The patch titled
Subject: mm/gup: check for protnone only if it is a PTE entry
has been added to the -mm tree. Its filename is
mm-gup-check-for-protnone-only-if-it-is-a-pte-entry.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-gup-check-for-protnone-only-if-it-is-a-pte-entry.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-gup-check-for-protnone-only-if-it-is-a-pte-entry.patch
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------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Subject: mm/gup: check for protnone only if it is a PTE entry
Do the prot_none/FOLL_NUMA check after we are sure this is a THP pte.
Archs can implement prot_none such that it can return true for regular pmd
entries.
Link: http://lkml.kernel.org/r/1487498326-8734-1-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>
Cc: Hillf Danton <hillf.zj@xxxxxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/gup.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff -puN mm/gup.c~mm-gup-check-for-protnone-only-if-it-is-a-pte-entry mm/gup.c
--- a/mm/gup.c~mm-gup-check-for-protnone-only-if-it-is-a-pte-entry
+++ a/mm/gup.c
@@ -272,8 +272,6 @@ struct page *follow_page_mask(struct vm_
return page;
return no_page_table(vma, flags);
}
- if ((flags & FOLL_NUMA) && pmd_protnone(*pmd))
- return no_page_table(vma, flags);
if (pmd_devmap(*pmd)) {
ptl = pmd_lock(mm, pmd);
page = follow_devmap_pmd(vma, address, pmd, flags);
@@ -284,6 +282,9 @@ struct page *follow_page_mask(struct vm_
if (likely(!pmd_trans_huge(*pmd)))
return follow_page_pte(vma, address, pmd, flags);
+ if ((flags & FOLL_NUMA) && pmd_protnone(*pmd))
+ return no_page_table(vma, flags);
+
ptl = pmd_lock(mm, pmd);
if (unlikely(!pmd_trans_huge(*pmd))) {
spin_unlock(ptl);
_
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-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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