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Date:	Thu, 19 Jun 2008 18:43:35 +0300
From:	Adrian Bunk <>
To:	Arjan van de Ven <>
Cc:	Dave Airlie <>,
	Linux Kernel Mailing List <>,
	Linus Torvalds <>,,
	Andrew Morton <>
Subject: Re: 2.6.26-rc possible regression in ext3

On Thu, Jun 19, 2008 at 08:27:48AM -0700, Arjan van de Ven wrote:
> Adrian Bunk wrote:
>> On Thu, Jun 19, 2008 at 08:18:39AM -0700, Arjan van de Ven wrote:
>>> Adrian Bunk wrote:
>>>> On Thu, Jun 19, 2008 at 06:40:05AM -0700, Arjan van de Ven wrote:
>>>>> Adrian Bunk wrote:
>>>>>> Expect a lot more of this to pop up in the future.
>>>>>> Should we #error for gcc 4.3.1?
>>>>> it/s better to find if the gcc guys made a testcase for this bug (they normally do) and
>>>>> test based on that.
>>>> The gcc Bugzilla contains a testcase.
>>>> But how do you plan to integrate it into a kernel build?
>>> we already have several of these.
>>> Just look at scripts/ for an example of such a beast.
>> Checking whether gcc supports some flags is easy.
> have you actually looked at this script?
> You didn't, since the script doesn't check if gcc supports some flag.
> It checks very specifically for a code generation pattern...
> Please go look at the script first before responding.

I did look, but I missed the last pipe...

Do we know for sure this bug can only trigger on 32bit x86?

Or is there anything else I miss in 
that allows to use this approach to check for wrong code generation 
caused by platform independent gcc bugs?



       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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