netdev - Re: [PATCH] netfilter: Fix compiler warning.

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Date:	Thu, 10 Dec 2009 23:06:32 +0100 (CET)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	chavey@...gle.com
cc:	davem@...emloft.net, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, eric.dumazet@...il.com,
	akpm@...gle.com
Subject: Re: [PATCH] netfilter: Fix compiler warning.


On Donnerstag 2009-12-10 22:44, chavey@...gle.com wrote:

>Fix compiler warning "discards qualifiers from pointer target type",
>by allowing explicit discard of const qualifier thru type casting.
>The const_cast() macro is taken from a patch from Kaveh R. Ghazi

Uhm, I am not getting any warning on xt_time with either gcc-4.4.1
or gcc-4.5_20091126, so what case are we actually trying to fix?

>--- a/net/netfilter/xt_time.c
>+++ b/net/netfilter/xt_time.c
>@@ -170,7 +170,7 @@ time_mt(const struct sk_buff *skb, const struct xt_match_param *par)
> 	 * it arrived at the right moment before 13:00.
> 	 */
> 	if (skb->tstamp.tv64 == 0)
>-		__net_timestamp((struct sk_buff *)skb);
>+		__net_timestamp((struct sk_buff *)const_cast(skb));
> 
> 	stamp = ktime_to_ns(skb->tstamp);
> 	stamp = div_s64(stamp, NSEC_PER_SEC);
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