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| author | Peter Zijlstra <peterz@infradead.org> | 2016-05-24 13:17:12 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-06-14 11:55:14 +0200 |
| commit | 33ac279677dcc2441cb93d8cb9cf7a74df62814d (patch) | |
| tree | bcf918587b2425d1294b780b31ab67761e068e26 /kernel/locking | |
| parent | 1f03e8d2919270bd6ef64f39a45ce8df8a9f012a (diff) | |
| download | op-kernel-dev-33ac279677dcc2441cb93d8cb9cf7a74df62814d.zip op-kernel-dev-33ac279677dcc2441cb93d8cb9cf7a74df62814d.tar.gz | |
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>
Diffstat (limited to 'kernel/locking')
| -rw-r--r-- | kernel/locking/qspinlock.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c index 1b8dda9..7306555 100644 --- a/kernel/locking/qspinlock.c +++ b/kernel/locking/qspinlock.c @@ -379,7 +379,7 @@ void queued_spin_unlock_wait(struct qspinlock *lock) cpu_relax(); done: - smp_rmb(); /* CTRL + RMB -> ACQUIRE */ + smp_acquire__after_ctrl_dep(); } EXPORT_SYMBOL(queued_spin_unlock_wait); #endif |
