linux-kernel - Re: [SNMP]: Fix SNMP counters with PREEMPT

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Message-Id: <20071220.041339.197739349.davem@davemloft.net>
Date:	Thu, 20 Dec 2007 04:13:39 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	dada1@...mosbay.com, kuznet@....inr.ac.ru, wangchen@...fujitsu.com,
	gerrit@....abdn.ac.uk, andi@...stfloor.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, clameter@....com, mingo@...e.hu
Subject: Re: [SNMP]: Fix SNMP counters with PREEMPT

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Sun, 16 Dec 2007 10:30:25 +0800

> On Sat, Dec 15, 2007 at 06:03:19PM +0100, Eric Dumazet wrote:
> >
> > How come you change SNMP_INC_STATS_USER() but not SNMP_INC_STATS() ?
> 
> Heh, my brain must have blocked me from seeing it because it's
> too hard :)
> 
> Let's fix it the stupid way first and I'll do a local_t conversion
> later.
> 
> [SNMP]: Fix SNMP counters with PREEMPT
> 
> The SNMP macros use raw_smp_processor_id() in process context
> which is illegal because the process may be preempted and then
> migrated to another CPU.
> 
> This patch makes it use get_cpu/put_cpu to disable preemption.
> 
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

I just noticed this and replaced the other SNMP fix patch
with this one.
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