linux-kernel - Re: [PATCH] x86: add apic probe for genapic 64bit v2

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Message-ID: <20080722191708.GE14380@linux-os.sc.intel.com>
Date:	Tue, 22 Jul 2008 12:17:09 -0700
From:	Suresh Siddha <suresh.b.siddha@...el.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: add apic probe for genapic 64bit v2

On Tue, Jul 22, 2008 at 11:40:13AM -0700, Yinghai Lu wrote:
> could be apic mode is set to phys flat mode by BIOS.
> 
> get
> APIC error (0x40)...

Does this happen while sending IPI's? AP bringup should be same
irrespective of the genapic mode we select here.

> that is the reason for introducing max_phys_apicid.

We may need a workaround if it is some cpu/platform specific issue. But we
need to understand the actual issue and document it properly, so that
it doesn't break in the future.

thanks,
suresh
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