linux-kernel - Re: [patch 00/23] x86: Cleanup apic/ioapic/x2apic setup code

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Date:	Wed, 21 Jan 2015 10:33:19 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Jiang Liu <jiang.liu@...ux.intel.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Joerg Roedel <joro@...tes.org>, x86@...nel.org,
	Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>
Subject: Re: [patch 00/23] x86: Cleanup apic/ioapic/x2apic setup code

On Wed, 21 Jan 2015, Jiang Liu wrote:
> On 2015/1/16 19:05, Thomas Gleixner wrote:
> Hi Thomas,
> 	With above patch applied, it just gives a blank screen
> instead of a panic when booting on my problematic laptop.
> Now I have found the root cause of the failure on my laptop.
> 	On i386, it triggers  BUG_ON(!apic->apic_id_registered())
> in function setup_local_APIC() because apic_bsp_up_setup() is called
> too late. So we need a simple patch as below. With following patch
> applied, it boots successfully with your original patch.

Duh. Right you are. I wonder why this boots on any other
machine. Seems there is some more magic in this setup maze.

Thanks,

	tglx
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