Release 4.18 arch/x86/mm/init_64.c

/*
 *  linux/arch/x86_64/mm/init.c
 *
 *  Copyright (C) 1995  Linus Torvalds
 *  Copyright (C) 2000  Pavel Machek <pavel@ucw.cz>
 *  Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
 */

#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/proc_fs.h>
#include <linux/pci.h>
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/dma-mapping.h>
#include <linux/memory.h>
#include <linux/memory_hotplug.h>
#include <linux/memremap.h>
#include <linux/nmi.h>
#include <linux/gfp.h>
#include <linux/kcore.h>

#include <asm/processor.h>
#include <asm/bios_ebda.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/dma.h>
#include <asm/fixmap.h>
#include <asm/e820/api.h>
#include <asm/apic.h>
#include <asm/tlb.h>
#include <asm/mmu_context.h>
#include <asm/proto.h>
#include <asm/smp.h>
#include <asm/sections.h>
#include <asm/kdebug.h>
#include <asm/numa.h>
#include <asm/set_memory.h>
#include <asm/init.h>
#include <asm/uv/uv.h>
#include <asm/setup.h>

#include "mm_internal.h"

#include "ident_map.c"

/*
 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
 * physical space so we can cache the place of the first one and move
 * around without checking the pgd every time.
 */

/* Bits supported by the hardware: */

pteval_t __supported_pte_mask __read_mostly = ~0;
/* Bits allowed in normal kernel mappings: */

pteval_t __default_kernel_pte_mask __read_mostly = ~0;
EXPORT_SYMBOL_GPL(__supported_pte_mask);
/* Used in PAGE_KERNEL_* macros which are reasonably used out-of-tree: */
EXPORT_SYMBOL(__default_kernel_pte_mask);


int force_personality32;

/*
 * noexec32=on|off
 * Control non executable heap for 32bit processes.
 * To control the stack too use noexec=off
 *
 * on   PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
 * off  PROT_READ implies PROT_EXEC
 */


static int __init nonx32_setup(char *str)
{
	if (!strcmp(str, "on"))
		force_personality32 &= ~READ_IMPLIES_EXEC;
	else if (!strcmp(str, "off"))
		force_personality32 |= READ_IMPLIES_EXEC;
	return 1;
}
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__setup("noexec32=", nonx32_setup);



static void sync_global_pgds_l5(unsigned long start, unsigned long end)
{
	unsigned long addr;

	for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
		const pgd_t *pgd_ref = pgd_offset_k(addr);
		struct page *page;

		/* Check for overflow */
		if (addr < start)
			break;

		if (pgd_none(*pgd_ref))
			continue;

		spin_lock(&pgd_lock);
		list_for_each_entry(page, &pgd_list, lru) {
			pgd_t *pgd;
			spinlock_t *pgt_lock;

			pgd = (pgd_t *)page_address(page) + pgd_index(addr);
			/* the pgt_lock only for Xen */
			pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
			spin_lock(pgt_lock);

			if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
				BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));

			if (pgd_none(*pgd))
				set_pgd(pgd, *pgd_ref);

			spin_unlock(pgt_lock);
		}
		spin_unlock(&pgd_lock);
	}
}

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static void sync_global_pgds_l4(unsigned long start, unsigned long end)
{
	unsigned long addr;

	for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
		pgd_t *pgd_ref = pgd_offset_k(addr);
		const p4d_t *p4d_ref;
		struct page *page;

		/*
                 * With folded p4d, pgd_none() is always false, we need to
                 * handle synchonization on p4d level.
                 */
		MAYBE_BUILD_BUG_ON(pgd_none(*pgd_ref));
		p4d_ref = p4d_offset(pgd_ref, addr);

		if (p4d_none(*p4d_ref))
			continue;

		spin_lock(&pgd_lock);
		list_for_each_entry(page, &pgd_list, lru) {
			pgd_t *pgd;
			p4d_t *p4d;
			spinlock_t *pgt_lock;

			pgd = (pgd_t *)page_address(page) + pgd_index(addr);
			p4d = p4d_offset(pgd, addr);
			/* the pgt_lock only for Xen */
			pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
			spin_lock(pgt_lock);

			if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
				BUG_ON(p4d_page_vaddr(*p4d)
				       != p4d_page_vaddr(*p4d_ref));

			if (p4d_none(*p4d))
				set_p4d(p4d, *p4d_ref);

			spin_unlock(pgt_lock);
		}
		spin_unlock(&pgd_lock);
	}
}

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Baoquan He
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Yasuaki Ishimatsu
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Linus Torvalds
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Andrea Arcangeli
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/*
 * When memory was added make sure all the processes MM have
 * suitable PGD entries in the local PGD level page.
 */


void sync_global_pgds(unsigned long start, unsigned long end)
{
	if (pgtable_l5_enabled())
		sync_global_pgds_l5(start, end);
	else
		sync_global_pgds_l4(start, end);
}

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/*
 * NOTE: This function is marked __ref because it calls __init function
 * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
 */


static __ref void *spp_getpage(void)
{
	void *ptr;

	if (after_bootmem)
		ptr = (void *) get_zeroed_page(GFP_ATOMIC);
	else
		ptr = alloc_bootmem_pages(PAGE_SIZE);

	if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
		panic("set_pte_phys: cannot allocate page data %s\n",
			after_bootmem ? "after bootmem" : "");
	}

	pr_debug("spp_getpage %p\n", ptr);

	return ptr;
}

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Marcin Ślusarz
1
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Ingo Molnar
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1
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Andrew Morton
1
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static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr)
{
	if (pgd_none(*pgd)) {
		p4d_t *p4d = (p4d_t *)spp_getpage();
		pgd_populate(&init_mm, pgd, p4d);
		if (p4d != p4d_offset(pgd, 0))
			printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
			       p4d, p4d_offset(pgd, 0));
	}
	return p4d_offset(pgd, vaddr);
}

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59
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Tejun Heo
14
17.50%
1
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Andi Kleen
5
6.25%
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Eduardo Pereira Habkost
2
2.50%
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static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr)
{
	if (p4d_none(*p4d)) {
		pud_t *pud = (pud_t *)spp_getpage();
		p4d_populate(&init_mm, p4d, pud);
		if (pud != pud_offset(p4d, 0))
			printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
			       pud, pud_offset(p4d, 0));
	}
	return pud_offset(p4d, vaddr);
}

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47
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Andi Kleen
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static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
{
	if (pud_none(*pud)) {
		pmd_t *pmd = (pmd_t *) spp_getpage();
		pud_populate(&init_mm, pud, pmd);
		if (pmd != pmd_offset(pud, 0))
			printk(KERN_ERR "PAGETABLE BUG #02! %p <-> %p\n",
			       pmd, pmd_offset(pud, 0));
	}
	return pmd_offset(pud, vaddr);
}

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Tejun Heo
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Jeremy Fitzhardinge
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Ingo Molnar
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Kirill A. Shutemov
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static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
{
	if (pmd_none(*pmd)) {
		pte_t *pte = (pte_t *) spp_getpage();
		pmd_populate_kernel(&init_mm, pmd, pte);
		if (pte != pte_offset_kernel(pmd, 0))
			printk(KERN_ERR "PAGETABLE BUG #03!\n");
	}
	return pte_offset_kernel(pmd, vaddr);
}

