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authorHuang Ying <ying.huang@intel.com>2016-07-14 12:07:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-15 14:54:27 +0900
commit9818b8cde6221fe7a52aad816425f67d4439b14e (patch)
tree47e2d3bfcbbbfdeb5a0211d1924330407f4b11ef /mm/huge_memory.c
parentef722fd4a7592ddbfa42bcb3ad8a5caa598589b3 (diff)
downloadlwn-9818b8cde6221fe7a52aad816425f67d4439b14e.tar.gz
lwn-9818b8cde6221fe7a52aad816425f67d4439b14e.zip
madvise_free, thp: fix madvise_free_huge_pmd return value after splitting
madvise_free_huge_pmd should return 0 if the fallback PTE operations are required. In madvise_free_huge_pmd, if part pages of THP are discarded, the THP will be split and fallback PTE operations should be used if splitting succeeds. But the original code will make fallback PTE operations skipped, after splitting succeeds. Fix that via make madvise_free_huge_pmd return 0 after splitting successfully, so that the fallback PTE operations will be done. Link: http://lkml.kernel.org/r/1467135452-16688-1-git-send-email-ying.huang@intel.com Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Acked-by: Minchan Kim <minchan@kernel.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Ebru Akagunduz <ebru.akagunduz@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c7
1 files changed, 1 insertions, 6 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 9ed58530f695..55940d173318 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1624,14 +1624,9 @@ int madvise_free_huge_pmd(struct mmu_gather *tlb, struct vm_area_struct *vma,
if (next - addr != HPAGE_PMD_SIZE) {
get_page(page);
spin_unlock(ptl);
- if (split_huge_page(page)) {
- put_page(page);
- unlock_page(page);
- goto out_unlocked;
- }
+ split_huge_page(page);
put_page(page);
unlock_page(page);
- ret = 1;
goto out_unlocked;
}