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mm: remove SWAP_MLOCK check for SWAP_SUCCESS in ttu

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If the page is mapped and rescue in try_to_unmap_one, the
page_mapcount() of a page cannot be zero, so the page_mapcount check in
try_to_unmap is enough to return SWAP_SUCCESS.  IOW, SWAP_MLOCK check is
redundant so remove it.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Minchan Kim <[email protected]>
Cc: Anshuman Khandual <[email protected]>
Cc: Hillf Danton <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2017-05-03 14:54:07 -07:00 • committed by Linus Torvalds
commit 22ffb33f46
1 changed files with 1 additions and 1 deletions
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2
mm/rmap.c
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@ -1535,7 +1535,7 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
else
ret = rmap_walk(page, &rwc);
if (ret != SWAP_MLOCK && !page_mapcount(page))
if (!page_mapcount(page))
ret = SWAP_SUCCESS;
return ret;
}