linux-kernel - [PATCH 3.8 22/91] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG

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Date:	Thu,  7 Nov 2013 18:14:37 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Fabio Estevam <fabio.estevam@...escale.com>,
	"David S. Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.8 22/91] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG_INET are not selected

3.8.13.13 -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

$ 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>
[ kamal: backport to 3.8 (context) ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 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 e61a8bb..53fcc11 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)
 static u32 net_secret[MD5_MESSAGE_BYTES / 4] ____cacheline_aligned;

 static int __init net_secret_init(void)
@@ -18,6 +19,7 @@ static int __init net_secret_init(void)
 	return 0;
 }
 late_initcall(net_secret_init);
+#endif

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

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