linux-kernel - [tip:perf/core] perf/core: Replace rcu_assign_pointer() with RCU_INIT

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Date:	Tue, 9 Sep 2014 07:53:08 -0700
From:	tip-bot for Andreea-Cristina Bernat <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, acme@...nel.org, tglx@...utronix.de,
	bernat.ada@...il.com
Subject: [tip:perf/core] perf/core: Replace rcu_assign_pointer()
  with RCU_INIT_POINTER()

Commit-ID:  70691d4a0bf7c871559d4ef1b0056edefbca123b
Gitweb:     http://git.kernel.org/tip/70691d4a0bf7c871559d4ef1b0056edefbca123b
Author:     Andreea-Cristina Bernat <bernat.ada@...il.com>
AuthorDate: Fri, 22 Aug 2014 16:26:05 +0300
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 9 Sep 2014 06:53:05 +0200

perf/core: Replace rcu_assign_pointer() with RCU_INIT_POINTER()

The use of "rcu_assign_pointer()" is NULLing out the pointer.
According to RCU_INIT_POINTER()'s block comment:

  "1.   This use of RCU_INIT_POINTER() is NULLing out the pointer"

it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.

The following Coccinelle semantic patch was used:
  @@
  @@

  - rcu_assign_pointer
  + RCU_INIT_POINTER
    (..., NULL)

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Link: http://lkml.kernel.org/r/20140822132605.GA20130@ada
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 01bd42e..f917dec 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5908,7 +5908,7 @@ static void swevent_hlist_release(struct swevent_htable *swhash)
 	if (!hlist)
 		return;
 
-	rcu_assign_pointer(swhash->swevent_hlist, NULL);
+	RCU_INIT_POINTER(swhash->swevent_hlist, NULL);
 	kfree_rcu(hlist, rcu_head);
 }
 
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