linux-kernel - Re: [PATCH] avoid ifdefs in desc.h, getting rid of pack_ldt and pack

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Date:	Thu, 13 Dec 2007 22:35:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Glauber de Oliveira Costa <gcosta@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	glommer@...il.com, tglx@...utronix.de, ehabkost@...hat.com,
	jeremy@...p.org, avi@...ranet.com, anthony@...emonkey.ws,
	virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
	ak@...e.de, chrisw@...s-sol.org, rostedt@...dmis.org,
	zach@...are.com, roland@...hat.com
Subject: Re: [PATCH] avoid ifdefs in desc.h, getting rid of pack_ldt and
	pack_tss


* H. Peter Anvin <hpa@...or.com> wrote:

> Ingo Molnar wrote:
>>
>>> could we _please_ use basic tools as vmlinux size comparison and 
>>> objcompare when unifying, to make sure it's a 100% identity conversion?
>>
>> case in point, the patch claims:
>>
>>>> No functional change is made.
>>
>> but vmlinux before/after size comparison shows:
>>
>>     text    data     bss     dec     hex filename
>>  8802894 1224910 3526656 13554460         ced31c vmlinux.before
>>  8803042 1224910 3526656 13554608         ced3b0 vmlinux.after
>
> Well, "no functional changes" is not quite the same thing as "no 
> object code changes".

yeah, true, but the safest way to ensure no functional changes is to get 
identical object code. In sched-devel.git i include obj comparisons to 
cleanup patches as a self-assurance (and later bughunt helper) to make 
sure a cleanup is really just a cleanup.

also, this patch, at first sight, should result in very similar (perhaps 
even the very same) object code. Not 1.2K larger.

	Ingo
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