netdev - Re: [PATCH net-next] ipv4: use a 64bit load/store in output path

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Message-Id: <20111201.014813.1241057161065435427.davem@davemloft.net>
Date:	Thu, 01 Dec 2011 01:48:13 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] ipv4: use a 64bit load/store in output path

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 01 Dec 2011 06:00:53 +0100

> gcc compiler is smart enough to use a single load/store if we
> memcpy(dptr, sptr, 8) on x86_64, regardless of
> CONFIG_CC_OPTIMIZE_FOR_SIZE
>     
> In IP header, daddr immediately follows saddr, this wont change in the
> future. We only need to make sure our flowi4 (saddr,daddr) fields wont
> break the rule.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Hmmm, this triggers a strange new build warning:

net/dccp/ipv4.c: In function ‘dccp_v4_route_skb’:
net/dccp/ipv4.c:481:3: warning: initialized field with side-effects overwritten [enabled by default]
net/dccp/ipv4.c:481:3: warning: (near initialization for ‘fl4’) [enabled by default]