netdev - Re: [PATCHv5 2/2] memory barrier: adding smp_mb__after

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Date:	Tue, 07 Jul 2009 17:50:15 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fbl@...hat.com, nhorman@...hat.com,
	davem@...hat.com, htejun@...il.com, jarkao2@...il.com,
	davidel@...ilserver.org
Subject: Re: [PATCHv5 2/2] memory barrier: adding smp_mb__after_lock

On Tue, 2009-07-07 at 17:44 +0200, Oleg Nesterov wrote:
> On 07/07, Mathieu Desnoyers wrote:
> >
> > Actually, thinking about it more, to appropriately support x86, as well
> > as powerpc, arm and mips, we would need something like:
> >
> > read_lock_smp_mb()
> >
> > Which would be a read_lock with an included memory barrier.
> 
> Then we need read_lock_irq_smp_mb, read_lock_irqsave__smp_mb, write_lock_xxx,
> otherwise it is not clear why only read_lock() has _smp_mb() version.
> 
> The same for spin_lock_xxx...

At which time the smp_mb__{before,after}_{un,}lock become attractive
again.

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