mutex: Use p->on_cpu for the adaptive spin

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

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index 94b48bd40dd7..c75471db576e 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -51,7 +51,7 @@ struct mutex {
         spinlock_t              wait_lock;
         struct list_head        wait_list;
 #if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP)
-        struct thread_info      *owner;
+        struct task_struct      *owner;
 #endif
 #ifdef CONFIG_DEBUG_MUTEXES
         const char              *name;