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36.62%
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Jeremy Fitzhardinge
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5.63%
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Ingo Molnar
1
1.41%
1
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Kirill A. Shutemov
1
1.41%
1
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static void __set_pte_vaddr(pud_t *pud, unsigned long vaddr, pte_t new_pte)
{
	pmd_t *pmd = fill_pmd(pud, vaddr);
	pte_t *pte = fill_pte(pmd, vaddr);

	set_pte(pte, new_pte);

	/*
         * It's enough to flush this one mapping.
         * (PGE mappings get flushed as well)
         */
	__flush_tlb_one_kernel(vaddr);
}

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Andrew Lutomirski
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void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte)
{
	p4d_t *p4d = p4d_page + p4d_index(vaddr);
	pud_t *pud = fill_pud(p4d, vaddr);

	__set_pte_vaddr(pud, vaddr, new_pte);
}

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void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
{
	pud_t *pud = pud_page + pud_index(vaddr);

	__set_pte_vaddr(pud, vaddr, new_pte);
}

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void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
	pgd_t *pgd;
	p4d_t *p4d_page;

	pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));

	pgd = pgd_offset_k(vaddr);
	if (pgd_none(*pgd)) {
		printk(KERN_ERR
			"PGD FIXMAP MISSING, it should be setup in head.S!\n");
		return;
	}

	p4d_page = p4d_offset(pgd, 0);
	set_pte_vaddr_p4d(p4d_page, vaddr, pteval);
}

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pmd_t * __init populate_extra_pmd(unsigned long vaddr)
{
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;

	pgd = pgd_offset_k(vaddr);
	p4d = fill_p4d(pgd, vaddr);
	pud = fill_pud(p4d, vaddr);
	return fill_pmd(pud, vaddr);
}

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pte_t * __init populate_extra_pte(unsigned long vaddr)
{
	pmd_t *pmd;

	pmd = populate_extra_pmd(vaddr);
	return fill_pte(pmd, vaddr);
}

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/*
 * Create large page table mappings for a range of physical addresses.
 */


static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
					enum page_cache_mode cache)
{
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pgprot_t prot;

	pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
		pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache)));
	BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
	for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
		pgd = pgd_offset_k((unsigned long)__va(phys));
		if (pgd_none(*pgd)) {
			p4d = (p4d_t *) spp_getpage();
			set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE |
						_PAGE_USER));
		}
		p4d = p4d_offset(pgd, (unsigned long)__va(phys));
		if (p4d_none(*p4d)) {
			pud = (pud_t *) spp_getpage();
			set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE |
						_PAGE_USER));
		}
		pud = pud_offset(p4d, (unsigned long)__va(phys));
		if (pud_none(*pud)) {
			pmd = (pmd_t *) spp_getpage();
			set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
						_PAGE_USER));
		}
		pmd = pmd_offset(pud, phys);
		BUG_ON(!pmd_none(*pmd));
		set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
	}
}

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void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
{
	__init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
}

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void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
{
	__init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
}

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/*
 * The head.S code sets up the kernel high mapping:
 *
 *   from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
 *
 * phys_base holds the negative offset to the kernel, which is added
 * to the compile time generated pmds. This results in invalid pmds up
 * to the point where we hit the physaddr 0 mapping.
 *
 * We limit the mappings to the region from _text to _brk_end.  _brk_end
 * is rounded up to the 2MB boundary. This catches the invalid pmds as
 * well, as they are located before _text:
 */


void __init cleanup_highmap(void)
{
	unsigned long vaddr = __START_KERNEL_map;
	unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
	unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
	pmd_t *pmd = level2_kernel_pgt;

	/*
         * Native path, max_pfn_mapped is not set yet.
         * Xen has valid max_pfn_mapped set in
         *      arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
         */
	if (max_pfn_mapped)
		vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);

	for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
		if (pmd_none(*pmd))
			continue;
		if (vaddr < (unsigned long) _text || vaddr > end)
			set_pmd(pmd, __pmd(0));
	}
}

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Joerg Roedel
1
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/*
 * Create PTE level page table mapping for physical addresses.
 * It returns the last physical address mapped.
 */

static unsigned long __meminit

phys_pte_init(pte_t *pte_page, unsigned long paddr, unsigned long paddr_end,
	      pgprot_t prot)
{
	unsigned long pages = 0, paddr_next;
	unsigned long paddr_last = paddr_end;
	pte_t *pte;
	int i;

	pte = pte_page + pte_index(paddr);
	i = pte_index(paddr);

	for (; i < PTRS_PER_PTE; i++, paddr = paddr_next, pte++) {
		paddr_next = (paddr & PAGE_MASK) + PAGE_SIZE;
		if (paddr >= paddr_end) {
			if (!after_bootmem &&
			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
					     E820_TYPE_RAM) &&
			    !e820__mapped_any(paddr & PAGE_MASK, paddr_next,
					     E820_TYPE_RESERVED_KERN))
				set_pte(pte, __pte(0));
			continue;
		}

		/*
                 * We will re-use the existing mapping.
                 * Xen for example has some special requirements, like mapping
                 * pagetable pages as RO. So assume someone who pre-setup
                 * these mappings are more intelligent.
                 */
		if (!pte_none(*pte)) {
			if (!after_bootmem)
				pages++;
			continue;
		}

		if (0)
			pr_info("   pte=%p addr=%lx pte=%016lx\n", pte, paddr,
				pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL).pte);
		pages++;
		set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, prot));
		paddr_last = (paddr & PAGE_MASK) + PAGE_SIZE;
	}

	update_page_count(PG_LEVEL_4K, pages);

	return paddr_last;
}

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Suresh B. Siddha
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Jan Beulich
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Ingo Molnar
4
1.83%
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Dave Hansen
2
0.91%
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Andi Kleen
1
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/*
 * Create PMD level page table mapping for physical addresses. The virtual
 * and physical address have to be aligned at this level.
 * It returns the last physical address mapped.
 */

static unsigned long __meminit

phys_pmd_init(pmd_t *pmd_page, unsigned long paddr, unsigned long paddr_end,
	      unsigned long page_size_mask, pgprot_t prot)
{
	unsigned long pages = 0, paddr_next;
	unsigned long paddr_last = paddr_end;

	int i = pmd_index(paddr);

	for (; i < PTRS_PER_PMD; i++, paddr = paddr_next) {
		pmd_t *pmd = pmd_page + pmd_index(paddr);
		pte_t *pte;
		pgprot_t new_prot = prot;

		paddr_next = (paddr & PMD_MASK) + PMD_SIZE;
		if (paddr >= paddr_end) {
			if (!after_bootmem &&
			    !e820__mapped_any(paddr & PMD_MASK, paddr_next,
					     E820_TYPE_RAM) &&
			    !e820__mapped_any(paddr & PMD_MASK, paddr_next,
					     E820_TYPE_RESERVED_KERN))
				set_pmd(pmd, __pmd(0));
			continue;
		}

