	struct vm_struct *vm;
	char *vaddr;
	unsigned long n, buflen;
	int copied = 0;

	/* Don't allow overflow */
	if ((unsigned long) addr + count < count)
		count = -(unsigned long) addr;
	buflen = count;

	spin_lock(&vmap_area_lock);
	list_for_each_entry(va, &vmap_area_list, list) {
		if (!count)
			break;

		if (!(va->flags & VM_VM_AREA))
			continue;

		vm = va->vm;
		vaddr = (char *) vm->addr;
		if (addr >= vaddr + get_vm_area_size(vm))
			continue;
		while (addr < vaddr) {
			if (count == 0)
				goto finished;
			buf++;
			addr++;
			count--;
		}
		n = vaddr + get_vm_area_size(vm) - addr;
		if (n > count)
			n = count;
		if (!(vm->flags & VM_IOREMAP)) {
			aligned_vwrite(buf, addr, n);
			copied++;
		}
		buf += n;
		addr += n;
		count -= n;
	}
finished:
	spin_unlock(&vmap_area_lock);
	if (!copied)
		return 0;
	return buflen;
}

Contributors
Person Tokens Prop Commits CommitProp
Dave Jones 129 55.36% 1 25.00%
Kamezawa Hiroyuki 54 23.18% 1 25.00%
JoonSoo Kim 44 18.88% 1 25.00%
Wanpeng Li 6 2.58% 1 25.00%
Total 233 100.00% 4 100.00%

/**
 *      remap_vmalloc_range_partial  -  map vmalloc pages to userspace
 *      @vma:           vma to cover
 *      @uaddr:         target user address to start at
 *      @kaddr:         virtual address of vmalloc kernel memory
 *      @size:          size of map area
 *
 *      Returns:        0 for success, -Exxx on failure
 *
 *      This function checks that @kaddr is a valid vmalloc'ed area,
 *      and that it is big enough to cover the range starting at
 *      @uaddr in @vma. Will return failure if that criteria isn't
 *      met.
 *
 *      Similar to remap_pfn_range() (see mm/memory.c)
 */


int remap_vmalloc_range_partial(struct vm_area_struct *vma, unsigned long uaddr,
				void *kaddr, unsigned long size)
{
	struct vm_struct *area;

	size = PAGE_ALIGN(size);

	if (!PAGE_ALIGNED(uaddr) || !PAGE_ALIGNED(kaddr))
		return -EINVAL;

	area = find_vm_area(kaddr);
	if (!area)
		return -EINVAL;

	if (!(area->flags & VM_USERMAP))
		return -EINVAL;

	if (kaddr + size > area->addr + area->size)
		return -EINVAL;

	do {
		struct page *page = vmalloc_to_page(kaddr);
		int ret;

		ret = vm_insert_page(vma, uaddr, page);
		if (ret)
			return ret;

		uaddr += PAGE_SIZE;
		kaddr += PAGE_SIZE;
		size -= PAGE_SIZE;
	} while (size > 0);

	vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 126 76.36% 2 50.00%
Daisuke Hatayama 36 21.82% 1 25.00%
Konstantin Khlebnikov 3 1.82% 1 25.00%
Total 165 100.00% 4 100.00%


EXPORT_SYMBOL(remap_vmalloc_range_partial);

/**
 *      remap_vmalloc_range  -  map vmalloc pages to userspace
 *      @vma:           vma to cover (map full range of vma)
 *      @addr:          vmalloc memory
 *      @pgoff:         number of pages into addr before first page to map
 *
 *      Returns:        0 for success, -Exxx on failure
 *
 *      This function checks that addr is a valid vmalloc'ed area, and
 *      that it is big enough to cover the vma. Will return failure if
 *      that criteria isn't met.
 *
 *      Similar to remap_pfn_range() (see mm/memory.c)
 */


int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
						unsigned long pgoff)
{
	return remap_vmalloc_range_partial(vma, vma->vm_start,
					   addr + (pgoff << PAGE_SHIFT),
					   vma->vm_end - vma->vm_start);
}
Contributors
Person Tokens Prop Commits CommitProp
Daisuke Hatayama 44 100.00% 1 100.00%
Total 44 100.00% 1 100.00%


