Release 4.11 arch/ia64/mm/init.c

/*
 * Initialize MMU support.
 *
 * Copyright (C) 1998-2003 Hewlett-Packard Co
 *      David Mosberger-Tang <davidm@hpl.hp.com>
 */
#include <linux/kernel.h>
#include <linux/init.h>

#include <linux/bootmem.h>
#include <linux/efi.h>
#include <linux/elf.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/mmzone.h>
#include <linux/module.h>
#include <linux/personality.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/bitops.h>
#include <linux/kexec.h>

#include <asm/dma.h>
#include <asm/io.h>
#include <asm/machvec.h>
#include <asm/numa.h>
#include <asm/patch.h>
#include <asm/pgalloc.h>
#include <asm/sal.h>
#include <asm/sections.h>
#include <asm/tlb.h>
#include <linux/uaccess.h>
#include <asm/unistd.h>
#include <asm/mca.h>

extern void ia64_tlb_init (void);


unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;

#ifdef CONFIG_VIRTUAL_MEM_MAP

unsigned long VMALLOC_END = VMALLOC_END_INIT;

EXPORT_SYMBOL(VMALLOC_END);

struct page *vmem_map;

EXPORT_SYMBOL(vmem_map);
#endif


struct page *zero_page_memmap_ptr;	
/* map entry for zero page */

EXPORT_SYMBOL(zero_page_memmap_ptr);


void

__ia64_sync_icache_dcache (pte_t pte)
{
	unsigned long addr;
	struct page *page;

	page = pte_page(pte);
	addr = (unsigned long) page_address(page);

	if (test_bit(PG_arch_1, &page->flags))
		return;				/* i-cache is already coherent with d-cache */

	flush_icache_range(addr, addr + (PAGE_SIZE << compound_order(page)));
	set_bit(PG_arch_1, &page->flags);	/* mark page as clean */
}

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David Mosberger-Tang
62
81.58%
1
25.00%
Yanmin Zhang
8
10.53%
1
25.00%
Christoph Lameter
5
6.58%
1
25.00%
Kamezawa Hiroyuki
1
1.32%
1
25.00%
Total
76
100.00%
4
100.00%

/*
 * Since DMA is i-cache coherent, any (complete) pages that were written via
 * DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
 * flush them when they get mapped into an executable vm-area.
 */

void

dma_mark_clean(void *addr, size_t size)
{
	unsigned long pg_addr, end;

	pg_addr = PAGE_ALIGN((unsigned long) addr);
	end = (unsigned long) addr + size;
	while (pg_addr + PAGE_SIZE <= end) {
		struct page *page = virt_to_page(pg_addr);
		set_bit(PG_arch_1, &page->flags);
		pg_addr += PAGE_SIZE;
	}
}

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Jan Beulich
73
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73
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1
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inline void

ia64_set_rbs_bot (void)
{
	unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16;

	if (stack_size > MAX_USER_STACK_SIZE)
		stack_size = MAX_USER_STACK_SIZE;
	current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
}

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Martin Hicks
36
76.60%
1
33.33%
Kamezawa Hiroyuki
8
17.02%
1
33.33%
Jiri Slaby
3
6.38%
1
33.33%
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47
100.00%
3
100.00%

/*
 * This performs some platform-dependent address space initialization.
 * On IA-64, we want to setup the VM area for the register backing
 * store (which grows upwards) and install the gateway page which is
 * used for signal trampolines, etc.
 */

void

ia64_init_addr_space (void)
{
	struct vm_area_struct *vma;

	ia64_set_rbs_bot();

	/*
         * If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
         * the problem.  When the process attempts to write to the register backing store
         * for the first time, it will get a SEGFAULT in this case.
         */
	vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
	if (vma) {
		INIT_LIST_HEAD(&vma->anon_vma_chain);
		vma->vm_mm = current->mm;
		vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
		vma->vm_end = vma->vm_start + PAGE_SIZE;
		vma->vm_flags = VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT;
		vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
		down_write(&current->mm->mmap_sem);
		if (insert_vm_struct(current->mm, vma)) {
			up_write(&current->mm->mmap_sem);
			kmem_cache_free(vm_area_cachep, vma);
			return;
		}
		up_write(&current->mm->mmap_sem);
	}

