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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-04-29 02:18:27 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-04-29 05:34:04 +0300
commitaa88b68c3b1dce8bc3fd54c8a7372a777ff265cd (patch)
tree98ad92a044b6a2f39a8fa4c1c24df001108bd1a8 /include/linux/huge_mm.h
parent66ee95d16a7f1b7b4f1dd74a2d81c6e19dc29a14 (diff)
downloadlinux-aa88b68c3b1dce8bc3fd54c8a7372a777ff265cd.tar.xz
thp: keep huge zero page pinned until tlb flush
Andrea has found[1] a race condition on MMU-gather based TLB flush vs split_huge_page() or shrinker which frees huge zero under us (patch 1/2 and 2/2 respectively). With new THP refcounting, we don't need patch 1/2: mmu_gather keeps the page pinned until flush is complete and the pin prevents the page from being split under us. We still need patch 2/2. This is simplified version of Andrea's patch. We don't need fancy encoding. [1] http://lkml.kernel.org/r/1447938052-22165-1-git-send-email-aarcange@redhat.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reported-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/huge_mm.h')
-rw-r--r--include/linux/huge_mm.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index 7008623e24b1..d7b9e5346fba 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -152,6 +152,7 @@ static inline bool is_huge_zero_pmd(pmd_t pmd)
}
struct page *get_huge_zero_page(void);
+void put_huge_zero_page(void);
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
#define HPAGE_PMD_SHIFT ({ BUILD_BUG(); 0; })
@@ -208,6 +209,10 @@ static inline bool is_huge_zero_page(struct page *page)
return false;
}
+static inline void put_huge_zero_page(void)
+{
+ BUILD_BUG();
+}
static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
unsigned long addr, pmd_t *pmd, int flags)