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mutex: Use p->on_cpu for the adaptive spin

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Since we now have p->on_cpu unconditionally available, use it to
re-implement mutex_spin_on_owner.

Requested-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frank Rowand <frank.rowand@am.sony.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110405152728.826338173@chello.nl
This commit is contained in:
Peter Zijlstra 2011-04-05 17:23:41 +02:00 • committed by Ingo Molnar
parent 3ca7a440da
commit c6eb3dda25
7 changed files with 40 additions and 57 deletions
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2
kernel/mutex.c
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@ -160,7 +160,7 @@ __mutex_lock_common(struct mutex *lock, long state, unsigned int subclass,
*/
for (;;) {
struct thread_info *owner;
struct task_struct *owner;
/*
* If we own the BKL, then don't spin. The owner of