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madvise_free, thp: fix madvise_free_huge_pmd return value after splitting

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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>
This commit is contained in:
Huang Ying 2016-07-14 12:07:12 -07:00 committed by Linus Torvalds
parent ef722fd4a7
commit 9818b8cde6
1 changed files with 1 additions and 6 deletions
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7
mm/huge_memory.c
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@ -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;
}