tree eb6224c0bf11fc243de298c3fa665e418f849d16
parent 7cc2ed05891f424c2e323bc1a368ddb5c78b90f2
author Andrea Arcangeli <aarcange@redhat.com> 1308254179 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> 1308261684 -0700

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>