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migrate: don't account swapcache as shmem
swapcache will reach the below code path in migrate_page_move_mapping, and swapcache is accounted as NR_FILE_PAGES but it's not accounted as NR_SHMEM. Hugh pointed out we must use PageSwapCache instead of comparing mapping to &swapper_space, to avoid build failure with CONFIG_SWAP=n. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Hugh Dickins <hughd@google.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -288,7 +288,7 @@ static int migrate_page_move_mapping(struct address_space *mapping,
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*/
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__dec_zone_page_state(page, NR_FILE_PAGES);
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__inc_zone_page_state(newpage, NR_FILE_PAGES);
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if (PageSwapBacked(page)) {
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if (!PageSwapCache(page) && PageSwapBacked(page)) {
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__dec_zone_page_state(page, NR_SHMEM);
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__inc_zone_page_state(newpage, NR_SHMEM);
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}
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