linux-kernel - [PATCH 1/5] printk: Add eliminated

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Message-Id: <ec5015aa86e465f7b797b1fa023bd6e3b2a847be.1339985627.git.joe@perches.com>
Date:	Sun, 17 Jun 2012 19:25:08 -0700
From:	Joe Perches <joe@...ches.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 1/5] printk: Add eliminated_printk macro

no_printk keeps gcc side-effects.
Add a mechanism to eliminate the side-effects.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 include/linux/printk.h |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index 1bec2f7..84aa910 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -88,6 +88,16 @@ int no_printk(const char *fmt, ...)
 	return 0;
 }
 
+/*
+ * Dummy printk for disabled printks maintaining
+ * gcc's format checking and eliminating side-effects
+ */
+#define eliminated_printk(fmt, ...)		\
+do {						\
+	if (0)					\
+		printk(fmt, ##__VA_ARGS__);	\
+} while (0)
+
 extern asmlinkage __printf(1, 2)
 void early_printk(const char *fmt, ...);
 
-- 
1.7.8.111.gad25c.dirty

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