linux-kernel - Re: Linux 2.6.38-rc1 doesn't boot

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Message-ID: <4D36A759.60704@intel.com>
Date:	Wed, 19 Jan 2011 00:56:57 -0800
From:	"H. Peter Anvin" <h.peter.anvin@...el.com>
To:	Shaohua Li <shaohua.li@...el.com>
CC:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	"Lu, Hongjiu" <hongjiu.lu@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Sam Ravnborg <sam@...nborg.org>
Subject: Re: Linux 2.6.38-rc1 doesn't boot

On 01/19/2011 12:12 AM, Shaohua Li wrote:
> On Wed, 2011-01-19 at 15:49 +0800, Markus Trippelsdorf wrote:
>> On 2011.01.19 at 08:39 +0100, Markus Trippelsdorf wrote:
>>> On 2011.01.18 at 15:54 -0800, Linus Torvalds wrote:
>>>>
>>>> And as usual, report any regressions to the lists and the appropriate
>>>> authorities.
>>>
>>> Unfortunately 2.6.38-rc1 doesn't even boot on my machine (amd64).
>>> This is caused by 86b1e8dd83cbb0f:
>>>     x86: Make relocatable kernel work with new binutils
>>>
>>> Reverting the commit solves the problem.
>>
>> I'm running the latest binutils:
>> GNU ld (Linux/GNU Binutils) 2.21.51.0.5.20110104
> Hmm, reproduce it here with binutils-2.21.51.0.6-20110118
> but not with GNU ld (GNU Binutils for Ubuntu) 2.20.51-system.20100908
> I got this in system.map: ffffffff03514880 D jiffies_64, which looks
> wrong.
> looks binutils changed something again.
> Have no idea, CC Lu Hongjiu.
> 

Either way... the whole jiffies vs jiffies_64 thing is kind of
ridiculous.  We should be able to do it in a completely
architecture-generic way by either making it a union(!) (with "jiffies"
and "jiffies_64" presumably would be #defines, or we do a global replace
across the tree), moving the variable declaration itself to a .S file
(which would only have data components and therefore would be
arch-generic) or doing something like the attached (untested since it is
1 am here) patch.

This should let us get rid of the hacks in *all* the architectures, not
just x86.

	-hpa

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