		if (!pmd_none(*pmd)) {
			if (!pmd_large(*pmd)) {
				spin_lock(&init_mm.page_table_lock);
				pte = (pte_t *)pmd_page_vaddr(*pmd);
				paddr_last = phys_pte_init(pte, paddr,
							   paddr_end, prot);
				spin_unlock(&init_mm.page_table_lock);
				continue;
			}
			/*
                         * If we are ok with PG_LEVEL_2M mapping, then we will
                         * use the existing mapping,
                         *
                         * Otherwise, we will split the large page mapping but
                         * use the same existing protection bits except for
                         * large page, so that we don't violate Intel's TLB
                         * Application note (317080) which says, while changing
                         * the page sizes, new and old translations should
                         * not differ with respect to page frame and
                         * attributes.
                         */
			if (page_size_mask & (1 << PG_LEVEL_2M)) {
				if (!after_bootmem)
					pages++;
				paddr_last = paddr_next;
				continue;
			}
			new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
		}

		if (page_size_mask & (1<<PG_LEVEL_2M)) {
			pages++;
			spin_lock(&init_mm.page_table_lock);
			set_pte((pte_t *)pmd,
				pfn_pte((paddr & PMD_MASK) >> PAGE_SHIFT,
					__pgprot(pgprot_val(prot) | _PAGE_PSE)));
			spin_unlock(&init_mm.page_table_lock);
			paddr_last = paddr_next;
			continue;
		}

		pte = alloc_low_page();
		paddr_last = phys_pte_init(pte, paddr, paddr_end, new_prot);

		spin_lock(&init_mm.page_table_lock);
		pmd_populate_kernel(&init_mm, pmd, pte);
		spin_unlock(&init_mm.page_table_lock);
	}
	update_page_count(PG_LEVEL_2M, pages);
	return paddr_last;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
72
19.57%
6
21.43%
Yinghai Lu
68
18.48%
7
25.00%
Jan Beulich
67
18.21%
4
14.29%
Jeremy Fitzhardinge
49
13.32%
2
7.14%
Suresh B. Siddha
44
11.96%
1
3.57%
Thomas Garnier
29
7.88%
1
3.57%
Keith Mannthey
24
6.52%
1
3.57%
Matt Tolentino
5
1.36%
1
3.57%
Ingo Molnar
4
1.09%
2
7.14%
Hugh Dickins
3
0.82%
1
3.57%
Dave Hansen
2
0.54%
1
3.57%
Thomas Gleixner
1
0.27%
1
3.57%
Total
368
100.00%
28
100.00%

/*
 * Create PUD level page table mapping for physical addresses. The virtual
 * and physical address do not have to be aligned at this level. KASLR can
 * randomize virtual addresses up to this level.
 * It returns the last physical address mapped.
 */

static unsigned long __meminit

phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
	      unsigned long page_size_mask)
{
	unsigned long pages = 0, paddr_next;
	unsigned long paddr_last = paddr_end;
	unsigned long vaddr = (unsigned long)__va(paddr);
	int i = pud_index(vaddr);

	for (; i < PTRS_PER_PUD; i++, paddr = paddr_next) {
		pud_t *pud;
		pmd_t *pmd;
		pgprot_t prot = PAGE_KERNEL;

		vaddr = (unsigned long)__va(paddr);
		pud = pud_page + pud_index(vaddr);
		paddr_next = (paddr & PUD_MASK) + PUD_SIZE;

		if (paddr >= paddr_end) {
			if (!after_bootmem &&
			    !e820__mapped_any(paddr & PUD_MASK, paddr_next,
					     E820_TYPE_RAM) &&
			    !e820__mapped_any(paddr & PUD_MASK, paddr_next,
					     E820_TYPE_RESERVED_KERN))
				set_pud(pud, __pud(0));
			continue;
		}

		if (!pud_none(*pud)) {
			if (!pud_large(*pud)) {
				pmd = pmd_offset(pud, 0);
				paddr_last = phys_pmd_init(pmd, paddr,
							   paddr_end,
							   page_size_mask,
							   prot);
				__flush_tlb_all();
				continue;
			}
			/*
                         * If we are ok with PG_LEVEL_1G mapping, then we will
                         * use the existing mapping.
                         *
                         * Otherwise, we will split the gbpage mapping but use
                         * the same existing protection  bits except for large
                         * page, so that we don't violate Intel's TLB
                         * Application note (317080) which says, while changing
                         * the page sizes, new and old translations should
                         * not differ with respect to page frame and
                         * attributes.
                         */
			if (page_size_mask & (1 << PG_LEVEL_1G)) {
				if (!after_bootmem)
					pages++;
				paddr_last = paddr_next;
				continue;
			}
			prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
		}

		if (page_size_mask & (1<<PG_LEVEL_1G)) {
			pages++;
			spin_lock(&init_mm.page_table_lock);
			set_pte((pte_t *)pud,
				pfn_pte((paddr & PUD_MASK) >> PAGE_SHIFT,
					PAGE_KERNEL_LARGE));
			spin_unlock(&init_mm.page_table_lock);
			paddr_last = paddr_next;
			continue;
		}

		pmd = alloc_low_page();
		paddr_last = phys_pmd_init(pmd, paddr, paddr_end,
					   page_size_mask, prot);

		spin_lock(&init_mm.page_table_lock);
		pud_populate(&init_mm, pud, pmd);
		spin_unlock(&init_mm.page_table_lock);
	}
	__flush_tlb_all();

	update_page_count(PG_LEVEL_1G, pages);

	return paddr_last;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Matt Tolentino
78
20.86%
1
4.00%
Andi Kleen
62
16.58%
5
20.00%
Thomas Garnier
58
15.51%
2
8.00%
Yinghai Lu
52
13.90%
6
24.00%
Jan Beulich
44
11.76%
3
12.00%
Suresh B. Siddha
38
10.16%
2
8.00%
Keith Mannthey
24
6.42%
1
4.00%
Jeremy Fitzhardinge
12
3.21%
2
8.00%
Ingo Molnar
4
1.07%
2
8.00%
Dave Hansen
2
0.53%
1
4.00%
Total
374
100.00%
25
100.00%


static unsigned long __meminit

phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
	      unsigned long page_size_mask)
{
	unsigned long paddr_next, paddr_last = paddr_end;
	unsigned long vaddr = (unsigned long)__va(paddr);
	int i = p4d_index(vaddr);

	if (!pgtable_l5_enabled())
		return phys_pud_init((pud_t *) p4d_page, paddr, paddr_end, page_size_mask);

	for (; i < PTRS_PER_P4D; i++, paddr = paddr_next) {
		p4d_t *p4d;
		pud_t *pud;

		vaddr = (unsigned long)__va(paddr);
		p4d = p4d_page + p4d_index(vaddr);
		paddr_next = (paddr & P4D_MASK) + P4D_SIZE;

		if (paddr >= paddr_end) {
			if (!after_bootmem &&
			    !e820__mapped_any(paddr & P4D_MASK, paddr_next,
					     E820_TYPE_RAM) &&
			    !e820__mapped_any(paddr & P4D_MASK, paddr_next,
					     E820_TYPE_RESERVED_KERN))
				set_p4d(p4d, __p4d(0));
			continue;
		}

		if (!p4d_none(*p4d)) {
			pud = pud_offset(p4d, 0);
			paddr_last = phys_pud_init(pud, paddr,
					paddr_end,
					page_size_mask);
			__flush_tlb_all();
			continue;
		}

		pud = alloc_low_page();
		paddr_last = phys_pud_init(pud, paddr, paddr_end,
					   page_size_mask);

		spin_lock(&init_mm.page_table_lock);
		p4d_populate(&init_mm, p4d, pud);
		spin_unlock(&init_mm.page_table_lock);
	}
	__flush_tlb_all();

	return paddr_last;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kirill A. Shutemov
220
83.33%
4
28.57%
Pekka J Enberg
19
7.20%
1
7.14%
Matt Tolentino
7
2.65%
1
7.14%
Thomas Garnier
6
2.27%
1
7.14%
Yinghai Lu
5
1.89%
2
14.29%
Andi Kleen
4
1.52%
3
21.43%
Suresh B. Siddha
2
0.76%
1
7.14%
David Shaohua Li
1
0.38%
1
7.14%
Total
264
100.00%
14
100.00%

