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locking/Documentation: Mention smp_cond_acquire() 

... do this next to smp_load_acquire() when first mentioning
ACQUIRE. While this call is briefly explained and control
dependencies are mentioned later, it does not hurt the reader.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: bobby.prani@gmail.com
Cc: dhowells@redhat.com
Cc: dipankar@in.ibm.com
Cc: dvhart@linux.intel.com
Cc: edumazet@google.com
Cc: fweisbec@gmail.com
Cc: jiangshanlai@gmail.com
Cc: josh@joshtriplett.org
Cc: mathieu.desnoyers@efficios.com
Cc: oleg@redhat.com
Cc: rostedt@goodmis.org
Link: http://lkml.kernel.org/r/1460476375-27803-7-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Davidlohr Bueso 2016-04-12 08:52:55 -07:00 committed by Ingo Molnar
parent 0b6fa347dc
commit 787df6383c
1 changed files with 3 additions and 2 deletions
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5
Documentation/memory-barriers.txt
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@ -431,8 +431,9 @@ And a couple of implicit varieties:
This acts as a one-way permeable barrier. It guarantees that all memory This acts as a one-way permeable barrier. It guarantees that all memory
operations after the ACQUIRE operation will appear to happen after the operations after the ACQUIRE operation will appear to happen after the
ACQUIRE operation with respect to the other components of the system. ACQUIRE operation with respect to the other components of the system.
ACQUIRE operations include LOCK operations and smp_load_acquire() ACQUIRE operations include LOCK operations and both smp_load_acquire()
operations. and smp_cond_acquire() operations. The later builds the necessary ACQUIRE
semantics from relying on a control dependency and smp_rmb().
Memory operations that occur before an ACQUIRE operation may appear to Memory operations that occur before an ACQUIRE operation may appear to
happen after it completes. happen after it completes.