From: Mel Gorman <mgorman@xxxxxxx>
Subject: 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@xxxxxxx>
Reviewed-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: Alex Thorlton <athorlton@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 2 ++
mm/mprotect.c | 2 ++
2 files changed, 4 insertions(+)
diff -puN mm/huge_memory.c~mm-numa-clear-numa-hinting-information-on-mprotect mm/huge_memory.c
--- a/mm/huge_memory.c~mm-numa-clear-numa-hinting-information-on-mprotect
+++ a/mm/huge_memory.c
@@ -1532,6 +1532,8 @@ int change_huge_pmd(struct vm_area_struc
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 -puN mm/mprotect.c~mm-numa-clear-numa-hinting-information-on-mprotect mm/mprotect.c
--- a/mm/mprotect.c~mm-numa-clear-numa-hinting-information-on-mprotect
+++ a/mm/mprotect.c
@@ -54,6 +54,8 @@ static unsigned long change_pte_range(st
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 {
_
--
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