/*
 * Create page table mapping for the physical memory for specific physical
 * addresses. The virtual and physical addresses have to be aligned on PMD level
 * down. It returns the last physical address mapped.
 */

unsigned long __meminit

kernel_physical_mapping_init(unsigned long paddr_start,
			     unsigned long paddr_end,
			     unsigned long page_size_mask)
{
	bool pgd_changed = false;
	unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;

	paddr_last = paddr_end;
	vaddr = (unsigned long)__va(paddr_start);
	vaddr_end = (unsigned long)__va(paddr_end);
	vaddr_start = vaddr;

	for (; vaddr < vaddr_end; vaddr = vaddr_next) {
		pgd_t *pgd = pgd_offset_k(vaddr);
		p4d_t *p4d;

		vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;

		if (pgd_val(*pgd)) {
			p4d = (p4d_t *)pgd_page_vaddr(*pgd);
			paddr_last = phys_p4d_init(p4d, __pa(vaddr),
						   __pa(vaddr_end),
						   page_size_mask);
			continue;
		}

		p4d = alloc_low_page();
		paddr_last = phys_p4d_init(p4d, __pa(vaddr), __pa(vaddr_end),
					   page_size_mask);

		spin_lock(&init_mm.page_table_lock);
		if (pgtable_l5_enabled())
			pgd_populate(&init_mm, pgd, p4d);
		else
			p4d_populate(&init_mm, p4d_offset(pgd, vaddr), (pud_t *) p4d);
		spin_unlock(&init_mm.page_table_lock);
		pgd_changed = true;
	}

	if (pgd_changed)
		sync_global_pgds(vaddr_start, vaddr_end - 1);

	__flush_tlb_all();

	return paddr_last;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kirill A. Shutemov
49
20.25%
4
13.79%
Thomas Garnier
34
14.05%
1
3.45%
Andi Kleen
34
14.05%
7
24.14%
Yinghai Lu
31
12.81%
7
24.14%
Pekka J Enberg
31
12.81%
1
3.45%
Haicheng Li
19
7.85%
1
3.45%
Jeremy Fitzhardinge
17
7.02%
2
6.90%
Matt Tolentino
13
5.37%
1
3.45%
Jan Beulich
7
2.89%
1
3.45%
Wen Congyang
2
0.83%
1
3.45%
Fengguang Wu
2
0.83%
1
3.45%
Suresh B. Siddha
2
0.83%
1
3.45%
David Shaohua Li
1
0.41%
1
3.45%
Total
242
100.00%
29
100.00%

#ifndef CONFIG_NUMA


void __init initmem_init(void)
{
	memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
13
59.09%
2
33.33%
Tang Chen
5
22.73%
1
16.67%
Tejun Heo
3
13.64%
2
33.33%
Stefan Agner
1
4.55%
1
16.67%
Total
22
100.00%
6
100.00%

#endif



void __init paging_init(void)
{
	sparse_memory_present_with_active_regions(MAX_NUMNODES);
	sparse_init();

	/*
         * clear the default setting with node 0
         * note: don't use nodes_clear here, that is really clearing when
         *       numa support is not compiled in, and later node_set_state
         *       will not set it back.
         */
	node_clear_state(0, N_MEMORY);
	if (N_MEMORY != N_NORMAL_MEMORY)
		node_clear_state(0, N_NORMAL_MEMORY);

	zone_sizes_init();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lai Jiangshan
13
32.50%
1
12.50%
Andi Kleen
9
22.50%
2
25.00%
Yinghai Lu
8
20.00%
2
25.00%
Pekka J Enberg
7
17.50%
2
25.00%
Matt Tolentino
3
7.50%
1
12.50%
Total
40
100.00%
8
100.00%

/*
 * Memory hotplug specific functions
 */
#ifdef CONFIG_MEMORY_HOTPLUG
/*
 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
 * updating.
 */


static void update_end_of_memory_vars(u64 start, u64 size)
{
	unsigned long end_pfn = PFN_UP(start + size);

	if (end_pfn > max_pfn) {
		max_pfn = end_pfn;
		max_low_pfn = end_pfn;
		high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Shaohui Zheng
56
100.00%
1
100.00%
Total
56
100.00%
1
100.00%



int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
		struct vmem_altmap *altmap, bool want_memblock)
{
	int ret;

	ret = __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
	WARN_ON_ONCE(ret);

	/* update max_pfn, max_low_pfn and high_memory */
	update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
				  nr_pages << PAGE_SHIFT);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Michal Hocko
55
88.71%
1
50.00%
Christoph Hellwig
7
11.29%
1
50.00%
Total
62
100.00%
2
100.00%



int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
		bool want_memblock)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;

	init_memory_mapping(start, start + size);

	return add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Matt Tolentino
32
52.46%
1
11.11%
Keith Mannthey
9
14.75%
1
11.11%
Christoph Hellwig
7
11.48%
1
11.11%
Michal Hocko
5
8.20%
3
33.33%
Yasunori Goto
4
6.56%
1
11.11%
Dan J Williams
2
3.28%
1
11.11%
Gary Hade
2
3.28%
1
11.11%
Total
61
100.00%
9
100.00%


#define PAGE_INUSE 0xFD



static void __meminit free_pagetable(struct page *page, int order)
{
	unsigned long magic;
	unsigned int nr_pages = 1 << order;

	/* bootmem page has reserved flag */
	if (PageReserved(page)) {
		__ClearPageReserved(page);

		magic = (unsigned long)page->freelist;
		if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
			while (nr_pages--)
				put_page_bootmem(page++);
		} else
			while (nr_pages--)
				free_reserved_page(page++);
	} else
		free_pages((unsigned long)page_address(page), order);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
94
92.16%
1
33.33%
Jiang Liu
7
6.86%
1
33.33%
Yasuaki Ishimatsu
1
0.98%
1
33.33%
Total
102
100.00%
3
100.00%



static void __meminit free_hugepage_table(struct page *page,
		struct vmem_altmap *altmap)
{
	if (altmap)
		vmem_altmap_free(altmap, PMD_SIZE / PAGE_SIZE);
	else
		free_pagetable(page, get_order(PMD_SIZE));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Dan J Williams
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%



static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
{
	pte_t *pte;
	int i;

	for (i = 0; i < PTRS_PER_PTE; i++) {
		pte = pte_start + i;
		if (!pte_none(*pte))
			return;
	}

	/* free a pte talbe */
	free_pagetable(pmd_page(*pmd), 0);
	spin_lock(&init_mm.page_table_lock);
	pmd_clear(pmd);
	spin_unlock(&init_mm.page_table_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kirill A. Shutemov
81
94.19%
1
50.00%
Wen Congyang
5
5.81%
1
50.00%
Total
86
100.00%
2
100.00%



static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
{
	pmd_t *pmd;
	int i;

	for (i = 0; i < PTRS_PER_PMD; i++) {
		pmd = pmd_start + i;
		if (!pmd_none(*pmd))
			return;
	}

