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Date:	Wed, 28 Oct 2009 12:37:00 +0100
From:	Claudio Scordino <claudio@...dence.eu.com>
To:	Catalin Marinas <catalin.marinas@....com>
CC:	linux-kernel@...r.kernel.org, rmk+kernel@....linux.org.uk,
	linux-arm-kernel@...ts.arm.linux.org.uk, akpm@...ux-foundation.org
Subject: Re: [PATCH][RE-SUBMIT] Default setting of the ARM_UNWIND option

Catalin Marinas ha scritto:
> On Mon, 2009-10-26 at 09:27 +0100, Claudio Scordino wrote:
>   
>> My ARM board hanged at the initial "Calibrating delay loop" message.
>>
>> After some inspection, I found out the problem to be with commit
>> adf8b37bafc1495393201a2ae4235846371870d0. This commit introduces stack
>> unwinding for ARM, and set it enabled by default. However, it seems to
>> not work with buggy or not-EABI compilers.
>>
>> My suggestion is to keep the feature (which is fine) but change the
>> default setting of the option (see the attached patch).
>>     
>
> The option still depends on EXPERIMENTAL, so you get ARM_UNWIND on when
> enabling that.
>
> I'm more in favour of a #warning on #error in the unwind.c file based on
> the compiler version rather than not having it on by default. The reason
> is that people reported performance improvements when compiling the
> kernel without frame pointers.
>   
This solution is fine too (even if I still think that changing the 
default setting is better).

Please, consider the patch in attachment: is it like you would have it ?

BTW, do we have any list of buggy or not-EABI versions of the gcc compiler ?

Many thanks,

            Claudio


View attachment "0001-Disable-stack-unwinding-support-by-default-since-it.patch" of type "text/x-patch" (1210 bytes)

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