linux-kernel - Re: [PATCH 13/14] x86_64 irq: Safely cleanup an irq after moving it.

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Message-ID: <m1ps7yphf7.fsf@ebiederm.dsl.xmission.com>
Date:	Sun, 25 Feb 2007 05:09:48 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Mika Penttilä <mika.penttila@...umbus.fi>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Zwane Mwaikambo <zwane@...radead.org>,
	Ashok Raj <ashok.raj@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"Lu, Yinghai" <yinghai.lu@....com>,
	Natalie Protasevich <protasnb@...il.com>,
	Andi Kleen <ak@...e.de>,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 13/14] x86_64 irq: Safely cleanup an irq after moving it.

Mika Penttilä <mika.penttila@...umbus.fi> writes:

> Eric W. Biederman wrote:
>>   * Vectors 0x20-0x2f are used for ISA interrupts.
>>   */
>> -#define IRQ0_VECTOR		FIRST_EXTERNAL_VECTOR
>> +#define IRQ0_VECTOR		FIRST_EXTERNAL_VECTOR + 0x10
>>  #define IRQ1_VECTOR		IRQ0_VECTOR + 1
>>  #define IRQ2_VECTOR		IRQ0_VECTOR + 2
>>  #define IRQ3_VECTOR		IRQ0_VECTOR + 3
>> @@ -82,7 +87,7 @@
>>
> I think we have a dependency in i8259.c that irq0 is mapped to vector 0x20.

We did, but I'm pretty certain I removed it when I introduced the
IRQ[0-15]_VECTOR defines.

One of my test machines seems to be delivering irq0 in EXTInt mode
with this patch applied (a bug of another flavor) so I don't think
there is a real issue here.

Eric
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