linux-kernel - Re: [PATCH -tip] x86: do_IRQ - send EOI for x86-32 on irq without handler

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Date:	Wed, 8 Apr 2009 15:25:58 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>
Subject: Re: [PATCH -tip] x86: do_IRQ - send EOI for x86-32 on irq without
	handler


* Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Cyrill Gorcunov <gorcunov@...nvz.org> wrote:
> 
> > For X86-32 if IRQ has no handler it remains non-Ack'ed
> > even if APIC is not requested for being disabled.
> > Fix it.
> 
> nice fix. Did you observe any real hangs in such a situation, or is 
> this via code review?

more stuff needs fixing here first:

arch/x86/kernel/irq.c: In function ‘do_IRQ’:
arch/x86/kernel/irq.c:226: error: ‘disable_apic’ undeclared (first use in this function)
arch/x86/kernel/irq.c:226: error: (Each undeclared identifier is reported only once
arch/x86/kernel/irq.c:226: error: for each function it appears in.)

like making 'disable_apic' available everywhere.

Or better yet: introduce a dummy apic->write() method in the 
disable_apic=1 case so we can call a straight ack_APIC_irq().

	Ingo
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