linux-kernel - Re: [PATCH v3] ARM: Use generic BUG() handler

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Date:	Thu, 7 Apr 2011 09:49:33 -0700
From:	Simon Glass <sjg@...omium.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Joe Perches <joe@...ches.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Alexander Shishkin <virtuoso@...nd.org>,
	Phil Carmody <ext-phil.2.carmody@...ia.com>,
	Rabin Vincent <rabin@....in>, linux-kernel@...r.kernel.org,
	Omar Ramirez Luna <omar.ramirez@...com>,
	Dave Martin <dave.martin@...aro.org>
Subject: Re: [PATCH v3] ARM: Use generic BUG() handler

On Wed, Apr 6, 2011 at 10:35 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> On 4/6/2011 4:18 PM, Simon Glass wrote:
>> v3: Remove old BUG() implementation in favor of this one.
>> Remove the Backtrace: message (will submit this separately).
>> Use ARM_EXIT_KEEP() so that some architectures can dump exit text at link time
>> thanks to Stephen Boyd <sboyd@...eaurora.org> (although since we always
>> define GENERIC_BUG this might be academic.)
>
> Its not entirely academic because CONFIG_BUG=n and CONFIG_SMP_ON_UP=n
> would allow us to remove the exit text. This could be huge for people
> who want to cram kernel's onto space constrained devices.

OK I see. On my kernel this is 8KB but every little helps and no point
it having it in there if it isn't needed.

>> Rebase to linux-2.6.git master.
>>
>> Change-Id: I07d77c832e816f5ad2390e25f466ddf750adecf4
>
> Don't forget to remove these before submitting to the patch tracker (and
> sending to the list).

OK thanks.

>> diff --git a/arch/arm/include/asm/bug.h b/arch/arm/include/asm/bug.h
>> index 4d88425..2914724 100644
>> --- a/arch/arm/include/asm/bug.h
>> +++ b/arch/arm/include/asm/bug.h
>> @@ -3,21 +3,58 @@
>>
>>
>>  #ifdef CONFIG_BUG
>> -#ifdef CONFIG_DEBUG_BUGVERBOSE
>> -extern void __bug(const char *file, int line) __attribute__((noreturn));
>> -
>> -/* give file/line information */
>> -#define BUG()                __bug(__FILE__, __LINE__)
>
> Does anybody reference __bug() anymore? If not you can remove that too.

No one is using it now, I will do this.

Regards,
Simon
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