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Fix clear_refs_write() use of struct mm_walk

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Don't use a static entry, so as to prevent races during concurrent use
of this function.

Reported-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andrew Morton 2008-07-05 12:29:05 -07:00 committed by Linus Torvalds
parent fbe0825752
commit 20cbc97261
1 changed files with 4 additions and 4 deletions
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8
fs/proc/task_mmu.c
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@ -476,10 +476,10 @@ 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;
struct mm_walk clear_refs_walk = {
.pmd_entry = clear_refs_pte_range,
.mm = mm,
};
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
clear_refs_walk.private = vma;