	/* free a pmd talbe */
	free_pagetable(pud_page(*pud), 0);
	spin_lock(&init_mm.page_table_lock);
	pud_clear(pud);
	spin_unlock(&init_mm.page_table_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
64
74.42%
1
33.33%
Kirill A. Shutemov
21
24.42%
1
33.33%
Dave Hansen
1
1.16%
1
33.33%
Total
86
100.00%
3
100.00%



static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
{
	pud_t *pud;
	int i;

	for (i = 0; i < PTRS_PER_PUD; i++) {
		pud = pud_start + i;
		if (!pud_none(*pud))
			return;
	}

	/* free a pud talbe */
	free_pagetable(p4d_page(*p4d), 0);
	spin_lock(&init_mm.page_table_lock);
	p4d_clear(p4d);
	spin_unlock(&init_mm.page_table_lock);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
68
79.07%
1
33.33%
Kirill A. Shutemov
17
19.77%
1
33.33%
Dave Hansen
1
1.16%
1
33.33%
Total
86
100.00%
3
100.00%


static void __meminit

remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
		 bool direct)
{
	unsigned long next, pages = 0;
	pte_t *pte;
	void *page_addr;
	phys_addr_t phys_addr;

	pte = pte_start + pte_index(addr);
	for (; addr < end; addr = next, pte++) {
		next = (addr + PAGE_SIZE) & PAGE_MASK;
		if (next > end)
			next = end;

		if (!pte_present(*pte))
			continue;

		/*
                 * We mapped [0,1G) memory as identity mapping when
                 * initializing, in arch/x86/kernel/head_64.S. These
                 * pagetables cannot be removed.
                 */
		phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
		if (phys_addr < (phys_addr_t)0x40000000)
			return;

		if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) {
			/*
                         * Do not free direct mapping pages since they were
                         * freed when offlining, or simplely not in use.
                         */
			if (!direct)
				free_pagetable(pte_page(*pte), 0);

			spin_lock(&init_mm.page_table_lock);
			pte_clear(&init_mm, addr, pte);
			spin_unlock(&init_mm.page_table_lock);

			/* For non-direct mapping, pages means nothing. */
			pages++;
		} else {
			/*
                         * If we are here, we are freeing vmemmap pages since
                         * direct mapped memory ranges to be freed are aligned.
                         *
                         * If we are not removing the whole page, it means
                         * other page structs in this page are being used and
                         * we canot remove them. So fill the unused page_structs
                         * with 0xFD, and remove the page when it is wholly
                         * filled with 0xFD.
                         */
			memset((void *)addr, PAGE_INUSE, next - addr);

			page_addr = page_address(pte_page(*pte));
			if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
				free_pagetable(pte_page(*pte), 0);

				spin_lock(&init_mm.page_table_lock);
				pte_clear(&init_mm, addr, pte);
				spin_unlock(&init_mm.page_table_lock);
			}
		}
	}

	/* Call free_pte_table() in remove_pmd_table(). */
	flush_tlb_all();
	if (direct)
		update_page_count(PG_LEVEL_4K, -pages);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
277
99.28%
1
50.00%
Kefeng Wang
2
0.72%
1
50.00%
Total
279
100.00%
2
100.00%


static void __meminit

remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
		 bool direct, struct vmem_altmap *altmap)
{
	unsigned long next, pages = 0;
	pte_t *pte_base;
	pmd_t *pmd;
	void *page_addr;

	pmd = pmd_start + pmd_index(addr);
	for (; addr < end; addr = next, pmd++) {
		next = pmd_addr_end(addr, end);

		if (!pmd_present(*pmd))
			continue;

		if (pmd_large(*pmd)) {
			if (IS_ALIGNED(addr, PMD_SIZE) &&
			    IS_ALIGNED(next, PMD_SIZE)) {
				if (!direct)
					free_hugepage_table(pmd_page(*pmd),
							    altmap);

				spin_lock(&init_mm.page_table_lock);
				pmd_clear(pmd);
				spin_unlock(&init_mm.page_table_lock);
				pages++;
			} else {
				/* If here, we are freeing vmemmap pages. */
				memset((void *)addr, PAGE_INUSE, next - addr);

				page_addr = page_address(pmd_page(*pmd));
				if (!memchr_inv(page_addr, PAGE_INUSE,
						PMD_SIZE)) {
					free_hugepage_table(pmd_page(*pmd),
							    altmap);

					spin_lock(&init_mm.page_table_lock);
					pmd_clear(pmd);
					spin_unlock(&init_mm.page_table_lock);
				}
			}

			continue;
		}

		pte_base = (pte_t *)pmd_page_vaddr(*pmd);
		remove_pte_table(pte_base, addr, next, direct);
		free_pte_table(pte_base, pmd);
	}

	/* Call free_pmd_table() in remove_pud_table(). */
	if (direct)
		update_page_count(PG_LEVEL_2M, -pages);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
270
96.77%
1
33.33%
Christoph Hellwig
7
2.51%
1
33.33%
Dan J Williams
2
0.72%
1
33.33%
Total
279
100.00%
3
100.00%


static void __meminit

remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
		 struct vmem_altmap *altmap, bool direct)
{
	unsigned long next, pages = 0;
	pmd_t *pmd_base;
	pud_t *pud;
	void *page_addr;

	pud = pud_start + pud_index(addr);
	for (; addr < end; addr = next, pud++) {
		next = pud_addr_end(addr, end);

		if (!pud_present(*pud))
			continue;

		if (pud_large(*pud)) {
			if (IS_ALIGNED(addr, PUD_SIZE) &&
			    IS_ALIGNED(next, PUD_SIZE)) {
				if (!direct)
					free_pagetable(pud_page(*pud),
						       get_order(PUD_SIZE));

				spin_lock(&init_mm.page_table_lock);
				pud_clear(pud);
				spin_unlock(&init_mm.page_table_lock);
				pages++;
			} else {
				/* If here, we are freeing vmemmap pages. */
				memset((void *)addr, PAGE_INUSE, next - addr);

				page_addr = page_address(pud_page(*pud));
				if (!memchr_inv(page_addr, PAGE_INUSE,
						PUD_SIZE)) {
					free_pagetable(pud_page(*pud),
						       get_order(PUD_SIZE));

					spin_lock(&init_mm.page_table_lock);
					pud_clear(pud);
					spin_unlock(&init_mm.page_table_lock);
				}
			}

			continue;
		}

		pmd_base = pmd_offset(pud, 0);
		remove_pmd_table(pmd_base, addr, next, direct, altmap);
		free_pmd_table(pmd_base, pud);
	}

	if (direct)
		update_page_count(PG_LEVEL_1G, -pages);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
273
96.47%
1
33.33%
Christoph Hellwig
7
2.47%
1
33.33%
Kirill A. Shutemov
3
1.06%
1
33.33%
Total
283
100.00%
3
100.00%


static void __meminit

remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
		 struct vmem_altmap *altmap, bool direct)
{
	unsigned long next, pages = 0;
	pud_t *pud_base;
	p4d_t *p4d;

	p4d = p4d_start + p4d_index(addr);
	for (; addr < end; addr = next, p4d++) {
		next = p4d_addr_end(addr, end);

		if (!p4d_present(*p4d))
			continue;

