linux-kernel - [PATCH 2/3] core: Convert printk_once to use DO

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Date:	Tue, 15 Oct 2013 22:50:51 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Liu Chuansheng <chuansheng.liu@...el.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH 2/3] core: Convert printk_once to use DO_ONCE

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Liu Chuansheng <chuansheng.liu@...el.com>
Cc: Ingo Molnar <mingo@...nel.org>
---
 include/linux/printk.h | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index e6131a78..3c5069b 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -5,6 +5,7 @@
 #include <linux/init.h>
 #include <linux/kern_levels.h>
 #include <linux/linkage.h>
+#include <linux/once.h>
 
 extern const char linux_banner[];
 extern const char linux_proc_banner[];
@@ -252,14 +253,7 @@ extern asmlinkage void dump_stack(void) __cold;
 
 #ifdef CONFIG_PRINTK
 #define printk_once(fmt, ...)			\
-({						\
-	static bool __print_once;		\
-						\
-	if (!__print_once) {			\
-		__print_once = true;		\
-		printk(fmt, ##__VA_ARGS__);	\
-	}					\
-})
+	DO_ONCE(printk(fmt, ##__VA_ARGS__));
 #else
 #define printk_once(fmt, ...)			\
 	no_printk(fmt, ##__VA_ARGS__)
-- 
1.8.3.1

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