EXPORT_SYMBOL(remap_vmalloc_range);

/*
 * Implement a stub for vmalloc_sync_all() if the architecture chose not to
 * have one.
 */


void __weak vmalloc_sync_all(void)
{
}


Contributors
Person Tokens Prop Commits CommitProp
Christoph Hellwig 4 57.14% 1 50.00%
Gideon Israel Dsouza 3 42.86% 1 50.00%
Total 7 100.00% 2 100.00%



static int f(pte_t *pte, pgtable_t table, unsigned long addr, void *data)
{
	pte_t ***p = data;

	if (p) {
		*(*p) = pte;
		(*p)++;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
David Vrabel 28 53.85% 1 33.33%
Jeremy Fitzhardinge 22 42.31% 1 33.33%
Martin Schwidefsky 2 3.85% 1 33.33%
Total 52 100.00% 3 100.00%

/**
 *      alloc_vm_area - allocate a range of kernel address space
 *      @size:          size of the area
 *      @ptes:          returns the PTEs for the address space
 *
 *      Returns:        NULL on failure, vm_struct on success
 *
 *      This function reserves a range of kernel address space, and
 *      allocates pagetables to map that range.  No actual mappings
 *      are created.
 *
 *      If @ptes is non-NULL, pointers to the PTEs (in init_mm)
 *      allocated for the VM area are returned.
 */


struct vm_struct *alloc_vm_area(size_t size, pte_t **ptes)
{
	struct vm_struct *area;

	area = get_vm_area_caller(size, VM_IOREMAP,
				__builtin_return_address(0));
	if (area == NULL)
		return NULL;

	/*
         * This ensures that page tables are constructed for this region
         * of kernel virtual address space and mapped into init_mm.
         */
	if (apply_to_page_range(&init_mm, (unsigned long)area->addr,
				size, f, ptes ? &ptes : NULL)) {
		free_vm_area(area);
		return NULL;
	}

	return area;
}
Contributors
Person Tokens Prop Commits CommitProp
Jeremy Fitzhardinge 68 80.95% 1 33.33%
David Vrabel 10 11.90% 1 33.33%
Christoph Lameter 6 7.14% 1 33.33%
Total 84 100.00% 3 100.00%


EXPORT_SYMBOL_GPL(alloc_vm_area);



void free_vm_area(struct vm_struct *area)
{
	struct vm_struct *ret;
	ret = remove_vm_area(area->addr);
	BUG_ON(ret != area);
	kfree(area);
}
Contributors
Person Tokens Prop Commits CommitProp
Jeremy Fitzhardinge 36 100.00% 1 100.00%
Total 36 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(free_vm_area);

#ifdef CONFIG_SMP


static struct vmap_area *node_to_va(struct rb_node *n)
{
	return rb_entry_safe(n, struct vmap_area, rb_node);
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 23 95.83% 1 50.00%
Geliang Tang 1 4.17% 1 50.00%
Total 24 100.00% 2 100.00%

/**
 * pvm_find_next_prev - find the next and prev vmap_area surrounding @end
 * @end: target address
 * @pnext: out arg for the next vmap_area
 * @pprev: out arg for the previous vmap_area
 *
 * Returns: %true if either or both of next and prev are found,
 *          %false if no vmap_area exists
 *
 * Find vmap_areas end addresses of which enclose @end.  ie. if not
 * NULL, *pnext->va_end > @end and *pprev->va_end <= @end.
 */


static bool pvm_find_next_prev(unsigned long end,
			       struct vmap_area **pnext,
			       struct vmap_area **pprev)
{
	struct rb_node *n = vmap_area_root.rb_node;
	struct vmap_area *va = NULL;

	while (n) {
		va = rb_entry(n, struct vmap_area, rb_node);
		if (end < va->va_end)
			n = n->rb_left;
		else if (end > va->va_end)
			n = n->rb_right;
		else
			break;
	}

	if (!va)
		return false;

	if (va->va_end > end) {
		*pnext = va;
		*pprev = node_to_va(rb_prev(&(*pnext)->rb_node));
	} else {
		*pprev = va;
		*pnext = node_to_va(rb_next(&(*pprev)->rb_node));
	}
	return true;
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 155 100.00% 1 100.00%
Total 155 100.00% 1 100.00%