	/* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
	if (!(current->personality & MMAP_PAGE_ZERO)) {
		vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL);
		if (vma) {
			INIT_LIST_HEAD(&vma->anon_vma_chain);
			vma->vm_mm = current->mm;
			vma->vm_end = PAGE_SIZE;
			vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
			vma->vm_flags = VM_READ | VM_MAYREAD | VM_IO |
					VM_DONTEXPAND | VM_DONTDUMP;
			down_write(&current->mm->mmap_sem);
			if (insert_vm_struct(current->mm, vma)) {
				up_write(&current->mm->mmap_sem);
				kmem_cache_free(vm_area_cachep, vma);
				return;
			}
			up_write(&current->mm->mmap_sem);
		}
	}
}

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84
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77
28.41%
2
16.67%
Linus Torvalds (pre-git)
64
23.62%
1
8.33%
Rik Van Riel
16
5.90%
1
8.33%
Coly Li
11
4.06%
1
8.33%
Martin Hicks
10
3.69%
2
16.67%
Konstantin Khlebnikov
3
1.11%
1
8.33%
Robert P. J. Day
2
0.74%
1
8.33%
Hugh Dickins
2
0.74%
1
8.33%
Christoph Lameter
2
0.74%
1
8.33%
Total
271
100.00%
12
100.00%


void

free_initmem (void)
{
	free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
			   -1, "unused kernel");
}

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Linus Torvalds (pre-git)
12
48.00%
1
25.00%
Jiang Liu
7
28.00%
2
50.00%
Tony Luck
6
24.00%
1
25.00%
Total
25
100.00%
4
100.00%


void __init

free_initrd_mem (unsigned long start, unsigned long end)
{
	/*
         * EFI uses 4KB pages while the kernel can use 4KB or bigger.
         * Thus EFI and the kernel may have different page sizes. It is
         * therefore possible to have the initrd share the same page as
         * the end of the kernel (given current setup).
         *
         * To avoid freeing/using the wrong page (kernel sized) we:
         *      - align up the beginning of initrd
         *      - align down the end of initrd
         *
         *  |             |
         *  |=============| a000
         *  |             |
         *  |             |
         *  |             | 9000
         *  |/////////////|
         *  |/////////////|
         *  |=============| 8000
         *  |///INITRD////|
         *  |/////////////|
         *  |/////////////| 7000
         *  |             |
         *  |KKKKKKKKKKKKK|
         *  |=============| 6000
         *  |KKKKKKKKKKKKK|
         *  |KKKKKKKKKKKKK|
         *  K=kernel using 8KB pages
         *
         * In this example, we must free page 8000 ONLY. So we must align up
         * initrd_start and keep initrd_end as is.
         */
	start = PAGE_ALIGN(start);
	end = end & PAGE_MASK;

	if (start < end)
		printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);

	for (; start < end; start += PAGE_SIZE) {
		if (!virt_addr_valid(start))
			continue;
		free_reserved_page(virt_to_page(start));
	}
}

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Linus Torvalds (pre-git)
54
69.23%
3
33.33%
Linus Torvalds
14
17.95%
1
11.11%
Roman Zippel
5
6.41%
1
11.11%
Jiang Liu
2
2.56%
1
11.11%
Peter Chubb
1
1.28%
1
11.11%
Josh Aas
1
1.28%
1
11.11%
Kenneth W. Chen
1
1.28%
1
11.11%
Total
78
100.00%
9
100.00%

/*
 * This installs a clean page in the kernel's page table.
 */

static struct page * __init

put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = pgd_offset_k(address);		/* note: this is NOT pgd_offset()! */

