diff options
author | Steven Rostedt <rostedt@goodmis.org> | 2012-03-02 10:36:57 -0500 |
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committer | Clark Williams <williams@redhat.com> | 2012-03-13 12:40:20 -0500 |
commit | 9d230dc2583df487d070394ef95dd314f1bce13e (patch) | |
tree | f32f3bb2513e1079108da468c142349a8930f1c4 /block | |
parent | 4fbdbb6ed9586fa029ed710e3af0d883c31ad26f (diff) |
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 'block')
0 files changed, 0 insertions, 0 deletions