Mel Gorman ee95c1dd19 mempolicy: fix a race in shared_policy_replace() ... commit b22d127a39 upstream. shared_policy_replace() use of sp_alloc() is unsafe. 1) sp_node cannot be dereferenced if sp->lock is not held and 2) another thread can modify sp_node between spin_unlock for allocating a new sp node and next spin_lock. The bug was introduced before 2.6.12-rc2. Kosaki's original patch for this problem was to allocate an sp node and policy within shared_policy_replace and initialise it when the lock is reacquired. I was not keen on this approach because it partially duplicates sp_alloc(). As the paths were sp->lock is taken are not that performance critical this patch converts sp->lock to sp->mutex so it can sleep when calling sp_alloc(). [kosaki.motohiro@jp.fujitsu.com: Original patch] Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Reviewed-by: Christoph Lameter <cl@linux.com> Cc: Josh Boyer <jwboyer@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-10-13 05:47:21 +09:00
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acpi	ACPI: fix acpi_bus.h build warnings when ACPI is not enabled	2012-06-04 00:29:11 -04:00
asm-generic	mutex: Place lock in contended state after fastpath_lock failure	2012-10-02 10:39:39 -07:00
crypto
drm	drm: Check for invalid cursor flags	2012-10-02 10:39:41 -07:00
keys	KEYS: Permit in-place link replacement in keyring list	2012-05-11 10:56:56 +01:00
linux	mempolicy: fix a race in shared_policy_replace()	2012-10-13 05:47:21 +09:00
math-emu
media	[media] patch for Asus My Cinema PS3-100 (1043:48cd)	2012-05-20 16:05:02 -03:00
memory	ddr: add LPDDR2 data from JESD209-2	2012-05-02 00:04:06 -07:00
misc
mtd	UBI: amend commentaries WRT dtype	2012-05-20 20:25:59 +03:00
net	xfrm: Workaround incompatibility of ESN and async crypto	2012-10-13 05:46:58 +09:00
pcmcia
rdma	Merge branches 'core', 'cxgb4', 'ipath', 'iser', 'lockdep', 'mlx4', 'nes', 'ocrdma', 'qib' and 'raw-qp' into for-linus	2012-05-21 09:00:47 -07:00
rxrpc
scsi	[SCSI] libsas: fix taskfile corruption in sas_ata_qc_fill_rtf	2012-07-08 09:49:14 +01:00
sound	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-06-25 14:53:09 -07:00
target	target: Add generation of LOGICAL BLOCK ADDRESS OUT OF RANGE	2012-08-09 08:22:35 -07:00
trace	tracing: Don't call page_to_pfn() if page is NULL	2012-10-02 10:39:25 -07:00
video	fbdev updates for 3.5	2012-06-01 16:57:51 -07:00
xen	xen/m2p: do not reuse kmap_op->dev_bus_addr	2012-10-02 10:39:12 -07:00
Kbuild