From 2c0346a36cc8ac6cb85ab585964590974c84bdf0 Mon Sep 17 00:00:00 2001
From: Mel Gorman <mgorman@suse.de>
Date: Thu, 9 Oct 2014 15:29:36 -0700
Subject: [PATCH] mm: mempolicy: skip inaccessible VMAs when setting
MPOL_MF_LAZY
PROT_NUMA VMAs are skipped to avoid problems distinguishing between
present, prot_none and special entries. MPOL_MF_LAZY is not visible from
userspace since commit a720094ded8c ("mm: mempolicy: Hide MPOL_NOOP and
MPOL_MF_LAZY from userspace for now") but it should still skip VMAs the
same way task_numa_work does.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/mempolicy.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 008fb32936ebf..e58725aff7e99 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -681,7 +681,9 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
}
if (flags & MPOL_MF_LAZY) {
- change_prot_numa(vma, start, endvma);
+ /* Similar to task_numa_work, skip inaccessible VMAs */
+ if (vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE))
+ change_prot_numa(vma, start, endvma);
goto next;
}
--
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