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pagemap: pass mm into pagewalkers

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We need this at least for huge page detection for now, because powerpc
needs the vm_area_struct to be able to determine whether a virtual address
is referring to a huge page (its pmd_huge() doesn't work).

It might also come in handy for some of the other users.

Signed-off-by: Dave Hansen <[email protected]>
Acked-by: Matt Mackall <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Dave Hansen 2008-06-12 15:21:47 -07:00 • committed by Linus Torvalds
commit 2165009bdf
3 changed files with 56 additions and 47 deletions
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44
fs/proc/task_mmu.c
View file

@ -315,9 +315,9 @@ struct mem_size_stats {
};
static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
void *private)
struct mm_walk *walk)
{
struct mem_size_stats *mss = private;
struct mem_size_stats *mss = walk->private;
struct vm_area_struct *vma = mss->vma;
pte_t *pte, ptent;
spinlock_t *ptl;
@ -365,19 +365,21 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
return 0;
}
static struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range };
static int show_smap(struct seq_file *m, void *v)
{
struct vm_area_struct *vma = v;
struct mem_size_stats mss;
int ret;
struct mm_walk smaps_walk = {
.pmd_entry = smaps_pte_range,
.mm = vma->vm_mm,
.private = &mss,
};
memset(&mss, 0, sizeof mss);
mss.vma = vma;
if (vma->vm_mm && !is_vm_hugetlb_page(vma))
walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
&smaps_walk, &mss);
walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk);
ret = show_map(m, v);
if (ret)
@ -426,9 +428,9 @@ const struct file_operations proc_smaps_operations = {
};
static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
unsigned long end, void *private)
unsigned long end, struct mm_walk *walk)
{
struct vm_area_struct *vma = private;
struct vm_area_struct *vma = walk->private;
pte_t *pte, ptent;
spinlock_t *ptl;
struct page *page;
@ -452,8 +454,6 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr,
return 0;
}
static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range };
static ssize_t clear_refs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
@ -476,11 +476,17 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf,
return -ESRCH;
mm = get_task_mm(task);
if (mm) {
static struct mm_walk clear_refs_walk;
memset(&clear_refs_walk, 0, sizeof(clear_refs_walk));
clear_refs_walk.pmd_entry = clear_refs_pte_range;
clear_refs_walk.mm = mm;
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next)
for (vma = mm->mmap; vma; vma = vma->vm_next) {
clear_refs_walk.private = vma;
if (!is_vm_hugetlb_page(vma))
walk_page_range(mm, vma->vm_start, vma->vm_end,
&clear_refs_walk, vma);
walk_page_range(vma->vm_start, vma->vm_end,
&clear_refs_walk);
}
flush_tlb_mm(mm);
up_read(&mm->mmap_sem);
mmput(mm);
@ -528,9 +534,9 @@ static int add_to_pagemap(unsigned long addr, u64 pfn,
}
static int pagemap_pte_hole(unsigned long start, unsigned long end,
void *private)
struct mm_walk *walk)
{
struct pagemapread *pm = private;
struct pagemapread *pm = walk->private;
unsigned long addr;
int err = 0;
for (addr = start; addr < end; addr += PAGE_SIZE) {
@ -548,9 +554,9 @@ static u64 swap_pte_to_pagemap_entry(pte_t pte)
}
static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
void *private)
struct mm_walk *walk)
{
struct pagemapread *pm = private;
struct pagemapread *pm = walk->private;
pte_t *pte;
int err = 0;
@ -675,8 +681,8 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
* user buffer is tracked in "pm", and the walk
* will stop when we hit the end of the buffer.
*/
ret = walk_page_range(mm, start_vaddr, end_vaddr,
&pagemap_walk, &pm);
ret = walk_page_range(start_vaddr, end_vaddr,
&pagemap_walk);
if (ret == PM_END_OF_BUFFER)
ret = 0;
/* don't need mmap_sem for these, but this looks cleaner */