linux-kernel - [PATCH] kernel.h: Remove initialization of bool in printk

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Date:	Tue, 06 Oct 2009 14:01:06 -0700
From:	Joe Perches <joe@...ches.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH] kernel.h: Remove initialization of bool in printk_once

Don't initialize __print_once
Invert the test to reduce initialized data.

defconfig before:	$size vmlinux
   text	   data	    bss	    dec	    hex	filename
6976022	 679572	1359668	9015262	 898fde	vmlinux

defconfig after:	$size vmlinux
   text	   data	    bss	    dec	    hex	filename
6976006	 679508	1359700	9015214	 898fae	vmlinux

Signed-off-by: Joe Perches <joe@...ches.com>

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index d3cd23f..344873d 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -252,10 +252,10 @@ extern int printk_delay_msec;
  * Print a one-time message (analogous to WARN_ONCE() et al):
  */
 #define printk_once(x...) ({			\
-	static bool __print_once = true;	\
+	static bool __print_once;		\
 						\
-	if (__print_once) {			\
-		__print_once = false;		\
+	if (!__print_once) {			\
+		__print_once = true;		\
 		printk(x);			\
 	}					\
 })


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