linux-kernel - Re: [Bug 14658] Regression in efi.c

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Date:	Sun, 22 Nov 2009 18:49:53 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
cc:	LKML <linux-kernel@...r.kernel.org>, indexer@...ernode.on.net,
	Feng Tang <feng.tang@...el.com>,
	bugzilla-daemon@...zilla.kernel.org
Subject: Re: [Bug 14658] Regression in efi.c

On Sat, 21 Nov 2009, bugzilla-daemon@...zilla.kernel.org wrote:

Switched to email. Please reply by mail (reply-to-all) and not in the
bugzilla.

> --- Comment #1 from Rafael J. Wysocki <rjw@...k.pl>  2009-11-21 20:17:21 ---
> Caused by:
> 
> commit 7bd867dfb4e0357e06a3211ab2bd0e714110def3

That's completely bogus. That commit is not in 2.6.31. It was merged in the
2.6.32 merge window.

>From the original bug report:

http://marc.info/?l=linux-kernel&m=125846988820120&w=4

> I would like to report a possible regression in efi.c with kernels
> 2.6.31 , 2.6.32-rc5 and 2.6.32.rc7.
>
> Attempting to boot x86_64 with elilo succeeds using 2.6.30 . Using the
> same config cannot boot with any of the 3 afore mentioned kernels.

So the problem exists with 2.6.31 already which excludes the above
commit.

The above commit indeed caused problems on 64bit efi systems in
2.6.32-rc. The fix was merged between 32-rc5 and 32-rc6.

The bisect was done with:

git bisect start
# good: [59a3759d0fe8d969888c741bb33f4946e4d3750d] Linux 2.6.30-rc7
git bisect good 59a3759d0fe8d969888c741bb33f4946e4d3750d
# bad: [156171c71a0dc4bce12b4408bb1591f8fe32dc1a] Linux 2.6.32-rc7

while the bisect should have be done with

good 2.6.30
bad  2.6.31

William, could you please go through the bisect pain again?

Thanks,

	tglx
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