/**
 * pvm_determine_end - find the highest aligned address between two vmap_areas
 * @pnext: in/out arg for the next vmap_area
 * @pprev: in/out arg for the previous vmap_area
 * @align: alignment
 *
 * Returns: determined end address
 *
 * Find the highest aligned address between *@pnext and *@pprev below
 * VMALLOC_END.  *@pnext and *@pprev are adjusted so that the aligned
 * down address is between the end addresses of the two vmap_areas.
 *
 * Please note that the address returned by this function may fall
 * inside *@pnext vmap_area.  The caller is responsible for checking
 * that.
 */


static unsigned long pvm_determine_end(struct vmap_area **pnext,
				       struct vmap_area **pprev,
				       unsigned long align)
{
	const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1);
	unsigned long addr;

	if (*pnext)
		addr = min((*pnext)->va_start & ~(align - 1), vmalloc_end);
	else
		addr = vmalloc_end;

	while (*pprev && (*pprev)->va_end > addr) {
		*pnext = *pprev;
		*pprev = node_to_va(rb_prev(&(*pnext)->rb_node));
	}

	return addr;
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 114 100.00% 1 100.00%
Total 114 100.00% 1 100.00%

/**
 * pcpu_get_vm_areas - allocate vmalloc areas for percpu allocator
 * @offsets: array containing offset of each area
 * @sizes: array containing size of each area
 * @nr_vms: the number of areas to allocate
 * @align: alignment, all entries in @offsets and @sizes must be aligned to this
 *
 * Returns: kmalloc'd vm_struct pointer array pointing to allocated
 *          vm_structs on success, %NULL on failure
 *
 * Percpu allocator wants to use congruent vm areas so that it can
 * maintain the offsets among percpu areas.  This function allocates
 * congruent vmalloc areas for it with GFP_KERNEL.  These areas tend to
 * be scattered pretty far, distance between two areas easily going up
 * to gigabytes.  To avoid interacting with regular vmallocs, these
 * areas are allocated from top.
 *
 * Despite its complicated look, this allocator is rather simple.  It
 * does everything top-down and scans areas from the end looking for
 * matching slot.  While scanning, if any of the areas overlaps with
 * existing vmap_area, the base address is pulled down to fit the
 * area.  Scanning is repeated till all the areas fit and then all
 * necessary data structres are inserted and the result is returned.
 */


struct vm_struct **pcpu_get_vm_areas(const unsigned long *offsets,
				     const size_t *sizes, int nr_vms,
				     size_t align)
{
	const unsigned long vmalloc_start = ALIGN(VMALLOC_START, align);
	const unsigned long vmalloc_end = VMALLOC_END & ~(align - 1);
	struct vmap_area **vas, *prev, *next;
	struct vm_struct **vms;
	int area, area2, last_area, term_area;
	unsigned long base, start, end, last_end;
	bool purged = false;

	/* verify parameters and allocate data structures */
	BUG_ON(offset_in_page(align) || !is_power_of_2(align));
	for (last_area = 0, area = 0; area < nr_vms; area++) {
		start = offsets[area];
		end = start + sizes[area];

		/* is everything aligned properly? */
		BUG_ON(!IS_ALIGNED(offsets[area], align));
		BUG_ON(!IS_ALIGNED(sizes[area], align));

		/* detect the area with the highest address */
		if (start > offsets[last_area])
			last_area = area;

		for (area2 = 0; area2 < nr_vms; area2++) {
			unsigned long start2 = offsets[area2];
			unsigned long end2 = start2 + sizes[area2];

			if (area2 == area)
				continue;

