linux-kernel - Re: [PATCH] [1/28] x86: Fix panic with interrupts off (needed for MCE)

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Date:	Mon, 20 Apr 2009 09:26:56 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: [PATCH] [1/28] x86: Fix panic with interrupts off (needed for
 MCE)

Andi Kleen wrote:
> I put the reboot vector into the highest priority bucket
> of the APIC vectors and moved the 64bit UV_BAU message
> down instead into the next lower priority.

I had forgotten to point this...

> @@ -88,12 +88,14 @@
>  #define THERMAL_APIC_VECTOR		0xfa
>  
>  #ifdef CONFIG_X86_32
> -/* 0xf8 - 0xf9 : free */
> +/* 0xf9 : free */
>  #else
>  # define THRESHOLD_APIC_VECTOR		0xf9
> -# define UV_BAU_MESSAGE			0xf8
>  #endif
>  
> +#define REBOOT_VECTOR			0xf8
> +
> +
>  /* f0-f7 used for spreading out TLB flushes: */
>  #define INVALIDATE_TLB_VECTOR_END	0xf7
>  #define INVALIDATE_TLB_VECTOR_START	0xf0
> @@ -116,6 +118,8 @@
>   */
>  #define GENERIC_INTERRUPT_VECTOR	0xed
>  
> +#define UV_BAU_MESSAGE			0xec
> +
>  /*
>   * First APIC vector available to drivers: (vectors 0x30-0xee) we
>   * start at 0x31(0x41) to spread out vectors evenly between priority

Does this change (=pulling down the priority of UV_BAU_VECTOR) not impact
users of the UV_BAU_MESSAGE?

I can see why REBOOT_VECTOR need to be highest priority.
Maybe you could pull down THERMAL_APIC_VECTOR/THRESHOLD_APIC_VECTOR
instead.  Why you choose UV_BAU_MESSAGE?


Thanks,
H.Seto

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