linux-kernel - [tip:perf/urgent] perf_event: Clean up __perf_event_init

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Date:	Wed, 9 Dec 2009 09:52:11 GMT
From:	tip-bot for Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulus@...ba.org, hpa@...or.com,
	mingo@...hat.com, peterz@...radead.org,
	xiaoguangrong@...fujitsu.com, fweisbec@...il.com,
	tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf_event: Clean up __perf_event_init_context()

Commit-ID:  aa5452d70c0d559310598b243b8b1033c10056e7
Gitweb:     http://git.kernel.org/tip/aa5452d70c0d559310598b243b8b1033c10056e7
Author:     Xiao Guangrong <xiaoguangrong@...fujitsu.com>
AuthorDate: Wed, 9 Dec 2009 11:28:13 +0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 9 Dec 2009 09:56:27 +0100

perf_event: Clean up __perf_event_init_context()

Clean up the code a bit:

 - define 'perf_cpu_context' variable with 'static'
 - use kzalloc() instead of kmalloc() and memset()

Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Reviewed-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Paul Mackerras <paulus@...ba.org>
LKML-Reference: <4B1F194D.7080306@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/perf_event.c |    7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 3b0cf86..2b06c45 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -36,7 +36,7 @@
 /*
  * Each CPU has a list of per CPU events:
  */
-DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
+static DEFINE_PER_CPU(struct perf_cpu_context, perf_cpu_context);
 
 int perf_max_events __read_mostly = 1;
 static int perf_reserved_percpu __read_mostly;
@@ -1579,7 +1579,6 @@ static void
 __perf_event_init_context(struct perf_event_context *ctx,
 			    struct task_struct *task)
 {
-	memset(ctx, 0, sizeof(*ctx));
 	spin_lock_init(&ctx->lock);
 	mutex_init(&ctx->mutex);
 	INIT_LIST_HEAD(&ctx->group_list);
@@ -1654,7 +1653,7 @@ static struct perf_event_context *find_get_context(pid_t pid, int cpu)
 	}
 
 	if (!ctx) {
-		ctx = kmalloc(sizeof(struct perf_event_context), GFP_KERNEL);
+		ctx = kzalloc(sizeof(struct perf_event_context), GFP_KERNEL);
 		err = -ENOMEM;
 		if (!ctx)
 			goto errout;
@@ -5105,7 +5104,7 @@ int perf_event_init_task(struct task_struct *child)
 	 * First allocate and initialize a context for the child.
 	 */
 
-	child_ctx = kmalloc(sizeof(struct perf_event_context), GFP_KERNEL);
+	child_ctx = kzalloc(sizeof(struct perf_event_context), GFP_KERNEL);
 	if (!child_ctx)
 		return -ENOMEM;
 
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