netdev - [PATCH v2] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG

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Message-Id: <1381006619-17126-2-git-send-email-festevam@gmail.com>
Date:	Sat,  5 Oct 2013 17:56:59 -0300
From:	Fabio Estevam <festevam@...il.com>
To:	davem@...emloft.net
Cc:	edumazet@...gle.com, hannes@...essinduktion.org,
	netdev@...r.kernel.org, olof@...om.net,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH v2] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG_INET are not selected

From: Fabio Estevam <fabio.estevam@...escale.com>

net_secret() is only used when CONFIG_IPV6 or CONFIG_INET are selected.

Building a defconfig with both of these symbols unselected (Using the ARM
at91sam9rl_defconfig, for example) leads to the following build warning:

$ make at91sam9rl_defconfig
#
# configuration written to .config
#

$ make net/core/secure_seq.o
scripts/kconfig/conf --silentoldconfig Kconfig
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
make[1]: `include/generated/mach-types.h' is up to date.
  CALL    scripts/checksyscalls.sh
  CC      net/core/secure_seq.o
net/core/secure_seq.c:17:13: warning: 'net_secret_init' defined but not used [-Wunused-function]

Fix this warning by protecting the definition of net_secret() with these
symbols.

Reported-by: Olof Johansson <olof@...om.net>
Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
---
Changes since v1:
- Add #if IS_ENABLED(CONFIG_IPV6) || IS_ENABLED(CONFIG_INET)

 net/core/secure_seq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/secure_seq.c b/net/core/secure_seq.c
index 3f1ec15..8d9d05e 100644
--- a/net/core/secure_seq.c
+++ b/net/core/secure_seq.c
@@ -10,6 +10,7 @@

 #include <net/secure_seq.h>

+#if IS_ENABLED(CONFIG_IPV6) || IS_ENABLED(CONFIG_INET)
 #define NET_SECRET_SIZE (MD5_MESSAGE_BYTES / 4)

 static u32 net_secret[NET_SECRET_SIZE] ____cacheline_aligned;
@@ -29,6 +30,7 @@ static void net_secret_init(void)
 		cmpxchg(&net_secret[--i], 0, tmp);
 	}
 }
+#endif

 #ifdef CONFIG_INET
 static u32 seq_scale(u32 seq)
-- 
1.8.1.2

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