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Date: Wed, 24 Jul 2002 07:07:34 +0400
From: Oleg Nesterov <oleg@tv-sign.ru>
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To: Ingo Molnar <mingo@elte.hu>
CC: linux-kernel@vger.kernel.org, Linus Torvalds <torvalds@transmeta.com>
Subject: Re: [patch] big IRQ lock removal, 2.5.27-G0
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Hello.

> > Then local_bh_enable() has a small preemptible window between
> > __local_bh_enable() and do_softirq()->local_irq_save(flags).
> > It is only latency problem.
> 
> i dont think getting a preemption before softirqs are processed is a big
> problem. Such type of preemption comes in form of an interrupt, which
> handles softirqs in irq_exit() anyway, so there's no delay.

Well, no. Not all smp_xxx_interrupt() use irq_enter/exit().
Reschedule interrupt, for example, do not. But indeed, it is not
big problem.

Oleg.
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