linux-kernel - [PATCH] ext4: address a benign compiler warning

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Message-Id: <1392257593-3736-1-git-send-email-patrick@parcs.ath.cx>
Date:	Wed, 12 Feb 2014 21:13:13 -0500
From:	Patrick Palka <patrick@...cs.ath.cx>
To:	linux-kernel@...r.kernel.org
Cc:	tytso@....edu, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, Patrick Palka <patrick@...cs.ath.cx>
Subject: [PATCH] ext4: address a benign compiler warning

When !defined(CONFIG_EXT4_DEBUG), mb_debug() should be defined as an
empty do-while statement so as to suppress the following compiler
warning:

fs/ext4/mballoc.c: In function ‘ext4_mb_cleanup_pa’:
fs/ext4/mballoc.c:2659:47: warning: suggest braces around empty body in an ‘if’ statement [-Wempty-body]
   mb_debug(1, "mballoc: %u PAs left\n", count);

Signed-off-by: Patrick Palka <patrick@...cs.ath.cx>
---
 fs/ext4/mballoc.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h
index 08481ee..92eeb98 100644
--- a/fs/ext4/mballoc.h
+++ b/fs/ext4/mballoc.h
@@ -48,7 +48,7 @@ extern ushort ext4_mballoc_debug;
 		}							\
 	} while (0)
 #else
-#define mb_debug(n, fmt, a...)
+#define mb_debug(n, fmt, a...)		do { } while (0)
 #endif
 
 #define EXT4_MB_HISTORY_ALLOC		1	/* allocation */
-- 
1.9.0.rc3

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