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| author | Steven Rostedt <rostedt@goodmis.org> | 2012-03-02 15:36:57 (GMT) |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2013-04-04 22:09:34 (GMT) |
| commit | bccf7742b7f3b50cbc0087663f5e1bddf88e54af (patch) | |
| tree | 29fab77034511d6d10338c4079dee94b155aad07 /kernel/groups.c | |
| parent | 5673cd604eeee718e563f6a551a82e7cb48df7d5 (diff) | |
| download | linux-fsl-qoriq-bccf7742b7f3b50cbc0087663f5e1bddf88e54af.tar.xz | |
cpu: Make hotplug.lock a "sleeping" spinlock on RT
Tasks can block on hotplug.lock in pin_current_cpu(), but their state
might be != RUNNING. So the mutex wakeup will set the state
unconditionally to RUNNING. That might cause spurious unexpected
wakeups. We could provide a state preserving mutex_lock() function,
but this is semantically backwards. So instead we convert the
hotplug.lock() to a spinlock for RT, which has the state preserving
semantics already.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Carsten Emde <C.Emde@osadl.org>
Cc: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Clark Williams <clark.williams@gmail.com>
Cc: stable-rt@vger.kernel.org
Link: http://lkml.kernel.org/r/1330702617.25686.265.camel@gandalf.stny.rr.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/groups.c')
0 files changed, 0 insertions, 0 deletions