From: Mel Gorman <[email protected]> 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 <[email protected]> Reviewed-by: Rik van Riel <[email protected]> Cc: Alex Thorlton <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- 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 { _ -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
