netdev - Re: Kernel crash after using new Intel NIC (igb)

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Message-ID: <20110528180434.GB12530@elte.hu>
Date:	Sat, 28 May 2011 20:04:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Arun Sharma <asharma@...com>, David Miller <davem@...emloft.net>,
	Maximilian Engelhardt <maxi@...monizer.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	StuStaNet Vorstand <vorstand@...sta.mhn.de>,
	Yann Dupont <Yann.Dupont@...v-nantes.fr>,
	Denys Fedoryshchenko <denys@...p.net.lb>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Kernel crash after using new Intel NIC (igb)


* Eric Dumazet <eric.dumazet@...il.com> wrote:

> > +static inline int atomic_add_unless(atomic_t *v, int a, int u)
> > +{
> > +	return __atomic_add_unless(v, a, u) != u;
> >  }
> >  
> >  #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
> 
> As I said, atomic_add_unless() has several implementations in 
> various arches. You must take care of all, not only x86.

It's a bit sad to see local hacks to generic facilities committed 
upstream like that.

Arun: the x86 bits look good at first sight.

Thanks,

	Ingo
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