From: Hugh Dickins <hughd@google.com>
Date: Fri, 20 May 2011 22:47:33 +0000 (-0700)
Subject: tmpfs: fix highmem swapoff crash regression
X-Git-Tag: v2.6.39.1~165
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=20276a0718c8c01db6f358225b783d1da2134580;p=pandora-kernel.git

tmpfs: fix highmem swapoff crash regression

commit e6c9366b2adb52cba64b359b3050200743c7568c upstream.

Commit 778dd893ae78 ("tmpfs: fix race between umount and swapoff")
forgot the new rules for strict atomic kmap nesting, causing

  WARNING: at arch/x86/mm/highmem_32.c:81

from __kunmap_atomic(), then

  BUG: unable to handle kernel paging request at fffb9000

from shmem_swp_set() when shmem_unuse_inode() is handling swapoff with
highmem in use.  My disgrace again.

See
  https://bugzilla.kernel.org/show_bug.cgi?id=35352

Reported-by: Witold Baryluk <baryluk@smp.if.uj.edu.pl>
Signed-off-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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