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23 October 2021, 00:29:24 UTC
Revision 872c63fbf9e153146b07f0cece4da0d70b283eeb authored by Will Deacon on 05 September 2016, 10:56:05 UTC, committed by Catalin Marinas on 09 September 2016, 11:33:48 UTC 
arm64: spinlocks: implement smp_mb__before_spinlock() as smp_mb()
 
smp_mb__before_spinlock() is intended to upgrade a spin_lock() operation
to a full barrier, such that prior stores are ordered with respect to
loads and stores occuring inside the critical section.

Unfortunately, the core code defines the barrier as smp_wmb(), which
is insufficient to provide the required ordering guarantees when used in
conjunction with our load-acquire-based spinlock implementation.

This patch overrides the arm64 definition of smp_mb__before_spinlock()
to map to a full smp_mb().

Cc: <stable@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Reported-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
1 parent c693593
History
Tip revision: 872c63fbf9e153146b07f0cece4da0d70b283eeb authored by Will Deacon on 05 September 2016, 10:56:05 UTC
arm64: spinlocks: implement smp_mb__before_spinlock() as smp_mb()
Tip revision: 872c63f
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