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locking: Remove smp_mb__before_spinlock()

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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>
This commit is contained in:
Peter Zijlstra
2017-06-07 17:51:27 +02:00
committed by Ingo Molnar
parent d89e588ca4
commit a9668cd6ee
6 changed files with 13 additions and 51 deletions
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13
include/linux/spinlock.h
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@@ -117,19 +117,6 @@ do { \
#endif /*arch_spin_is_contended*/
#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:
*