	{
		pud = pud_alloc(&init_mm, pgd, address);
		if (!pud)
			goto out;
		pmd = pmd_alloc(&init_mm, pud, address);
		if (!pmd)
			goto out;
		pte = pte_alloc_kernel(pmd, address);
		if (!pte)
			goto out;
		if (!pte_none(*pte))
			goto out;
		set_pte(pte, mk_pte(page, pgprot));
	}
  out:
	/* no need for flush_tlb */
	return page;
}

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Linus Torvalds (pre-git)
85
63.43%
2
28.57%
Nicholas Piggin
25
18.66%
1
14.29%
Linus Torvalds
16
11.94%
1
14.29%
David Mosberger-Tang
5
3.73%
1
14.29%
Kenneth W. Chen
2
1.49%
1
14.29%
Hugh Dickins
1
0.75%
1
14.29%
Total
134
100.00%
7
100.00%


static void __init

setup_gate (void)
{
	struct page *page;

	/*
         * Map the gate page twice: once read-only to export the ELF
         * headers etc. and once execute-only page to enable
         * privilege-promotion via "epc":
         */
	page = virt_to_page(ia64_imva(__start_gate_section));
	put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
#ifdef HAVE_BUGGY_SEGREL
	page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
	put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
#else
	put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
	/* Fill in the holes (if any) with read-only zero pages: */
	{
		unsigned long addr;

		for (addr = GATE_ADDR + PAGE_SIZE;
		     addr < GATE_ADDR + PERCPU_PAGE_SIZE;
		     addr += PAGE_SIZE)
		{
			put_kernel_page(ZERO_PAGE(0), addr,
					PAGE_READONLY);
			put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
					PAGE_READONLY);
		}
	}
#endif
	ia64_patch_gate();
}

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David Mosberger-Tang
128
97.71%
4
66.67%
Luis R. Rodriguez
2
1.53%
1
16.67%
Kenneth W. Chen
1
0.76%
1
16.67%
Total
131
100.00%
6
100.00%


static struct vm_area_struct gate_vma;



static int __init gate_vma_init(void)
{
	gate_vma.vm_mm = NULL;
	gate_vma.vm_start = FIXADDR_USER_START;
	gate_vma.vm_end = FIXADDR_USER_END;
	gate_vma.vm_flags = VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC;
	gate_vma.vm_page_prot = __P101;

	return 0;
}
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Andrew Lutomirski
48
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48
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1
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__initcall(gate_vma_init);



struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
	return &gate_vma;
}

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16
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int in_gate_area_no_mm(unsigned long addr)
{
	if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
		return 1;
	return 0;
}

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Andrew Lutomirski
29
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29
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1
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int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
	return in_gate_area_no_mm(addr);
}

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20
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20
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void ia64_mmu_init(void *my_cpu_data)
{
	unsigned long pta, impl_va_bits;
	extern void tlb_init(void);

#ifdef CONFIG_DISABLE_VHPT

#	define VHPT_ENABLE_BIT	0
#else
#	define VHPT_ENABLE_BIT	1
#endif

	/*
         * Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
         * address space.  The IA-64 architecture guarantees that at least 50 bits of
         * virtual address space are implemented but if we pick a large enough page size
         * (e.g., 64KB), the mapped address space is big enough that it will overlap with
         * VMLPT.  I assume that once we run on machines big enough to warrant 64KB pages,
         * IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
         * problem in practice.  Alternatively, we could truncate the top of the mapped
         * address space to not permit mappings that would overlap with the VMLPT.
         * --davidm 00/12/06
         */

#	define pte_bits			3

#	define mapped_space_bits	(3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
	/*
         * The virtual page table has to cover the entire implemented address space within
         * a region even though not all of this space may be mappable.  The reason for
         * this is that the Access bit and Dirty bit fault handlers perform
         * non-speculative accesses to the virtual page table, so the address range of the
         * virtual page table itself needs to be covered by virtual page table.
         */

