Use arch-specified ptep_test_and_clear_young() to clear the pte accessed
bits for /proc/pid/clear_refs. This avoids a race condition if a pte is
modified between pte_mkold() and set_pte_at().
Cc: Hugh Dickins <[EMAIL PROTECTED]>
Signed-off-by: David Rientjes <[EMAIL PROTECTED]>
---
fs/proc/task_mmu.c | 5 +----
1 files changed, 1 insertions(+), 4 deletions(-)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -277,10 +277,7 @@ static void clear_refs_one_pmd(struct vm_area_struct *vma,
pmd_t *pmd,
continue;
/* Clear accessed and referenced bits. */
- if (pte_young(ptent)) {
- ptent = pte_mkold(ptent);
- set_pte_at(vma->vm_mm, addr, pte, ptent);
- }
+ ptep_test_and_clear_young(vma, addr, pte);
ClearPageReferenced(page);
}
pte_unmap_unlock(pte - 1, ptl);
-
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