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author | Steven Rostedt <rostedt@goodmis.org> | 2012-03-02 15:36:57 (GMT) |
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committer | Scott Wood <scottwood@freescale.com> | 2014-04-10 00:20:00 (GMT) |
commit | 1b001aa7d16589fd95b457c6f7b91de5ad98b0c3 (patch) | |
tree | 560f52b6bb6de09b5bc5ce143b8b47d48443afd3 /kernel/sched | |
parent | e6e541ec2b28242ffd01f8641e18474b386e4473 (diff) | |
download | linux-fsl-qoriq-1b001aa7d16589fd95b457c6f7b91de5ad98b0c3.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/sched')
0 files changed, 0 insertions, 0 deletions