#	define vmlpt_bits		(impl_va_bits - PAGE_SHIFT + pte_bits)

#	define POW2(n)			(1ULL << (n))

	impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));

	if (impl_va_bits < 51 || impl_va_bits > 61)
		panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
	/*
         * mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
         * which must fit into "vmlpt_bits - pte_bits" slots. Second half of
         * the test makes sure that our mapped space doesn't overlap the
         * unimplemented hole in the middle of the region.
         */
	if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
	    (mapped_space_bits > impl_va_bits - 1))
		panic("Cannot build a big enough virtual-linear page table"
		      " to cover mapped address space.\n"
		      " Try using a smaller page size.\n");


	/* place the VMLPT at the end of each page-table mapped region: */
	pta = POW2(61) - POW2(vmlpt_bits);

	/*
         * Set the (virtually mapped linear) page table address.  Bit
         * 8 selects between the short and long format, bits 2-7 the
         * size of the table, and bit 0 whether the VHPT walker is
         * enabled.
         */
	ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);

	ia64_tlb_init();

#ifdef	CONFIG_HUGETLB_PAGE
	ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
	ia64_srlz_d();
#endif
}

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105
59.66%
4
36.36%
Peter Chubb
28
15.91%
1
9.09%
Linus Torvalds
23
13.07%
2
18.18%
Kenneth W. Chen
12
6.82%
1
9.09%
Tony Luck
4
2.27%
1
9.09%
David Mosberger-Tang
3
1.70%
1
9.09%
Greg Kroah-Hartman
1
0.57%
1
9.09%
Total
176
100.00%
11
100.00%

#ifdef CONFIG_VIRTUAL_MEM_MAP


int vmemmap_find_next_valid_pfn(int node, int i)
{
	unsigned long end_address, hole_next_pfn;
	unsigned long stop_address;
	pg_data_t *pgdat = NODE_DATA(node);

	end_address = (unsigned long) &vmem_map[pgdat->node_start_pfn + i];
	end_address = PAGE_ALIGN(end_address);
	stop_address = (unsigned long) &vmem_map[pgdat_end_pfn(pgdat)];

	do {
		pgd_t *pgd;
		pud_t *pud;
		pmd_t *pmd;
		pte_t *pte;

		pgd = pgd_offset_k(end_address);
		if (pgd_none(*pgd)) {
			end_address += PGDIR_SIZE;
			continue;
		}

		pud = pud_offset(pgd, end_address);
		if (pud_none(*pud)) {
			end_address += PUD_SIZE;
			continue;
		}

		pmd = pmd_offset(pud, end_address);
		if (pmd_none(*pmd)) {
			end_address += PMD_SIZE;
			continue;
		}

		pte = pte_offset_kernel(pmd, end_address);
retry_pte:
		if (pte_none(*pte)) {
			end_address += PAGE_SIZE;
			pte++;
			if ((end_address < stop_address) &&
			    (end_address != ALIGN(end_address, 1UL << PMD_SHIFT)))
				goto retry_pte;
			continue;
		}
		/* Found next valid vmem_map page */
		break;
	} while (end_address < stop_address);

	end_address = min(end_address, stop_address);
	end_address = end_address - (unsigned long) vmem_map + sizeof(struct page) - 1;
	hole_next_pfn = end_address / sizeof(struct page);
	return hole_next_pfn - pgdat->node_start_pfn;
}

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3
1.14%
1
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263
100.00%
2
100.00%



int __init create_mem_map_page_table(u64 start, u64 end, void *arg)
{
	unsigned long address, start_page, end_page;
	struct page *map_start, *map_end;
	int node;
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
	map_end   = vmem_map + (__pa(end) >> PAGE_SHIFT);

	start_page = (unsigned long) map_start & PAGE_MASK;
	end_page = PAGE_ALIGN((unsigned long) map_end);
	node = paddr_to_nid(__pa(start));

	for (address = start_page; address < end_page; address += PAGE_SIZE) {
		pgd = pgd_offset_k(address);
		if (pgd_none(*pgd))
			pgd_populate(&init_mm, pgd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
		pud = pud_offset(pgd, address);

		if (pud_none(*pud))
			pud_populate(&init_mm, pud, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
		pmd = pmd_offset(pud, address);

		if (pmd_none(*pmd))
			pmd_populate_kernel(&init_mm, pmd, alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE));
		pte = pte_offset_kernel(pmd, address);

		if (pte_none(*pte))
			set_pte(pte, pfn_pte(__pa(alloc_bootmem_pages_node(NODE_DATA(node), PAGE_SIZE)) >> PAGE_SHIFT,
					     PAGE_KERNEL));
	}
	return 0;
}

