RE: [PATCH 15/19] sunrpc: don't warn for unused variable 'buf'

-----Original Message-----
From: Arnd Bergmann [mailto:arnd@arndb.de]
Sent: Friday, January 25, 2013 5:44 PM
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org; Arnd Bergmann; J. Bruce Fields;
Myklebust, Trond; linux-nfs@vger.kernel.org; netdev@vger.kernel.org
Subject: [PATCH 15/19] sunrpc: don't warn for unused variable 'buf'

When RPC_DEBUG is unset, the dprintk() macro does nothing, causing the
'buf' variable in svc_printk to become unused.
Marking it as __maybe_unused avoids a harmless gcc warning.

Without this patch, building at91_dt_defconfig results in:

net/sunrpc/svc.c: In function 'svc_printk':
net/sunrpc/svc.c:1051:7: warning: unused variable 'buf' [-Wunused-variable]

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: "J. Bruce Fields" <redacted>
Cc: Trond Myklebust <redacted>
Cc: linux-nfs@vger.kernel.org
Cc: netdev@vger.kernel.org
---
 net/sunrpc/svc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index dbf12ac..b1f5223

100644

--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c

@@ -1047,7 +1047,7 @@ void svc_printk(struct svc_rqst *rqstp, const char

*fmt, ...)  {
 	struct va_format vaf;
 	va_list args;
-	char 	buf[RPC_MAX_ADDRBUFLEN];
+	char buf[RPC_MAX_ADDRBUFLEN] __maybe_unused;

 	va_start(args, fmt);