Peter Zijlstra e194fab8d7 sched: Fix race in task_group() ... commit 8323f26ce3 upstream. Stefan reported a crash on a kernel before a3e5d1091c ("sched: Don't call task_group() too many times in set_task_rq()"), he found the reason to be that the multiple task_group() invocations in set_task_rq() returned different values. Looking at all that I found a lack of serialization and plain wrong comments. The below tries to fix it using an extra pointer which is updated under the appropriate scheduler locks. Its not pretty, but I can't really see another way given how all the cgroup stuff works. Reported-and-tested-by: Stefan Bader <stefan.bader@canonical.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1340364965.18025.71.camel@twins Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2012-10-02 10:30:35 -07:00
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acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-05-05 10:06:06 -07:00
asm-generic	mutex: Place lock in contended state after fastpath_lock failure	2012-10-02 10:30:21 -07:00
crypto	crypto: user - Fix lookup of algorithms with IV generator	2012-03-29 19:52:47 +08:00
drm	drm: Check for invalid cursor flags	2012-10-02 10:30:23 -07:00
keys
linux	sched: Fix race in task_group()	2012-10-02 10:30:35 -07:00
math-emu
media	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-05-14 11:23:37 -07:00
misc
mtd
net	Bluetooth: Change signature of smp_conn_security()	2012-10-02 10:30:34 -07:00
pcmcia
rdma	Merge branches 'cma', 'cxgb3', 'cxgb4', 'ehca', 'iser', 'mad', 'nes', 'qib', 'srp' and 'srpt' into for-next	2012-03-19 09:50:33 -07:00
rxrpc
scsi	SCSI: libsas: fix taskfile corruption in sas_ata_qc_fill_rtf	2012-07-16 09:04:37 -07:00
sound	ALSA: hda - hide HDMI/ELD printks unless snd.debug=2	2012-04-10 14:53:55 +02:00
target	target: Add generation of LOGICAL BLOCK ADDRESS OUT OF RANGE	2012-08-09 08:31:26 -07:00
trace	tracing: Don't call page_to_pfn() if page is NULL	2012-10-02 10:30:08 -07:00
video	Merge branch 'platforms' of git://git.linaro.org/people/rmk/linux-arm	2012-03-27 18:17:02 -07:00
xen	xen/m2p: do not reuse kmap_op->dev_bus_addr	2012-10-02 10:30:06 -07:00
Kbuild