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Date:	Wed, 19 Aug 2015 09:40:03 +0200
From:	Jiri Benc <>
To:	Ying Xue <>
Cc:	<>, <>,
	<>, <>
Subject: Re: [PATCH] lwtunnel: Fix the sparse warnings in fib_encap_match

On Wed, 19 Aug 2015 15:33:29 +0800, Ying Xue wrote:
> 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 <>
> Reported-by: kbuild test robot <>
> Signed-off-by: Ying Xue <>

Acked-by: Jiri Benc <>

Thanks, you beat me to it.

This is for net-next.


Jiri Benc
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