linux-kernel - Re: [PATCH 05/13] net: Mark function as static in core/filter.c

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Date:	Sat, 8 Feb 2014 12:09:52 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	Rashika Kheria <rashika.kheria@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>,
	Daniel Borkmann <dborkman@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 05/13] net: Mark function as static in core/filter.c

On Sun, Feb 09, 2014 at 01:25:05AM +0530, Rashika Kheria wrote:
> Mark function as static in core/filter.c because it is not used outside
> this file.
> 
> This eliminates the following warning in core/filter.c:
> net/core/filter.c:48:7: warning: no previous prototype for ‘bpf_internal_load_pointer_neg_helper’ [-Wmissing-prototypes]
> 
> Signed-off-by: Rashika Kheria <rashika.kheria@...il.com>

This function actually is used outside this file, just not from C code;
a couple of assembly files call it.  (See also the comment above this
definition: "Exported for the bpf jit load helper.")

I'd suggest prototyping this function in include/linux/filter.h , unless
someone on CC has another preference.

>  net/core/filter.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/net/core/filter.c b/net/core/filter.c
> index ad30d62..a022dad 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -44,7 +44,8 @@
>   *
>   * Exported for the bpf jit load helper.
>   */
> -void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, int k, unsigned int size)
> +static void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
> +						  int k, unsigned int size)
>  {
>  	u8 *ptr = NULL;
>  
> -- 
> 1.7.9.5
> 
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