netdev - Re: [PATCH 09/16] netvm: Allow skb allocation to use PFMEMALLOC reserves

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Message-ID: <20120627083246.GF8271@suse.de>
Date:	Wed, 27 Jun 2012 09:32:46 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Miller <davem@...emloft.net>, Neil Brown <neilb@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Christie <michaelc@...wisc.edu>,
	Eric B Munson <emunson@...bm.net>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH 09/16] netvm: Allow skb allocation to use PFMEMALLOC
 reserves

On Tue, Jun 26, 2012 at 05:27:34PM +0200, Sebastian Andrzej Siewior wrote:
> On Fri, Jun 22, 2012 at 03:30:36PM +0100, Mel Gorman wrote:
> > diff --git a/net/core/sock.c b/net/core/sock.c
> > index 5c9ca2b..159dccc 100644
> > --- a/net/core/sock.c
> > +++ b/net/core/sock.c
> > @@ -271,6 +271,9 @@ __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
> >  int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
> >  EXPORT_SYMBOL(sysctl_optmem_max);
> >  
> > +struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE;
> > +EXPORT_SYMBOL_GPL(memalloc_socks);
> > +
> 
> This is used via sk_memalloc_socks() by SLAB.
> 
> From 3da9ab9972845974da114c5a6624335e6371b2d5 Mon Sep 17 00:00:00 2001
> From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
> Date: Tue, 26 Jun 2012 17:18:20 +0200
> Subject: [PATCH] export sk_memalloc_socks() only with CONFIG_NET
> 
> |mm/built-in.o: In function `atomic_read':
> |include/asm/atomic.h:25: undefined reference to `memalloc_socks'
> |include/asm/atomic.h:25: undefined reference to `memalloc_socks'
> |include/asm/atomic.h:25: undefined reference to `memalloc_socks'
> |include/asm/atomic.h:25: undefined reference to `memalloc_socks'
> |include/asm/atomic.h:25: undefined reference to `memalloc_socks'
> |mm/built-in.o:include/asm/atomic.h:25: more undefined references to `memalloc_socks' follow
> 
> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>

Well caught. I had not tested build with !CONFIG_NET. I've folded in
this patch and the credits accordingly. Thanks.

-- 
Mel Gorman
SUSE Labs
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