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

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Message-ID: <20071230154544.GB10444@elte.hu>
Date:	Sun, 30 Dec 2007 16:45:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Harvey Harrison <harvey.harrison@...il.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:

> Indeed.
> By the way, flush_cache_page() is defined as a do-while(0) on x86.
> Would it better to define fix_riprel() as a do-while(0) on x86-32?
> I think this obviously indicates that function has no effect.

NOPs should always be an inline. flush_cache_page()'s macro use is 
historic - feel free to send cleanup patches against cacheflush.h.

or even better, since most architectures dont need explicit 
cache-flushes, provide an asm-generic/cache_flush-nop.h file that is
#include-ed by asm-x86/cacheflush.h. (and by other architectures)

	Ingo
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