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David Mosberger-Tang
168
61.76%
1
16.67%
Nicholas Piggin
40
14.71%
1
16.67%
Jesse Barnes
31
11.40%
1
16.67%
Linus Torvalds (pre-git)
27
9.93%
1
16.67%
Kimio Suganuma
5
1.84%
1
16.67%
Kenneth W. Chen
1
0.37%
1
16.67%
Total
272
100.00%
6
100.00%


struct memmap_init_callback_data {
	
struct page *start;
	
struct page *end;
	
int nid;
	
unsigned long zone;
};


static int __meminit

virtual_memmap_init(u64 start, u64 end, void *arg)
{
	struct memmap_init_callback_data *args;
	struct page *map_start, *map_end;

	args = (struct memmap_init_callback_data *) arg;
	map_start = vmem_map + (__pa(start) >> PAGE_SHIFT);
	map_end   = vmem_map + (__pa(end) >> PAGE_SHIFT);

	if (map_start < args->start)
		map_start = args->start;
	if (map_end > args->end)
		map_end = args->end;

	/*
         * We have to initialize "out of bounds" struct page elements that fit completely
         * on the same pages that were allocated for the "in bounds" elements because they
         * may be referenced later (and found to be "reserved").
         */
	map_start -= ((unsigned long) map_start & (PAGE_SIZE - 1)) / sizeof(struct page);
	map_end += ((PAGE_ALIGN((unsigned long) map_end) - (unsigned long) map_end)
		    / sizeof(struct page));

	if (map_start < map_end)
		memmap_init_zone((unsigned long)(map_end - map_start),
				 args->nid, args->zone, page_to_pfn(map_start),
				 MEMMAP_EARLY);
	return 0;
}

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David Mosberger-Tang
177
98.33%
1
33.33%
Dave Hansen
2
1.11%
1
33.33%
Adrian Bunk
1
0.56%
1
33.33%
Total
180
100.00%
3
100.00%


void __meminit

memmap_init (unsigned long size, int nid, unsigned long zone,
	     unsigned long start_pfn)
{
	if (!vmem_map)
		memmap_init_zone(size, nid, zone, start_pfn, MEMMAP_EARLY);
	else {
		struct page *start;
		struct memmap_init_callback_data args;

		start = pfn_to_page(start_pfn);
		args.start = start;
		args.end = start + size;
		args.nid = nid;
		args.zone = zone;

		efi_memmap_walk(virtual_memmap_init, &args);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Mosberger-Tang
77
83.70%
1
25.00%
Dave Hansen
14
15.22%
2
50.00%
Adrian Bunk
1
1.09%
1
25.00%
Total
92
100.00%
4
100.00%


int

ia64_pfn_valid (unsigned long pfn)
{
	char byte;
	struct page *pg = pfn_to_page(pfn);

	return     (__get_user(byte, (char __user *) pg) == 0)
		&& ((((u64)pg & PAGE_MASK) == (((u64)(pg + 1) - 1) & PAGE_MASK))
			|| (__get_user(byte, (char __user *) (pg + 1) - 1) == 0));
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
John S. Marvin
62
68.13%
1
33.33%
David Mosberger-Tang
29
31.87%
2
66.67%
Total
91
100.00%
3
100.00%


EXPORT_SYMBOL(ia64_pfn_valid);



int __init find_largest_hole(u64 start, u64 end, void *arg)
{
	u64 *max_gap = arg;

	static u64 last_end = PAGE_OFFSET;

