Commit 2f359c7e authored Sep 26, 2018 by Andrea Parri Committed by Ingo Molnar Oct 02, 2018

locking/memory-barriers: Replace smp_cond_acquire() with smp_cond_load_acquire()



Amend the changes in commit:

  1f03e8d2 ("locking/barriers: Replace smp_cond_acquire() with smp_cond_load_acquire()")

... by updating the documentation accordingly.

Also remove some obsolete information related to the implementation.

Signed-off-by: Andrea Parri <andrea.parri@amarulasolutions.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: Akira Yokosawa <akiyks@gmail.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Daniel Lustig <dlustig@nvidia.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Jade Alglave <j.alglave@ucl.ac.uk>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luc Maranget <luc.maranget@inria.fr>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: linux-arch@vger.kernel.org
Cc: parri.andrea@gmail.com
Link: http://lkml.kernel.org/r/20180926182920.27644-5-paulmck@linux.ibm.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent d8fa25c4

Documentation/memory-barriers.txt

+1 −2

Original line number	Original line	Diff line number	Diff line
	@@ -471,8 +471,7 @@ And a couple of implicit varieties:
	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 both smp_load_acquire()		ACQUIRE operations include LOCK operations and both smp_load_acquire()
	and smp_cond_acquire() operations. The later builds the necessary ACQUIRE		and smp_cond_load_acquire() operations.
	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.