linux-kernel - Re: [PATCH 2/7] linker script: throw away .discard section

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Date:	Wed, 20 May 2009 17:18:41 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Mike Frysinger <vapier.adi@...il.com>
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org, x86@...nel.org,
	ink@...assic.park.msu.ru, rth@...ddle.net, linux@....linux.org.uk,
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	takata@...ux-m32r.org, geert@...ux-m68k.org, monstr@...str.eu,
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	davem@...emloft.net, jdike@...toit.com, chris@...kel.net,
	rusty@...tcorp.com.au
Subject: Re: [PATCH 2/7] linker script: throw away .discard section

Tejun Heo wrote:
> Mike Frysinger wrote:
>> On Wed, May 20, 2009 at 03:37, Tejun Heo wrote:
>>> x86 throws away .discard section but no other archs do.  Also,
>>> .discard is not thrown away while linking modules.  Make every arch
>>> and module linking throw it away.  This will be used to define dummy
>>> variables for percpu declarations and definitions.
>> seems like a good time to introduce a common DISCARD define to
>> include/asm-generic/vmlinux.lds.h.  considering multiple /DISCARD/
>> entries are allowed in a linker script, the define should be pretty
>> straightforward:
>> #define DISCARDS \
>>     /DISCARD/ : { \
>>         EXIT_TEXT \
>>         EXIT_DATA \
>>         *(.exitcall.exit) \
>>         *(.discard) \
>>     }
> 
> Hmmm... indeed, that would be nice.  I'll update the patch.

Eh... handling of EXIT_TEXT and DATA aren't uniform across archs.  I
think I'll leave the /DISCARD/ unification for the next time.

Thanks.

-- 
tejun
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