	/* NOTE: this algorithm assumes efi memmap table is ordered */

	if (*max_gap < (start - last_end))
		*max_gap = start - last_end;
	last_end = end;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Mosberger-Tang
53
98.15%
1
50.00%
Kenneth W. Chen
1
1.85%
1
50.00%
Total
54
100.00%
2
100.00%

#endif /* CONFIG_VIRTUAL_MEM_MAP */



int __init register_active_ranges(u64 start, u64 len, int nid)
{
	u64 end = start + len;

#ifdef CONFIG_KEXEC
	if (start > crashk_res.start && start < crashk_res.end)
		start = crashk_res.end;
	if (end > crashk_res.start && end < crashk_res.end)
		end = crashk_res.start;
#endif

	if (start < end)
		memblock_add_node(__pa(start), end - start, nid);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Bob Picco
57
63.33%
1
25.00%
Mel Gorman
21
23.33%
1
25.00%
Menyhart Zoltan
7
7.78%
1
25.00%
Tejun Heo
5
5.56%
1
25.00%
Total
90
100.00%
4
100.00%


int

find_max_min_low_pfn (u64 start, u64 end, void *arg)
{
	unsigned long pfn_start, pfn_end;
#ifdef CONFIG_FLATMEM
	pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT;
	pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT;
#else
	pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT;
	pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT;
#endif
	min_low_pfn = min(min_low_pfn, pfn_start);
	max_low_pfn = max(max_low_pfn, pfn_end);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Zou Nan hai
103
98.10%
1
50.00%
Matthew Wilcox
2
1.90%
1
50.00%
Total
105
100.00%
2
100.00%

/*
 * Boot command-line option "nolwsys" can be used to disable the use of any light-weight
 * system call handler.  When this option is in effect, all fsyscalls will end up bubbling
 * down into the kernel and calling the normal (heavy-weight) syscall handler.  This is
 * useful for performance testing, but conceivably could also come in handy for debugging
 * purposes.
 */


static int nolwsys __initdata;


static int __init

nolwsys_setup (char *s)
{
	nolwsys = 1;
	return 1;
}

Contributors
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CommitProp
David Mosberger-Tang
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%

__setup("nolwsys", nolwsys_setup);


void __init

mem_init (void)
{
	int i;

	BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
	BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
	BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE);

#ifdef CONFIG_PCI
	/*
         * This needs to be called _after_ the command line has been parsed but _before_
         * any drivers that may need the PCI DMA interface are initialized or bootmem has
         * been freed.
         */
	platform_dma_init();
#endif

#ifdef CONFIG_FLATMEM
	BUG_ON(!mem_map);
#endif

	set_max_mapnr(max_low_pfn);
	high_memory = __va(max_low_pfn * PAGE_SIZE);
	free_all_bootmem();
	mem_init_print_info(NULL);

	/*
         * For fsyscall entrpoints with no light-weight handler, use the ordinary
         * (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
         * code can tell them apart.
         */
	for (i = 0; i < NR_syscalls; ++i) {
		extern unsigned long fsyscall_table[NR_syscalls];
		extern unsigned long sys_call_table[NR_syscalls];

		if (!fsyscall_table[i] || nolwsys)
			fsyscall_table[i] = sys_call_table[i] | 1;
	}
	setup_gate();
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Mosberger-Tang
54
36.99%
3
23.08%
Robin Holt
36
24.66%
1
7.69%
Linus Torvalds (pre-git)
32
21.92%
2
15.38%
Jiang Liu
9
6.16%
2
15.38%
Luis R. Rodriguez
6
4.11%
1
7.69%
Stoyan Gaydarov
3
2.05%
1
7.69%
Bob Picco
3
2.05%
1
7.69%
Kimio Suganuma
2
1.37%
1
7.69%
Kenneth W. Chen
1
0.68%
1
7.69%
Total
146
100.00%
13
100.00%

