linux-kernel - Re: [PATCH 1/1] x86: fix text

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Message-ID: <alpine.LFD.1.10.0804250830200.2779@woody.linux-foundation.org>
Date:	Fri, 25 Apr 2008 08:33:53 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Jiri Slaby <jirislaby@...il.com>,
	David Miller <davem@...emloft.net>, zdenek.kabelac@...il.com,
	rjw@...k.pl, paulmck@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	linux-ext4@...r.kernel.org, herbert@...dor.apana.org.au,
	penberg@...helsinki.fi, clameter@....com,
	linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Andi Kleen <andi@...stfloor.org>, pageexec@...email.hu,
	"H. Peter Anvin" <hpa@...or.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Subject: Re: [PATCH 1/1] x86: fix text_poke



On Fri, 25 Apr 2008, Ingo Molnar wrote:
> 
> something like the patch below? (untested)

No. That whole code sequence is total and utter crap. It needs to be 
rewritten.

It first does a BUG_ON() if it's not naturally aligned (because that 
wouldn't be atomic), and then it has code for page crossing! What a TOTAL 
PIECE OF SH*T!

Hint:
 - if it's naturally aligned, it couldn't be page crossing ANYWAY
 - and if it was a page-crosser, it sure as hell couldn't be atomic!

The code is just crap, crap, crap. It needs to be rewritten from scratch. 
I'll have a patch soonish.

		Linus
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