linux-kernel - Re: [Kgdb-bugreport] 2.6.23-rc3-mm1: kgdb build failure on powerpc

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Message-ID: <46D604BF.7090905@bluelane.com>
Date:	Wed, 29 Aug 2007 16:43:59 -0700
From:	Pete/Piet Delaney <pete@...elane.com>
To:	Jason Wessel <jason.wessel@...driver.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	kgdb-bugreport@...ts.sourceforge.net, amitkale@...syssoft.com,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [Kgdb-bugreport] 2.6.23-rc3-mm1: kgdb build failure on powerpc

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Jason Wessel wrote:
> Andrew Morton wrote:
>> On Wed, 22 Aug 2007 17:44:12 -0500
>> Jason Wessel <jason.wessel@...driver.com> wrote:
>>
>>  
>>> +    while (!atomic_read(&debugger_active));
>>>     
>>
>> eek.  We're in the process of hunting down and eliminating exactly this
>> construct.  There have been cases where the compiler cached the
>> atomic_read() result in a register, turning the above into an infinite
>> loop.
>>
>> Plus we should never add power-burners like that into the kernel
>> anyway. That loop should have a cpu_relax() in it.  Which will also
>> fix the
>> compiler problem described above.
>>
>>   
> Agreed, and fixed with a cpu_relax.
> 
>> Thirdly, please always add a newline when coding statements like that:
>>
>>     while (expr())
>>         ;
>>   
> 
> The other instances I found of the same problem in the kgdb core are
> fixed too.
> 
> I merged all the changes into the for_mm branch in the kgdb git tree.

Where is the kgdb git tree?

- -piet

> 
> Thanks,
> Jason.
> -
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