			BUG_ON(start2 >= start && start2 < end);
			BUG_ON(end2 <= end && end2 > start);
		}
	}
	last_end = offsets[last_area] + sizes[last_area];

	if (vmalloc_end - vmalloc_start < last_end) {
		WARN_ON(true);
		return NULL;
	}

	vms = kcalloc(nr_vms, sizeof(vms[0]), GFP_KERNEL);
	vas = kcalloc(nr_vms, sizeof(vas[0]), GFP_KERNEL);
	if (!vas || !vms)
		goto err_free2;

	for (area = 0; area < nr_vms; area++) {
		vas[area] = kzalloc(sizeof(struct vmap_area), GFP_KERNEL);
		vms[area] = kzalloc(sizeof(struct vm_struct), GFP_KERNEL);
		if (!vas[area] || !vms[area])
			goto err_free;
	}
retry:
	spin_lock(&vmap_area_lock);

	/* start scanning - we scan from the top, begin with the last area */
	area = term_area = last_area;
	start = offsets[area];
	end = start + sizes[area];

	if (!pvm_find_next_prev(vmap_area_pcpu_hole, &next, &prev)) {
		base = vmalloc_end - last_end;
		goto found;
	}
	base = pvm_determine_end(&next, &prev, align) - end;

	while (true) {
		BUG_ON(next && next->va_end <= base + end);
		BUG_ON(prev && prev->va_end > base + end);

		/*
                 * base might have underflowed, add last_end before
                 * comparing.
                 */
		if (base + last_end < vmalloc_start + last_end) {
			spin_unlock(&vmap_area_lock);
			if (!purged) {
				purge_vmap_area_lazy();
				purged = true;
				goto retry;
			}
			goto err_free;
		}

		/*
                 * If next overlaps, move base downwards so that it's
                 * right below next and then recheck.
                 */
		if (next && next->va_start < base + end) {
			base = pvm_determine_end(&next, &prev, align) - end;
			term_area = area;
			continue;
		}

		/*
                 * If prev overlaps, shift down next and prev and move
                 * base so that it's right below new next and then
                 * recheck.
                 */
		if (prev && prev->va_end > base + start)  {
			next = prev;
			prev = node_to_va(rb_prev(&next->rb_node));
			base = pvm_determine_end(&next, &prev, align) - end;
			term_area = area;
			continue;
		}

		/*
                 * This area fits, move on to the previous one.  If
                 * the previous one is the terminal one, we're done.
                 */
		area = (area + nr_vms - 1) % nr_vms;
		if (area == term_area)
			break;
		start = offsets[area];
		end = start + sizes[area];
		pvm_find_next_prev(base + end, &next, &prev);
	}
found:
	/* we've found a fitting base, insert all va's */
	for (area = 0; area < nr_vms; area++) {
		struct vmap_area *va = vas[area];

		va->va_start = base + offsets[area];
		va->va_end = va->va_start + sizes[area];
		__insert_vmap_area(va);
	}

	vmap_area_pcpu_hole = base + offsets[last_area];

	spin_unlock(&vmap_area_lock);

	/* insert all vm's */
	for (area = 0; area < nr_vms; area++)
		setup_vmalloc_vm(vms[area], vas[area], VM_ALLOC,
				 pcpu_get_vm_areas);

	kfree(vas);
	return vms;

err_free:
	for (area = 0; area < nr_vms; area++) {
		kfree(vas[area]);
		kfree(vms[area]);
	}
err_free2:
	kfree(vas);
	kfree(vms);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 809 97.94% 1 16.67%
Thomas Meyer 6 0.73% 1 16.67%
David Rientjes 4 0.48% 1 16.67%
Alexander Kuleshov 3 0.36% 1 16.67%
Kautuk Consul 3 0.36% 1 16.67%
Zhang Yanfei 1 0.12% 1 16.67%
Total 826 100.00% 6 100.00%

