linux-kernel - [tip:locking/core] locking/rwsem: Document barrier need when waking tasks

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Date:	Wed, 18 Feb 2015 09:11:38 -0800
From:	tip-bot for Davidlohr Bueso <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	tim.c.chen@...ux.intel.com, linux-kernel@...r.kernel.org,
	mingo@...nel.org, jason.low2@...com, hpa@...or.com,
	walken@...gle.com, torvalds@...ux-foundation.org,
	paulmck@...ux.vnet.ibm.com, dbueso@...e.de, peterz@...radead.org,
	tglx@...utronix.de, dave@...olabs.net
Subject: [tip:locking/core] locking/rwsem:
  Document barrier need when waking tasks

Commit-ID:  49e4b2bcf7b812e985e65b6c8a0255b1520a6e7e
Gitweb:     http://git.kernel.org/tip/49e4b2bcf7b812e985e65b6c8a0255b1520a6e7e
Author:     Davidlohr Bueso <dave@...olabs.net>
AuthorDate: Fri, 30 Jan 2015 01:14:24 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 18 Feb 2015 16:57:10 +0100

locking/rwsem: Document barrier need when waking tasks

The need for the smp_mb() in __rwsem_do_wake() should be
properly documented. Applies to both xadd and spinlock
variants.

Signed-off-by: Davidlohr Bueso <dbueso@...e.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Jason Low <jason.low2@...com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Michel Lespinasse <walken@...gle.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Link: http://lkml.kernel.org/r/1422609267-15102-3-git-send-email-dave@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/locking/rwsem-spinlock.c | 7 +++++++
 kernel/locking/rwsem-xadd.c     | 7 +++++++
 2 files changed, 14 insertions(+)

diff --git a/kernel/locking/rwsem-spinlock.c b/kernel/locking/rwsem-spinlock.c
index 2555ae1..3a50485 100644
--- a/kernel/locking/rwsem-spinlock.c
+++ b/kernel/locking/rwsem-spinlock.c
@@ -85,6 +85,13 @@ __rwsem_do_wake(struct rw_semaphore *sem, int wakewrite)
 
 		list_del(&waiter->list);
 		tsk = waiter->task;
+		/*
+		 * Make sure we do not wakeup the next reader before
+		 * setting the nil condition to grant the next reader;
+		 * otherwise we could miss the wakeup on the other
+		 * side and end up sleeping again. See the pairing
+		 * in rwsem_down_read_failed().
+		 */
 		smp_mb();
 		waiter->task = NULL;
 		wake_up_process(tsk);
diff --git a/kernel/locking/rwsem-xadd.c b/kernel/locking/rwsem-xadd.c
index 2f7cc40..82aba46 100644
--- a/kernel/locking/rwsem-xadd.c
+++ b/kernel/locking/rwsem-xadd.c
@@ -186,6 +186,13 @@ __rwsem_do_wake(struct rw_semaphore *sem, enum rwsem_wake_type wake_type)
 		waiter = list_entry(next, struct rwsem_waiter, list);
 		next = waiter->list.next;
 		tsk = waiter->task;
+		/*
+		 * Make sure we do not wakeup the next reader before
+		 * setting the nil condition to grant the next reader;
+		 * otherwise we could miss the wakeup on the other
+		 * side and end up sleeping again. See the pairing
+		 * in rwsem_down_read_failed().
+		 */
 		smp_mb();
 		waiter->task = NULL;
 		wake_up_process(tsk);
--
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