[PATCH 3.8 22/91] net: secure_seq: Fix warning when CONFIG_IPV6 and CONFIG_INET are not selected

[Kamal Mostafa]

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

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

From: Fabio Estevam <fabio.estevam at freescale.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 at lixom.net>
Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
[ kamal: backport to 3.8 (context) ]
Signed-off-by: Kamal Mostafa <kamal at canonical.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