linux-kernel - Re: [PATCH] x86: kprobes remove fix

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Message-ID: <20071230132337.GF16946@elte.hu>
Date:	Sun, 30 Dec 2007 14:23:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86: kprobes remove fix_riprel #ifdef


* Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Hello Harvey,
> 
> A similar idea was already nack-ed by Ananth.
> http://sources.redhat.com/ml/systemtap/2007-q4/msg00468.html
> And I agree his thought.
> 
> Especially, "riprel" does not exist on x86_32, so fix_riprel()
> is meaningless on it.
> Thus, I think it would better be ifdef'd in call-site.

but we regularly do this in generic code: we add calls that are NOPs on 
some architectures. For example flush_cache_page() makes no sense on the 
x86 architecture. So i'm inclined to apply Harvey's cleanup - less
#ifdef complexity in higher-level code is very much favored, even
if "riprel" is a NOP concept on 32-bit.

	Ingo
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