mm: numa: clear numa hinting information on mprotect

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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index dbafffa..70e7429 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1532,6 +1532,8 @@ 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 1291a05..f842172 100644 (file)
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -54,6 +54,8 @@ 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 {