linux-kernel - [PATCH 3.11 17/66] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG

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Date:	Fri,  1 Nov 2013 15:06:53 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Olof Johansson <olof@...om.net>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.11 17/66] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG_INET are not selected

3.11-stable review patch.  If anyone has any objections, please let me know.

------------------

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

[ Upstream commit cb03db9d0e964568407fb08ea46cc2b6b7f67587 ]

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/secure_seq.c |    2 ++
 1 file changed, 2 insertions(+)

--- 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)

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