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thp: fix MADV_DONTNEED vs clear soft dirty race

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Yet another instance of the same race.

Fix is identical to change_huge_pmd().

See "thp: fix MADV_DONTNEED vs.  numa balancing race" for more details.

Link: http://lkml.kernel.org/r/20170302151034.27829-5-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2017-04-13 14:56:28 -07:00 committed by Linus Torvalds
parent 58ceeb6bec
commit 5b7abeae3a
1 changed files with 8 additions and 1 deletions
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9
fs/proc/task_mmu.c
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@ -900,7 +900,14 @@ static inline void clear_soft_dirty(struct vm_area_struct *vma,
static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmdp)
{
pmd_t pmd = pmdp_huge_get_and_clear(vma->vm_mm, addr, pmdp);
pmd_t pmd = *pmdp;
/* See comment in change_huge_pmd() */
pmdp_invalidate(vma, addr, pmdp);
if (pmd_dirty(*pmdp))
pmd = pmd_mkdirty(pmd);
if (pmd_young(*pmdp))
pmd = pmd_mkyoung(pmd);
pmd = pmd_wrprotect(pmd);
pmd = pmd_clear_soft_dirty(pmd);