linux-kernel - Re: [PATCH] x86: Use is_kprobe

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Message-Id: <1199329200.6323.97.camel@brick>
Date:	Wed, 02 Jan 2008 19:00:00 -0800
From:	Harvey Harrison <harvey.harrison@...il.com>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, qbarnes <qbarnes@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>, davem@...emloft.net,
	Keshavamurthy Anil S <anil.s.keshavamurthy@...el.com>
Subject: Re: [PATCH] x86: Use is_kprobe_fault to better match usage

On Wed, 2008-01-02 at 21:36 -0500, Masami Hiramatsu wrote:
> Hi Harvey,
> 
> Harvey Harrison wrote:
> > Currently the notify_page_fault helper is used to test it the page
> > fault was caused by a kprobe causing an early return from do_page_fault.
> > 
> > Change the name of the helper to is_kprobe_fault to match the usage and
> > remove the preempt_disable/enable pair around kprobe_running() with an
> > explicit test for preemption.  The idea for this comes from a patch
> > by Quentin Barnes to kprobes.c
> 
> Sure, that's right.
> However, since other architectures also have notify_page_fault(),
> I think all of those code might better be changed same time for
> maintainability.
> 

How about a static inline in linux/kprobes.h with a big comment above
about when/why the !preemptible() check is sufficient?

Harvey



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