linux-kernel - Re: [PATCH] pop previous section in alternative.c

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Message-ID: <47FE53E2.5070204@zytor.com>
Date:	Thu, 10 Apr 2008 10:52:34 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Steven Rostedt <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andy Whitcroft <apw@...dowen.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	akpm@...ux-foundation.org, Rusty Russell <rusty@...tcorp.com.au>,
	Glauber de Oliveira Costa <gcosta@...hat.com>,
	Jan Beulich <jbeulich@...ell.com>,
	Thomas Gleixner <tglx@...utronix.de>, pinskia@....gnu.org
Subject: Re: [PATCH] pop previous section in alternative.c

Linus Torvalds wrote:
> 
> Obviously, it would have been really nice if something like the assembler 
> had caught it with some simple sanity-test (ie I think the .size thing 
> would be a good sanity check _regardless_), so in that sense it's our bug 
> that might have been avoided with soem sanity testing, but on the other 
> hand, I can well understand that gas didn't do it - since it would matter 
> only for totally buggy code that was never emitted by the compiler.
> 

Agreed.

> Gas historically used to not do any sanity-checking what-so-ever, and was 
> very much meant to be just for compiler output (which is why #APP exists 
> in the first place - to mark places that aren't pure compiler input). It's 
> actually improved immensely in that area and now is useful as a 
> traditional human-usable assembler with lots of support like macros etc.

Indeed it has.

	-hpa

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