netdev - [PATCH] lwtunnel: Fix the sparse warnings in fib_encap

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Message-ID: <1439969609-11189-1-git-send-email-ying.xue@windriver.com>
Date:	Wed, 19 Aug 2015 15:33:29 +0800
From:	Ying Xue <ying.xue@...driver.com>
To:	<netdev@...r.kernel.org>
CC:	<davem@...emloft.net>, <jbenc@...hat.com>,
	<fengguang.wu@...el.com>, <kbuild-all@...org>
Subject: [PATCH] lwtunnel: Fix the sparse warnings in fib_encap_match

When CONFIG_LWTUNNEL config is not enabled, the lwtstate_free() is not
declared in lwtunnel.h at all. However, even in this case, the function
is still referenced in fib_semantics.c so that there appears the
following sparse warnings:

net/ipv4/fib_semantics.c:553:17: error: undefined identifier 'lwtstate_free'
  CC      net/ipv4/fib_semantics.o
  net/ipv4/fib_semantics.c: In function ‘fib_encap_match’:
  net/ipv4/fib_semantics.c:553:3: error: implicit declaration of function ‘lwtstate_free’ [-Werror=implicit-function-declaration]
  cc1: some warnings being treated as errors
  make[1]: *** [net/ipv4/fib_semantics.o] Error 1
  make: *** [net/ipv4/fib_semantics.o] Error 2

To eliminate the error, we define an empty function for lwtstate_free()
in lwtunnel.h when CONFIG_LWTUNNEL is disabled.

Fixes: df383e6240ef ("lwtunnel: fix memory leak")
Cc: Jiri Benc <jbenc@...hat.com>
Reported-by: kbuild test robot <fengguang.wu@...el.com>
Signed-off-by: Ying Xue <ying.xue@...driver.com>
---
 include/net/lwtunnel.h |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/net/lwtunnel.h b/include/net/lwtunnel.h
index 34fd8f7..cfee539 100644
--- a/include/net/lwtunnel.h
+++ b/include/net/lwtunnel.h
@@ -93,6 +93,10 @@ int lwtunnel_input6(struct sk_buff *skb);
 
 #else
 
+static inline void lwtstate_free(struct lwtunnel_state *lws)
+{
+}
+
 static inline struct lwtunnel_state *
 lwtstate_get(struct lwtunnel_state *lws)
 {
-- 
1.7.9.5

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