diff options
author | Steven Rostedt <rostedt@goodmis.org> | 2012-03-02 10:36:57 -0500 |
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committer | Steven Rostedt <rostedt@rostedt.homelinux.com> | 2012-10-26 14:31:52 -0400 |
commit | 3050d6f3fdf3c61d060212196cfe05d4605217f8 (patch) | |
tree | 26bc3f785b835acab7009ab9e1c4fbee666bba03 /include | |
parent | dfd4330b3b9b3abf6b915e9d191149893a1c6d92 (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 'include')
0 files changed, 0 insertions, 0 deletions