		BUILD_BUG_ON(p4d_large(*p4d));

		pud_base = pud_offset(p4d, 0);
		remove_pud_table(pud_base, addr, next, altmap, direct);
		/*
                 * For 4-level page tables we do not want to free PUDs, but in the
                 * 5-level case we should free them. This code will have to change
                 * to adapt for boot-time switching between 4 and 5 level page tables.
                 */
		if (pgtable_l5_enabled())
			free_pud_table(pud_base, p4d);
	}

	if (direct)
		update_page_count(PG_LEVEL_512G, -pages);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Kirill A. Shutemov
132
92.31%
4
66.67%
Christoph Hellwig
7
4.90%
1
16.67%
Jérôme Glisse
4
2.80%
1
16.67%
Total
143
100.00%
6
100.00%

/* start and end are both virtual address. */

static void __meminit

remove_pagetable(unsigned long start, unsigned long end, bool direct,
		struct vmem_altmap *altmap)
{
	unsigned long next;
	unsigned long addr;
	pgd_t *pgd;
	p4d_t *p4d;

	for (addr = start; addr < end; addr = next) {
		next = pgd_addr_end(addr, end);

		pgd = pgd_offset_k(addr);
		if (!pgd_present(*pgd))
			continue;

		p4d = p4d_offset(pgd, 0);
		remove_p4d_table(p4d, addr, next, altmap, direct);
	}

	flush_tlb_all();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
79
74.53%
1
20.00%
Yasuaki Ishimatsu
12
11.32%
1
20.00%
Kirill A. Shutemov
8
7.55%
2
40.00%
Christoph Hellwig
7
6.60%
1
20.00%
Total
106
100.00%
5
100.00%



void __ref vmemmap_free(unsigned long start, unsigned long end,
		struct vmem_altmap *altmap)
{
	remove_pagetable(start, end, false, altmap);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tang Chen
20
66.67%
1
33.33%
Christoph Hellwig
7
23.33%
1
33.33%
Johannes Weiner
3
10.00%
1
33.33%
Total
30
100.00%
3
100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE

static void __meminit

kernel_physical_mapping_remove(unsigned long start, unsigned long end)
{
	start = (unsigned long)__va(start);
	end = (unsigned long)__va(end);

	remove_pagetable(start, end, true, NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Tang Chen
46
95.83%
1
50.00%
Christoph Hellwig
2
4.17%
1
50.00%
Total
48
100.00%
2
100.00%



int __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
{
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	struct page *page = pfn_to_page(start_pfn);
	struct zone *zone;
	int ret;

	/* With altmap the first mapped page is offset from @start */
	if (altmap)
		page += vmem_altmap_offset(altmap);
	zone = page_zone(page);
	ret = __remove_pages(zone, start_pfn, nr_pages, altmap);
	WARN_ON_ONCE(ret);
	kernel_physical_mapping_remove(start, start + size);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
57
57.00%
1
25.00%
Dan J Williams
33
33.00%
1
25.00%
Christoph Hellwig
7
7.00%
1
25.00%
Tang Chen
3
3.00%
1
25.00%
Total
100
100.00%
4
100.00%

#endif
#endif /* CONFIG_MEMORY_HOTPLUG */


static struct kcore_list kcore_vsyscall;



static void __init register_page_bootmem_info(void)
{
#ifdef CONFIG_NUMA
	int i;

	for_each_online_node(i)
		register_page_bootmem_info_node(NODE_DATA(i));
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



void __init mem_init(void)
{
	pci_iommu_alloc();

	/* clear_bss() already clear the empty_zero_page */

	/* this will put all memory onto the freelists */
	free_all_bootmem();
	after_bootmem = 1;
	x86_init.hyper.init_after_bootmem();

	/*
         * Must be done after boot memory is put on freelist, because here we
         * might set fields in deferred struct pages that have not yet been
         * initialized, and free_all_bootmem() initializes all the reserved
         * deferred pages for us.
         */
	register_page_bootmem_info();

	/* Register memory areas for /proc/kcore */
	if (get_gate_vma(&init_mm))
		kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, PAGE_SIZE, KCORE_USER);

	mem_init_print_info(NULL);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
31
50.82%
3
21.43%
Pavel Tatashin
11
18.03%
2
14.29%
jia zhang
9
14.75%
2
14.29%
Jiang Liu
3
4.92%
2
14.29%
Andrew Lutomirski
2
3.28%
1
7.14%
Muli Ben-Yehuda
2
3.28%
1
7.14%
Kamezawa Hiroyuki
1
1.64%
1
7.14%
Yinghai Lu
1
1.64%
1
7.14%
Jon Mason
1
1.64%
1
7.14%
Total
61
100.00%
14
100.00%


int kernel_set_to_readonly;



void set_kernel_text_rw(void)
{
	unsigned long start = PFN_ALIGN(_text);
	unsigned long end = PFN_ALIGN(__stop___ex_table);

	if (!kernel_set_to_readonly)
		return;

	pr_debug("Set kernel text: %lx - %lx for read write\n",
		 start, end);

	/*
         * Make the kernel identity mapping for text RW. Kernel text
         * mapping will always be RO. Refer to the comment in
         * static_protections() in pageattr.c
         */
	set_memory_rw(start, (end - start) >> PAGE_SHIFT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
51
94.44%
1
33.33%
Suresh B. Siddha
3
5.56%
2
66.67%
Total
54
100.00%
3
100.00%



void set_kernel_text_ro(void)
{
	unsigned long start = PFN_ALIGN(_text);
	unsigned long end = PFN_ALIGN(__stop___ex_table);

	if (!kernel_set_to_readonly)
		return;

	pr_debug("Set kernel text: %lx - %lx for read only\n",
		 start, end);

	/*
         * Set the kernel identity mapping for text RO.
         */
	set_memory_ro(start, (end - start) >> PAGE_SHIFT);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Rostedt
51
94.44%
1
33.33%
Suresh B. Siddha
3
5.56%
2
66.67%
Total
54
100.00%
3
100.00%



void mark_rodata_ro(void)
{
	unsigned long start = PFN_ALIGN(_text);
	unsigned long rodata_start = PFN_ALIGN(__start_rodata);
	unsigned long end = (unsigned long) &__end_rodata_hpage_align;
	unsigned long text_end = PFN_ALIGN(&__stop___ex_table);
	unsigned long rodata_end = PFN_ALIGN(&__end_rodata);
	unsigned long all_end;

	printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
	       (end - start) >> 10);
	set_memory_ro(start, (end - start) >> PAGE_SHIFT);

	kernel_set_to_readonly = 1;

	/*
         * The rodata/data/bss/brk section (but not the kernel text!)
         * should also be not-executable.
         *
         * We align all_end to PMD_SIZE because the existing mapping
         * is a full PMD. If we would align _brk_end to PAGE_SIZE we
         * split the PMD and the reminder between _brk_end and the end
         * of the PMD will remain mapped executable.
         *
         * Any PMD which was setup after the one which covers _brk_end
         * has been zapped already via cleanup_highmem().
         */
	all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
	set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT);