#ifdef CONFIG_MEMORY_HOTPLUG


int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
{
	pg_data_t *pgdat;
	struct zone *zone;
	unsigned long start_pfn = start >> PAGE_SHIFT;
	unsigned long nr_pages = size >> PAGE_SHIFT;
	int ret;

	pgdat = NODE_DATA(nid);

	zone = pgdat->node_zones +
		zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
	ret = __add_pages(nid, zone, start_pfn, nr_pages);

	if (ret)
		printk("%s: Problem encountered in __add_pages() as ret=%d\n",
		       __func__,  ret);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Yasunori Goto
83
83.00%
2
33.33%
Wang Nan
9
9.00%
1
16.67%
Dan J Williams
5
5.00%
1
16.67%
Gary Hade
2
2.00%
1
16.67%
Harvey Harrison
1
1.00%
1
16.67%
Total
100
100.00%
6
100.00%

#ifdef CONFIG_MEMORY_HOTREMOVE


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

	zone = page_zone(pfn_to_page(start_pfn));
	ret = __remove_pages(zone, start_pfn, nr_pages);
	if (ret)
		pr_warn("%s: Problem encountered in __remove_pages() as"
			" ret=%d\n", __func__,  ret);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Wen Congyang
73
100.00%
1
100.00%
Total
73
100.00%
1
100.00%

#endif
#endif
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Mosberger-Tang
948
33.65%
17
18.68%
Linus Torvalds (pre-git)
425
15.09%
5
5.49%
Bob Picco
326
11.57%
3
3.30%
Zou Nan hai
187
6.64%
2
2.20%
Andrew Lutomirski
123
4.37%
1
1.10%
Yasunori Goto
86
3.05%
2
2.20%
Wen Congyang
78
2.77%
1
1.10%
Jan Beulich
74
2.63%
1
1.10%
Nicholas Piggin
65
2.31%
1
1.10%
Linus Torvalds
63
2.24%
4
4.40%
John S. Marvin
62
2.20%
1
1.10%
Martin Hicks
46
1.63%
2
2.20%
Robin Holt
36
1.28%
1
1.10%
Jesse Barnes
34
1.21%
1
1.10%
Peter Chubb
29
1.03%
2
2.20%
Mel Gorman
21
0.75%
1
1.10%
Kenneth W. Chen
20
0.71%
4
4.40%
Tony Luck
19
0.67%
2
2.20%
Jiang Liu
18
0.64%
4
4.40%
Dave Hansen
16
0.57%
2
2.20%
Rik Van Riel
16
0.57%
1
1.10%
Coly Li
11
0.39%
1
1.10%
Kamezawa Hiroyuki
11
0.39%
3
3.30%
Tejun Heo
10
0.35%
2
2.20%
Wang Nan
9
0.32%
1
1.10%
Kimio Suganuma
9
0.32%
1
1.10%
Yanmin Zhang
8
0.28%
1
1.10%
Luis R. Rodriguez
8
0.28%
1
1.10%
Christoph Lameter
7
0.25%
2
2.20%
Menyhart Zoltan
7
0.25%
1
1.10%
Dan J Williams
5
0.18%
1
1.10%
Roman Zippel
5
0.18%
1
1.10%
Andrew Morton
4
0.14%
2
2.20%
Xishi Qiu
3
0.11%
1
1.10%
Ingo Molnar
3
0.11%
1
1.10%
Hugh Dickins
3
0.11%
2
2.20%
Stoyan Gaydarov
3
0.11%
1
1.10%
Adrian Bunk
3
0.11%
2
2.20%
Konstantin Khlebnikov
3
0.11%
1
1.10%
Jiri Slaby
3
0.11%
1
1.10%
Matthew Wilcox
2
0.07%
1
1.10%
Robert P. J. Day
2
0.07%
1
1.10%
Gary Hade
2
0.07%
1
1.10%
Greg Kroah-Hartman
1
0.04%
1
1.10%
Josh Aas
1
0.04%
1
1.10%
Harvey Harrison
1
0.04%
1
1.10%
Matt Domsch
1
0.04%
1
1.10%
Total
2817
100.00%
91
100.00%
Directory: arch/ia64/mm

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