/**
 * pcpu_free_vm_areas - free vmalloc areas for percpu allocator
 * @vms: vm_struct pointer array returned by pcpu_get_vm_areas()
 * @nr_vms: the number of allocated areas
 *
 * Free vm_structs and the array allocated by pcpu_get_vm_areas().
 */


void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
{
	int i;

	for (i = 0; i < nr_vms; i++)
		free_vm_area(vms[i]);
	kfree(vms);
}
Contributors
Person Tokens Prop Commits CommitProp
Tejun Heo 43 100.00% 1 100.00%
Total 43 100.00% 1 100.00%

#endif	/* CONFIG_SMP */

#ifdef CONFIG_PROC_FS

static void *s_start(struct seq_file *m, loff_t *pos)
	__acquires(&vmap_area_lockContributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 14 82.35% 1 33.33%
Namhyung Kim 2 11.76% 1 33.33%
JoonSoo Kim 1 5.88% 1 33.33%
Total 17 100.00% 3 100.00%

)
{
	spin_lock(&vmap_area_lock);
	return seq_list_start(&vmap_area_list, *pos);
}



static void *s_next(struct seq_file *m, void *p, loff_t *pos)
{
	return seq_list_next(p, &vmap_area_list, pos);
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 20 64.52% 1 33.33%
zijun_hu 6 19.35% 1 33.33%
JoonSoo Kim 5 16.13% 1 33.33%
Total 31 100.00% 3 100.00%


static void s_stop(struct seq_file *m, void *p)
	__releases(&vmap_area_lockContributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 13 81.25% 1 33.33%
Namhyung Kim 2 12.50% 1 33.33%
JoonSoo Kim 1 6.25% 1 33.33%
Total 16 100.00% 3 100.00%

)
{
	spin_unlock(&vmap_area_lock);
}



static void show_numa_info(struct seq_file *m, struct vm_struct *v)
{
	if (IS_ENABLED(CONFIG_NUMA)) {
		unsigned int nr, *counters = m->private;

		if (!counters)
			return;

		if (v->flags & VM_UNINITIALIZED)
			return;
		/* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
		smp_rmb();

		memset(counters, 0, nr_node_ids * sizeof(unsigned int));

		for (nr = 0; nr < v->nr_pages; nr++)
			counters[page_to_nid(v->pages[nr])]++;

		for_each_node_state(nr, N_HIGH_MEMORY)
			if (counters[nr])
				seq_printf(m, " N%u=%u", nr, counters[nr]);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Eric Dumazet 109 86.51% 1 25.00%
Wanpeng Li 9 7.14% 1 25.00%
Kirill A. Shutemov 4 3.17% 1 25.00%
Dmitriy Vyukov 4 3.17% 1 25.00%
Total 126 100.00% 4 100.00%



static int s_show(struct seq_file *m, void *p)
{
	struct vmap_area *va;
	struct vm_struct *v;

	va = list_entry(p, struct vmap_area, list);

	/*
         * s_show can encounter race with remove_vm_area, !VM_VM_AREA on
         * behalf of vmap area is being tear down or vm_map_ram allocation.
         */
	if (!(va->flags & VM_VM_AREA))
		return 0;

	v = va->vm;

	seq_printf(m, "0x%pK-0x%pK %7ld",
		v->addr, v->addr + v->size, v->size);

	if (v->caller)
		seq_printf(m, " %pS", v->caller);

	if (v->nr_pages)
		seq_printf(m, " pages=%d", v->nr_pages);

	if (v->phys_addr)
		seq_printf(m, " phys=%pa", &v->phys_addr);

	if (v->flags & VM_IOREMAP)
		seq_puts(m, " ioremap");

	if (v->flags & VM_ALLOC)
		seq_puts(m, " vmalloc");

	if (v->flags & VM_MAP)
		seq_puts(m, " vmap");

	if (v->flags & VM_USERMAP)
		seq_puts(m, " user");

	if (is_vmalloc_addr(v->pages))
		seq_puts(m, " vpages");