#ifdef CONFIG_CPA_DEBUG
	printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
	set_memory_rw(start, (end-start) >> PAGE_SHIFT);

	printk(KERN_INFO "Testing CPA: again\n");
	set_memory_ro(start, (end-start) >> PAGE_SHIFT);
#endif

	free_init_pages("unused kernel",
			(unsigned long) __va(__pa_symbol(text_end)),
			(unsigned long) __va(__pa_symbol(rodata_start)));
	free_init_pages("unused kernel",
			(unsigned long) __va(__pa_symbol(rodata_end)),
			(unsigned long) __va(__pa_symbol(_sdata)));

	debug_checkwx();

	/*
         * Do this after all of the manipulation of the
         * kernel text page tables are complete.
         */
	pti_clone_kernel_text();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Suresh B. Siddha
80
34.78%
2
10.53%
Andi Kleen
43
18.70%
1
5.26%
Arjan van de Ven
38
16.52%
3
15.79%
Kees Cook
14
6.09%
1
5.26%
Alexander Duyck
14
6.09%
1
5.26%
Steven Rostedt
10
4.35%
2
10.53%
Linus Torvalds
8
3.48%
1
5.26%
Stephen D. Smalley
5
2.17%
2
10.53%
Jan Beulich
4
1.74%
1
5.26%
Mathieu Desnoyers
4
1.74%
1
5.26%
Dave Hansen
4
1.74%
1
5.26%
Jiang Liu
2
0.87%
1
5.26%
Ingo Molnar
2
0.87%
1
5.26%
Yinghai Lu
2
0.87%
1
5.26%
Total
230
100.00%
19
100.00%



int kern_addr_valid(unsigned long addr)
{
	unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	if (above != 0 && above != -1UL)
		return 0;

	pgd = pgd_offset_k(addr);
	if (pgd_none(*pgd))
		return 0;

	p4d = p4d_offset(pgd, addr);
	if (p4d_none(*p4d))
		return 0;

	pud = pud_offset(p4d, addr);
	if (pud_none(*pud))
		return 0;

	if (pud_large(*pud))
		return pfn_valid(pud_pfn(*pud));

	pmd = pmd_offset(pud, addr);
	if (pmd_none(*pmd))
		return 0;

	if (pmd_large(*pmd))
		return pfn_valid(pmd_pfn(*pmd));

	pte = pte_offset_kernel(pmd, addr);
	if (pte_none(*pte))
		return 0;

	return pfn_valid(pte_pfn(*pte));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andi Kleen
157
78.50%
3
60.00%
Kirill A. Shutemov
25
12.50%
1
20.00%
Mel Gorman
18
9.00%
1
20.00%
Total
200
100.00%
5
100.00%

/*
 * Block size is the minimum amount of memory which can be hotplugged or
 * hotremoved. It must be power of two and must be equal or larger than
 * MIN_MEMORY_BLOCK_SIZE.
 */

#define MAX_BLOCK_SIZE (2UL << 30)

/* Amount of ram needed to start using large blocks */

#define MEM_SIZE_FOR_LARGE_BLOCK (64UL << 30)

/* Adjustable memory block size */

static unsigned long set_memory_block_size;


int __init set_memory_block_size_order(unsigned int order)
{
	unsigned long size = 1UL << order;

	if (size > MEM_SIZE_FOR_LARGE_BLOCK || size < MIN_MEMORY_BLOCK_SIZE)
		return -EINVAL;

	set_memory_block_size = size;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Travis
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%



static unsigned long probe_memory_block_size(void)
{
	unsigned long boot_mem_end = max_pfn << PAGE_SHIFT;
	unsigned long bz;

	/* If memory block size has been set, then use it */
	bz = set_memory_block_size;
	if (bz)
		goto done;

	/* Use regular block if RAM is smaller than MEM_SIZE_FOR_LARGE_BLOCK */
	if (boot_mem_end < MEM_SIZE_FOR_LARGE_BLOCK) {
		bz = MIN_MEMORY_BLOCK_SIZE;
		goto done;
	}

	/* Find the largest allowed block size that aligns to memory end */
	for (bz = MAX_BLOCK_SIZE; bz > MIN_MEMORY_BLOCK_SIZE; bz >>= 1) {
		if (IS_ALIGNED(boot_mem_end, bz))
			break;
	}
done:
	pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20);

	return bz;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Pavel Tatashin
56
62.22%
1
20.00%
Yinghai Lu
18
20.00%
1
20.00%
Nathan Fontenot
7
7.78%
1
20.00%
Mike Travis
6
6.67%
1
20.00%
Seth Jennings
3
3.33%
1
20.00%
Total
90
100.00%
5
100.00%


static unsigned long memory_block_size_probed;


unsigned long memory_block_size_bytes(void)
{
	if (!memory_block_size_probed)
		memory_block_size_probed = probe_memory_block_size();

	return memory_block_size_probed;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%

#ifdef CONFIG_SPARSEMEM_VMEMMAP
/*
 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
 */


static long __meminitdata addr_start, addr_end;


static void __meminitdata *p_start, *p_end;

static int __meminitdata node_start;



static int __meminit vmemmap_populate_hugepages(unsigned long start,
		unsigned long end, int node, struct vmem_altmap *altmap)
{
	unsigned long addr;
	unsigned long next;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;

	for (addr = start; addr < end; addr = next) {
		next = pmd_addr_end(addr, end);

		pgd = vmemmap_pgd_populate(addr, node);
		if (!pgd)
			return -ENOMEM;

		p4d = vmemmap_p4d_populate(pgd, addr, node);
		if (!p4d)
			return -ENOMEM;

		pud = vmemmap_pud_populate(p4d, addr, node);
		if (!pud)
			return -ENOMEM;

		pmd = pmd_offset(pud, addr);
		if (pmd_none(*pmd)) {
			void *p;

			if (altmap)
				p = altmap_alloc_block_buf(PMD_SIZE, altmap);
			else
				p = vmemmap_alloc_block_buf(PMD_SIZE, node);
			if (p) {
				pte_t entry;

				entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
						PAGE_KERNEL_LARGE);
				set_pmd(pmd, __pmd(pte_val(entry)));

				/* check to see if we have contiguous blocks */
				if (p_end != p || node_start != node) {
					if (p_start)
						pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
						       addr_start, addr_end-1, p_start, p_end-1, node_start);
					addr_start = addr;
					node_start = node;
					p_start = p;
				}

				addr_end = addr + PMD_SIZE;
				p_end = p + PMD_SIZE;
				continue;
			} else if (altmap)
				return -ENOMEM; /* no fallback */
		} else if (pmd_large(*pmd)) {
			vmemmap_verify((pte_t *)pmd, node, addr, next);
			continue;
		}
		if (vmemmap_populate_basepages(addr, next, node))
			return -ENOMEM;
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Lameter
160
48.78%
1
8.33%
Johannes Weiner
56
17.07%
3
25.00%
Yinghai Lu
50
15.24%
2
16.67%
Kirill A. Shutemov
25
7.62%
1
8.33%
Dan J Williams
17
5.18%
2
16.67%
Christoph Hellwig
15
4.57%
1
8.33%
Thomas Gleixner
4
1.22%
1
8.33%
Jeremy Fitzhardinge
1
0.30%
1
8.33%
Total
328
100.00%
12
100.00%



int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
		struct vmem_altmap *altmap)
{
	int err;

	if (boot_cpu_has(X86_FEATURE_PSE))
		err = vmemmap_populate_hugepages(start, end, node, altmap);
	else if (altmap) {
		pr_err_once("%s: no cpu support for altmap allocations\n",
				__func__);
		err = -ENOMEM;
	} else
		err = vmemmap_populate_basepages(start, end, node);
	if (!err)
		sync_global_pgds(start, end - 1);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Johannes Weiner
50
53.76%
2
25.00%
Dan J Williams
25
26.88%
1
12.50%
Haicheng Li
6
6.45%
1
12.50%
Borislav Petkov
4
4.30%
1
12.50%
Christoph Lameter
3
3.23%
1
12.50%
Christoph Hellwig
3
3.23%
1
12.50%
Wen Congyang
2
2.15%
1
12.50%
Total
93
100.00%
8
100.00%

