The patch titled
Subject: thp: fix MADV_DONTNEED vs. MADV_FREE race
has been added to the -mm tree. Its filename is
thp-fix-madv_dontneed-vs-madv_free-race.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/thp-fix-madv_dontneed-vs-madv_free-race.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/thp-fix-madv_dontneed-vs-madv_free-race.patch
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: thp: fix MADV_DONTNEED vs. MADV_FREE race
Basically the same race as with numa balancing in change_huge_pmd(), but
a bit simpler to mitigate: we don't need to preserve dirty/young flags
here due to MADV_FREE functionality.
See "thp: fix MADV_DONTNEED vs. numa balancing race" for more details.
Link: http://lkml.kernel.org/r/20170302151034.27829-4-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/huge_memory.c | 2 --
1 file changed, 2 deletions(-)
diff -puN mm/huge_memory.c~thp-fix-madv_dontneed-vs-madv_free-race mm/huge_memory.c
--- a/mm/huge_memory.c~thp-fix-madv_dontneed-vs-madv_free-race
+++ a/mm/huge_memory.c
@@ -1565,8 +1565,6 @@ bool madvise_free_huge_pmd(struct mmu_ga
unlock_page(page);
if (pmd_young(orig_pmd) || pmd_dirty(orig_pmd)) {
- orig_pmd = pmdp_huge_get_and_clear_full(tlb->mm, addr, pmd,
- tlb->fullmm);
orig_pmd = pmd_mkold(orig_pmd);
orig_pmd = pmd_mkclean(orig_pmd);
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
rmap-fix-null-pointer-dereference-on-thp-munlocking.patch
thp-reduce-indentation-level-in-change_huge_pmd.patch
thp-fix-madv_dontneed-vs-numa-balancing-race.patch
thp-fix-madv_dontneed-vs-madv_free-race.patch
thp-fix-madv_dontneed-vs-clear-soft-dirty-race.patch
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