diff options
| author | Steven Rostedt <rostedt@goodmis.org> | 2012-03-02 10:36:57 -0500 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-03-07 16:15:17 -0600 |
| commit | 92e75c2bb18e3c2ce6b87ced0536aa4364c6fd3d (patch) | |
| tree | 6463b2211bd6637acd6d562207ca50802c812c19 /net/core/dev.c | |
| parent | 5f25b6c84f879390a5e5587234699d26e2ea756d (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 'net/core/dev.c')
0 files changed, 0 insertions, 0 deletions