#if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)


void register_page_bootmem_memmap(unsigned long section_nr,
				  struct page *start_page, unsigned long nr_pages)
{
	unsigned long addr = (unsigned long)start_page;
	unsigned long end = (unsigned long)(start_page + nr_pages);
	unsigned long next;
	pgd_t *pgd;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	unsigned int nr_pmd_pages;
	struct page *page;

	for (; addr < end; addr = next) {
		pte_t *pte = NULL;

		pgd = pgd_offset_k(addr);
		if (pgd_none(*pgd)) {
			next = (addr + PAGE_SIZE) & PAGE_MASK;
			continue;
		}
		get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);

		p4d = p4d_offset(pgd, addr);
		if (p4d_none(*p4d)) {
			next = (addr + PAGE_SIZE) & PAGE_MASK;
			continue;
		}
		get_page_bootmem(section_nr, p4d_page(*p4d), MIX_SECTION_INFO);

		pud = pud_offset(p4d, addr);
		if (pud_none(*pud)) {
			next = (addr + PAGE_SIZE) & PAGE_MASK;
			continue;
		}
		get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);

		if (!boot_cpu_has(X86_FEATURE_PSE)) {
			next = (addr + PAGE_SIZE) & PAGE_MASK;
			pmd = pmd_offset(pud, addr);
			if (pmd_none(*pmd))
				continue;
			get_page_bootmem(section_nr, pmd_page(*pmd),
					 MIX_SECTION_INFO);

			pte = pte_offset_kernel(pmd, addr);
			if (pte_none(*pte))
				continue;
			get_page_bootmem(section_nr, pte_page(*pte),
					 SECTION_INFO);
		} else {
			next = pmd_addr_end(addr, end);

			pmd = pmd_offset(pud, addr);
			if (pmd_none(*pmd))
				continue;

			nr_pmd_pages = 1 << get_order(PMD_SIZE);
			page = pmd_page(*pmd);
			while (nr_pmd_pages--)
				get_page_bootmem(section_nr, page++,
						 SECTION_INFO);
		}
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasuaki Ishimatsu
304
84.21%
1
25.00%
Kirill A. Shutemov
48
13.30%
1
25.00%
Baoquan He
5
1.39%
1
25.00%
Borislav Petkov
4
1.11%
1
25.00%
Total
361
100.00%
4
100.00%

#endif



void __meminit vmemmap_populate_print_last(void)
{
	if (p_start) {
		pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
			addr_start, addr_end-1, p_start, p_end-1, node_start);
		p_start = NULL;
		p_end = NULL;
		node_start = 0;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Yinghai Lu
44
97.78%
1
50.00%
Dan J Williams
1
2.22%
1
50.00%
Total
45
100.00%
2
100.00%

#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
1198
17.44%
3
1.59%
Kirill A. Shutemov
1165
16.96%
7
3.70%
Andi Kleen
704
10.25%
21
11.11%
Yinghai Lu
521
7.59%
26
13.76%
Yasuaki Ishimatsu
345
5.02%
4
2.12%
Jack Steiner
253
3.68%
1
0.53%
Jeremy Fitzhardinge
229
3.33%
6
3.17%
Tejun Heo
191
2.78%
5
2.65%
Suresh B. Siddha
180
2.62%
6
3.17%
Christoph Lameter
167
2.43%
1
0.53%
Thomas Garnier
164
2.39%
2
1.06%
Matt Tolentino
141
2.05%
1
0.53%
Jan Beulich
130
1.89%
5
2.65%
Haicheng Li
126
1.83%
2
1.06%
Dan J Williams
124
1.81%
4
2.12%
Steven Rostedt
115
1.67%
2
1.06%
Johannes Weiner
109
1.59%
3
1.59%
Thomas Gleixner
97
1.41%
5
2.65%
Pavel Tatashin
77
1.12%
3
1.59%
Tang Chen
77
1.12%
4
2.12%
Christoph Hellwig
76
1.11%
5
2.65%
Eduardo Pereira Habkost
67
0.98%
1
0.53%
Pekka J Enberg
62
0.90%
4
2.12%
Michal Hocko
60
0.87%
3
1.59%
Keith Mannthey
59
0.86%
2
1.06%
Shaohui Zheng
57
0.83%
1
0.53%
Mike Travis
51
0.74%
1
0.53%
Arjan van de Ven
38
0.55%
3
1.59%
Juergen Gross
29
0.42%
1
0.53%
Dave Hansen
27
0.39%
3
1.59%
Ingo Molnar
22
0.32%
6
3.17%
Baoquan He
21
0.31%
2
1.06%
Mel Gorman
18
0.26%
1
0.53%
Alexander Duyck
14
0.20%
1
0.53%
Kees Cook
14
0.20%
1
0.53%
Lai Jiangshan
13
0.19%
1
0.53%
Linus Torvalds
13
0.19%
3
1.59%
Jiang Liu
12
0.17%
4
2.12%
Nathan Fontenot
11
0.16%
1
0.53%
jia zhang
9
0.13%
2
1.06%
Borislav Petkov
8
0.12%
1
0.53%
Yasunori Goto
7
0.10%
1
0.53%
Seth Jennings
6
0.09%
1
0.53%
Stephen D. Smalley
5
0.07%
2
1.06%
Muli Ben-Yehuda
5
0.07%
1
0.53%
Hugh Dickins
4
0.06%
2
1.06%
Mathieu Desnoyers
4
0.06%
1
0.53%
Jérôme Glisse
4
0.06%
1
0.53%
Konrad Rzeszutek Wilk
3
0.04%
1
0.53%
Randy Dunlap
3
0.04%
1
0.53%
Andrea Arcangeli
3
0.04%
1
0.53%
David Howells
3
0.04%
1
0.53%
Benjamin Herrenschmidt
3
0.04%
1
0.53%
Andrew Lutomirski
3
0.04%
2
1.06%
Fengguang Wu
2
0.03%
1
0.53%
Kefeng Wang
2
0.03%
1
0.53%
Harvey Harrison
2
0.03%
1
0.53%
Marcin Ślusarz
2
0.03%
1
0.53%
David Shaohua Li
2
0.03%
1
0.53%
Gary Hade
2
0.03%
1
0.53%
Pavel Machek
1
0.01%
1
0.53%
Kamezawa Hiroyuki
1
0.01%
1
0.53%
David Vrabel
1
0.01%
1
0.53%
Jon Mason
1
0.01%
1
0.53%
Stefan Agner
1
0.01%
1
0.53%
Andrew Morton
1
0.01%
1
0.53%
Laura Abbott
1
0.01%
1
0.53%
Joerg Roedel
1
0.01%
1
0.53%
Zhang Yanfei
1
0.01%
1
0.53%
Total
6868
100.00%
189
100.00%
Directory: arch/x86/mm

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