The patch titled
Subject: mm/autonuma: don't mark pte saved write in case of dirty_accountable
has been added to the -mm tree. Its filename is
mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3-fix.patch
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From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Subject: mm/autonuma: don't mark pte saved write in case of dirty_accountable
We never request for protection update with ditry_accountable set and
prot_numa set. Hence mark the pte with mkwrite instead mk_savedwrite.
Found this when running stress-ng test with debug check enabled. This
trigger the VM_BUG_ON in pte_mk_savedwrite()
Fixes: http://ozlabs.org/~akpm/mmots/broken-out/mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte.patch
Link: http://lkml.kernel.org/r/1487942884-16517-1-git-send-email-aneesh.kumar@xxxxxxxxxxxxxxxxxx
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mprotect.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/mprotect.c~mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3-fix mm/mprotect.c
--- a/mm/mprotect.c~mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3-fix
+++ a/mm/mprotect.c
@@ -105,7 +105,7 @@ static unsigned long change_pte_range(st
if (dirty_accountable && pte_dirty(ptent) &&
(pte_soft_dirty(ptent) ||
!(vma->vm_flags & VM_SOFTDIRTY))) {
- ptent = pte_mk_savedwrite(ptent);
+ ptent = pte_mkwrite(ptent);
}
ptep_modify_prot_commit(mm, addr, pte, ptent);
pages++;
_
Patches currently in -mm which might be from aneesh.kumar@xxxxxxxxxxxxxxxxxx are
mm-autonuma-dont-use-set_pte_at-when-updating-protnone-ptes.patch
mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte.patch
mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3.patch
mm-autonuma-let-architecture-override-how-the-write-bit-should-be-stashed-in-a-protnone-pte-v3-fix.patch
mm-ksm-handle-protnone-saved-writes-when-making-page-write-protect.patch
powerpc-mm-autonuma-switch-ppc64-to-its-own-implementeation-of-saved-write.patch
powerpc-mm-autonuma-switch-ppc64-to-its-own-implementeation-of-saved-write-v3.patch
mm-gup-check-for-protnone-only-if-it-is-a-pte-entry.patch
mm-thp-autonuma-use-tnf-flag-instead-of-vm-fault.patch
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