commit 33ac279677dcc2441cb93d8cb9cf7a74df62814d
author Peter Zijlstra <peterz@infradead.org> Tue May 24 13:17:12 2016 +0200
committer Ingo Molnar <mingo@kernel.org> Tue Jun 14 11:55:14 2016 +0200
tree bcf918587b2425d1294b780b31ab67761e068e26
parent 1f03e8d2919270bd6ef64f39a45ce8df8a9f012a

locking/barriers: Introduce smp_acquire__after_ctrl_dep()

Introduce smp_acquire__after_ctrl_dep(), this construct is not
uncommon, but the lack of this barrier is.

Use it to better express smp_rmb() uses in WRITE_ONCE(), the IPC
semaphore code and the qspinlock code.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>