From: Andrea Arcangeli <aarcange@redhat.com>
Date: Thu, 16 Jun 2011 19:56:19 +0000 (-0700)
Subject: migrate: don't account swapcache as shmem
X-Git-Tag: v3.0-rc4~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=99a15e21d96f6857dafab1e5167e5e8183215c9c;p=pandora-kernel.git

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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