locking: Remove smp_mb__before_spinlock()

Now that there are no users of smp_mb__before_spinlock() left, remove
it entirely.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 0 insertions, 13 deletions

diff --git a/include/linux/spinlock.h b/include/linux/spinlock.h
index 840281095933..4e8cce19b507 100644
--- a/include/linux/spinlock.h
+++ b/include/linux/spinlock.h
@@ -118,19 +118,6 @@ do {								\
 #endif
 
 /*
- * Despite its name it doesn't necessarily has to be a full barrier.
- * It should only guarantee that a STORE before the critical section
- * can not be reordered with LOADs and STOREs inside this section.
- * spin_lock() is the one-way barrier, this LOAD can not escape out
- * of the region. So the default implementation simply ensures that
- * a STORE can not move into the critical section, smp_wmb() should
- * serialize it with another STORE done by spin_lock().
- */
-#ifndef smp_mb__before_spinlock
-#define smp_mb__before_spinlock()       smp_wmb()
-#endif
-
-/*
  * This barrier must provide two things:
  *
  *   - it must guarantee a STORE before the spin_lock() is ordered against a