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    Subject[PATCH 3.12 058/144] sched: numa: skip inaccessible VMAs
    Date
    3.12-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Mel Gorman <mgorman@suse.de>

    commit 3c67f474558748b604e247d92b55dfe89654c81d upstream.

    Inaccessible VMA should not be trapping NUMA hint faults. Skip them.

    Signed-off-by: Mel Gorman <mgorman@suse.de>
    Reviewed-by: Rik van Riel <riel@redhat.com>
    Cc: Alex Thorlton <athorlton@sgi.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    kernel/sched/fair.c | 7 +++++++
    1 file changed, 7 insertions(+)

    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -974,6 +974,13 @@ void task_numa_work(struct callback_head
    if (vma->vm_end - vma->vm_start < HPAGE_SIZE)
    continue;

    + /*
    + * Skip inaccessible VMAs to avoid any confusion between
    + * PROT_NONE and NUMA hinting ptes
    + */
    + if (!(vma->vm_flags & (VM_READ | VM_EXEC | VM_WRITE)))
    + continue;
    +
    do {
    start = max(start, vma->vm_start);
    end = ALIGN(start + (pages << PAGE_SHIFT), HPAGE_SIZE);



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