netdev - Re: [PATCH net-next] ipv4: tcp: remove per net tcp

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Date:	Thu, 19 Jul 2012 19:07:47 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, therbert@...gle.com, wsommerfeld@...gle.com
Subject: Re: [PATCH net-next] ipv4: tcp: remove per net tcp_sock

On Thu, 2012-07-19 at 08:45 -0700, David Miller wrote:
> From: David Miller <davem@...emloft.net>
> Date: Thu, 19 Jul 2012 08:35:44 -0700 (PDT)
> 
> > Looks great, applied, thanks Eric.
> 
> I take that back, it doesn't build:
> 
> net/ipv4/ip_output.c: In function ‘ip_send_unicast_reply’:
> net/ipv4/ip_output.c:1481:1: error: section attribute cannot be specified for local variables
> net/ipv4/ip_output.c:1481:1: error: section attribute cannot be specified for local variables
> net/ipv4/ip_output.c:1481:1: error: declaration of ‘__pcpu_unique_unicast_sock’ with no linkage follows extern declaration
> net/ipv4/ip_output.c:1481:1: note: previous declaration of ‘__pcpu_unique_unicast_sock’ was here
> net/ipv4/ip_output.c:1481:9: error: section attribute cannot be specified for local variables
> net/ipv4/ip_output.c:1481:9: error: weak declaration of ‘unicast_sock’ must be public

Strange, it builds on my machines, and I got nice performance boost.

Apparently your arch doesnt handle the 

static DEFINE_PER_CPU(struct inet_sock, unicast_sock)

in the function body ?


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