linux-kernel - Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP

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Message-ID: <4B4BAF2B.5020406@zytor.com>
Date:	Mon, 11 Jan 2010 15:07:23 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Yinghai Lu <yinghai@...nel.org>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch] x86, apic: use 0x20 for the IRQ_MOVE_CLEANUP_VECTOR instead
 of 0x1f

On 01/11/2010 03:00 PM, Eric W. Biederman wrote:
>>
>> In irqinit.c, we statically pre-assign the per-cpu vector to irq
>> mappings (vector_irq) for all the legacy IRQ vectors. Similarly irq_cfg
>> is statically initialized for legacy IRQ's in io_apic.c. So we won't be
>> able to use this space for anything else.
> 
> Last I looked when we switched legacy irqs irqs from pic mode to io_apic mode
> we continue to use the same vector.
> 
> Which means we should not be wasting those vectors and that it is dangerous
> to play lowest priority irq games in that range.
> 

This statement made no sense to me?

	-hpa

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