	show_numa_info(m, v);
	seq_putc(m, '\n');
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Christoph Lameter 165 73.01% 2 18.18%
JoonSoo Kim 27 11.95% 1 9.09%
zijun_hu 12 5.31% 1 9.09%
Eric Dumazet 7 3.10% 1 9.09%
Fabian Frederick 5 2.21% 1 9.09%
David Rientjes 4 1.77% 1 9.09%
Joe Perches 2 0.88% 1 9.09%
Miles Chen 2 0.88% 1 9.09%
Kees Cook 1 0.44% 1 9.09%
Wanpeng Li 1 0.44% 1 9.09%
Total 226 100.00% 11 100.00%


static const struct seq_operations vmalloc_op = {
	.start = s_start,
	.next = s_next,
	.stop = s_stop,
	.show = s_show,
};



static int vmalloc_open(struct inode *inode, struct file *file)
{
	if (IS_ENABLED(CONFIG_NUMA))
		return seq_open_private(file, &vmalloc_op,
					nr_node_ids * sizeof(unsigned int));
	else
		return seq_open(file, &vmalloc_op);
}

Contributors
Person Tokens Prop Commits CommitProp
Alexey Dobriyan 36 72.00% 1 25.00%
Rob Jones 9 18.00% 1 25.00%
Kirill A. Shutemov 4 8.00% 1 25.00%
Vasiliy Kulikov 1 2.00% 1 25.00%
Total 50 100.00% 4 100.00%


static const struct file_operations proc_vmalloc_operations = {
	.open		= vmalloc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release_private,
};



static int __init proc_vmalloc_init(void)
{
	proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Alexey Dobriyan 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%


module_init(proc_vmalloc_init);

