linux-kernel - Bisected regression (Was Re: current -git fails to boot on nehalem-ex)

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Date:	Thu, 10 Dec 2009 11:39:45 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, yinghai@...nel.org
Subject: Bisected regression (Was Re: current -git fails to boot on
	nehalem-ex)

On Thu, Dec 10 2009, Jens Axboe wrote:
> Hi,
> 
> As written in the subject, it just hard hangs before writing anything on
> the console. With earlyprintk, I captured the failure, see below.
> 
> I'll try and bisect this, but it takes some time (since the bios and
> post process takes forever). I just updated the firmware on the box as
> well, but it did boot 2.6.32 (and RHEL5 boots fine too). Of course that
> doesn't rule out a BIOS bug.

Results are persistent, git bisect points to:

commit b24c2a925a9837cccf54d50aeac22ba0cbc15455
Author: Yinghai Lu <yinghai@...nel.org>
Date:   Tue Nov 24 02:48:18 2009 -0800

    x86: Move find_smp_config() earlier and avoid bootmem usage

which appears consistent with the panic(). Reverting that does indeed
make current -git boot properly.

-- 
Jens Axboe

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