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    Subject[PATCH 3.8 091/166] mm: numa: clear numa hinting information on mprotect
    Date
    3.8.13.16 -stable review patch.  If anyone has any objections, please let me know.

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

    From: Mel Gorman <mgorman@suse.de>

    commit 1667918b6483b12a6496bf54151b827b8235d7b1 upstream.

    On a protection change it is no longer clear if the page should be still
    accessible. This patch clears the NUMA hinting fault bits on a
    protection change.

    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: Kamal Mostafa <kamal@canonical.com>
    ---
    mm/huge_memory.c | 2 ++
    mm/mprotect.c | 2 ++
    2 files changed, 4 insertions(+)

    diff --git a/mm/huge_memory.c b/mm/huge_memory.c
    index 594b3c1..a67726d 100644
    --- a/mm/huge_memory.c
    +++ b/mm/huge_memory.c
    @@ -1504,6 +1504,8 @@ int change_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd,
    ret = 1;
    if (!prot_numa) {
    entry = pmdp_get_and_clear(mm, addr, pmd);
    + if (pmd_numa(entry))
    + entry = pmd_mknonnuma(entry);
    entry = pmd_modify(entry, newprot);
    ret = HPAGE_PMD_NR;
    BUG_ON(pmd_write(entry));
    diff --git a/mm/mprotect.c b/mm/mprotect.c
    index 79abf13..c477655 100644
    --- a/mm/mprotect.c
    +++ b/mm/mprotect.c
    @@ -56,6 +56,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,

    if (!prot_numa) {
    ptent = ptep_modify_prot_start(mm, addr, pte);
    + if (pte_numa(ptent))
    + ptent = pte_mknonnuma(ptent);
    ptent = pte_modify(ptent, newprot);
    updated = true;
    } else {
    --
    1.8.3.2


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