#endif

Overall Contributors
Person Tokens Prop Commits CommitProp
Nicholas Piggin 3351 32.01% 9 3.96%
Tejun Heo 1442 13.77% 8 3.52%
Christoph Lameter 631 6.03% 8 3.52%
Kamezawa Hiroyuki 396 3.78% 2 0.88%
Linus Torvalds (pre-git) 390 3.73% 22 9.69%
Christoph Hellwig 334 3.19% 7 3.08%
Hugh Dickins 322 3.08% 2 0.88%
Kirill A. Shutemov 264 2.52% 2 0.88%
Andi Kleen 213 2.03% 4 1.76%
Andrew Morton 206 1.97% 6 2.64%
Roman Peniaev 205 1.96% 3 1.32%
JoonSoo Kim 190 1.81% 7 3.08%
Jeremy Fitzhardinge 176 1.68% 3 1.32%
Al Viro 173 1.65% 2 0.88%
Chris Wilson 140 1.34% 2 0.88%
Eric Dumazet 135 1.29% 3 1.32%
Dave Jones 131 1.25% 1 0.44%
Nico Pitre 110 1.05% 1 0.44%
Andrey Ryabinin 101 0.96% 4 1.76%
Alexey Dobriyan 99 0.95% 2 0.88%
Dave Young 99 0.95% 1 0.44%
Daisuke Hatayama 95 0.91% 2 0.88%
David Rientjes 92 0.88% 5 2.20%
Ivan Kokshaysky 72 0.69% 1 0.44%
Oleg Nesterov 70 0.67% 3 1.32%
Linus Torvalds 56 0.53% 3 1.32%
Benjamin Herrenschmidt 53 0.51% 4 1.76%
Catalin Marinas 45 0.43% 2 0.88%
David S. Miller 44 0.42% 2 0.88%
Ingo Molnar 41 0.39% 5 2.20%
zijun_hu 40 0.38% 2 0.88%
James Bottomley 39 0.37% 2 0.88%
David Vrabel 39 0.37% 1 0.44%
Glauber de Oliveira Costa 38 0.36% 3 1.32%
Joel Fernandes 38 0.36% 1 0.44%
Mitsuo Hayasaka 33 0.32% 1 0.44%
Wanpeng Li 33 0.32% 5 2.20%
Arnaldo Carvalho de Melo 32 0.31% 1 0.44%
Russell King 31 0.30% 2 0.88%
Michal Hocko 27 0.26% 3 1.32%
Tom Rini 25 0.24% 1 0.44%
Guillermo Julián Moreno 23 0.22% 1 0.44%
Toshi Kani 22 0.21% 2 0.88%
Vassili Karpov 21 0.20% 1 0.44%
Joe Perches 21 0.20% 3 1.32%
Cliff Wickman 19 0.18% 1 0.44%
Alexander Kuleshov 18 0.17% 1 0.44%
Zhang Yanfei 17 0.16% 4 1.76%
Dave Hansen 17 0.16% 1 0.44%
Jan Beulich 16 0.15% 2 0.88%
Jan Kara 15 0.14% 1 0.44%
Hong Zhi Guo 12 0.11% 1 0.44%
Mel Gorman 11 0.11% 3 1.32%
Thomas Gleixner 10 0.10% 1 0.44%
Namhyung Kim 10 0.10% 2 0.88%
Rob Jones 9 0.09% 1 0.44%
Jiri Slaby 8 0.08% 1 0.44%
MinChan Kim 8 0.08% 2 0.88%
Wang Xiaoqiang 8 0.08% 1 0.44%
Marek Szyprowski 8 0.08% 2 0.88%
Vegard Nossum 7 0.07% 1 0.44%
Dmitriy Vyukov 7 0.07% 2 0.88%
Adam Lackorzynski 7 0.07% 1 0.44%
Peter Zijlstra 6 0.06% 1 0.44%
Gideon Israel Dsouza 6 0.06% 1 0.44%
Thomas Meyer 6 0.06% 1 0.44%
Cho KyongHo 6 0.06% 1 0.44%
Jerome Marchand 6 0.06% 1 0.44%
Rusty Russell 5 0.05% 1 0.44%
Huang Ying 5 0.05% 1 0.44%
Arjan van de Ven 5 0.05% 1 0.44%
Marcus Alanen 5 0.05% 1 0.44%
Rolf Eike Beer 5 0.05% 1 0.44%
Ralph Wuerthner 5 0.05% 1 0.44%
Fabian Frederick 5 0.05% 1 0.44%
Vladimir Davydov 4 0.04% 2 0.88%
Lai Jiangshan 4 0.04% 2 0.88%
Giridhar Pemmasani 4 0.04% 1 0.44%
Hirofumi Ogawa 3 0.03% 1 0.44%
WANG Chao 3 0.03% 1 0.44%
Figo.zhang 3 0.03% 1 0.44%
Michael Opdenacker 3 0.03% 1 0.44%
Konstantin Khlebnikov 3 0.03% 1 0.44%
Pekka J Enberg 3 0.03% 1 0.44%
Kautuk Consul 3 0.03% 1 0.44%
Martin Schwidefsky 2 0.02% 1 0.44%
Clemens Ladisch 2 0.02% 1 0.44%
Jan Kiszka 2 0.02% 1 0.44%
Miles Chen 2 0.02% 1 0.44%
Jianguo Wu 2 0.02% 1 0.44%
Américo Wang 2 0.02% 1 0.44%
Geliang Tang 2 0.02% 2 0.88%
Mika Kukkonen 1 0.01% 1 0.44%
Richard Henderson 1 0.01% 1 0.44%
Johannes Weiner 1 0.01% 1 0.44%
Adrian Bunk 1 0.01% 1 0.44%
Simon Arlott 1 0.01% 1 0.44%
Shawn Lin 1 0.01% 1 0.44%
Julia Lawall 1 0.01% 1 0.44%
Kees Cook 1 0.01% 1 0.44%
Arun Sharma 1 0.01% 1 0.44%
Pintu Kumar 1 0.01% 1 0.44%
Gioh Kim 1 0.01% 1 0.44%
Vasiliy Kulikov 1 0.01% 1 0.44%
Total 10469 100.00% 227 100.00%
Directory: mm

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Al Viro	65	100.00%	1	100.00%
Total	65	100.00%	1	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 mm/vmalloc.c

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