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| author | Nick Piggin <piggin@cyberone.com.au> | 2006-04-10 11:21:48 +1000 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-10 10:16:37 -0700 |
| commit | 676165a8af7167f488abdcce6851a9bc36e83254 (patch) | |
| tree | a9b2b8dc155b48ce073b5ada31f2ac0694118e69 /drivers/scsi/scsi_error.c | |
| parent | c3a9d6541f84ac3ff566982d08389b87c1c36b4e (diff) | |
| download | blackbird-obmc-linux-676165a8af7167f488abdcce6851a9bc36e83254.tar.gz blackbird-obmc-linux-676165a8af7167f488abdcce6851a9bc36e83254.zip | |
[PATCH] Fix buddy list race that could lead to page lru list corruptions
Rohit found an obscure bug causing buddy list corruption.
page_is_buddy is using a non-atomic test (PagePrivate && page_count == 0)
to determine whether or not a free page's buddy is itself free and in the
buddy lists.
Each of the conjuncts may be true at different times due to unrelated
conditions, so the non-atomic page_is_buddy test may find each conjunct to
be true even if they were not both true at the same time (ie. the page was
not on the buddy lists).
Signed-off-by: Martin Bligh <mbligh@google.com>
Signed-off-by: Rohit Seth <rohitseth@google.com>
Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
0 files changed, 0 insertions, 0 deletions
