linux-kernel - Re: [PATCH 1/2] Kprobes: Indicate kretprobe support in arch/<arch>/Kconfig

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Date:	Tue, 11 Dec 2007 11:39:29 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Sam Ravnborg <sam@...nborg.org>, akpm@...ux-foundation.org,
	lkml <linux-kernel@...r.kernel.org>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	davem@...emloft.net, hskinnemoen@...el.com
Subject: Re: [PATCH 1/2] Kprobes: Indicate kretprobe support in arch/<arch>/Kconfig - updated

On Mon, Dec 10, 2007 at 10:10:01AM -0500, Mathieu Desnoyers wrote:
> * Ananth N Mavinakayanahalli (ananth@...ibm.com) wrote:
> > On Mon, Dec 10, 2007 at 11:13:07AM +0100, Sam Ravnborg wrote:
> > > On Mon, Dec 10, 2007 at 03:22:22PM +0530, Ananth N Mavinakayanahalli wrote:
> > > > From: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> > > > 

<snip>

> > Index: linux-2.6.24-rc4/include/linux/kprobes.h
> > ===================================================================
> > --- linux-2.6.24-rc4.orig/include/linux/kprobes.h
> > +++ linux-2.6.24-rc4/include/linux/kprobes.h
> > @@ -125,11 +125,11 @@ struct jprobe {
> >  DECLARE_PER_CPU(struct kprobe *, current_kprobe);
> >  DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
> >  
> > -#ifdef ARCH_SUPPORTS_KRETPROBES
> > +#ifdef CONFIG_HAVE_KRETPROBES
> 
> Hi Ananth,
> 
> I just want to point out a detail: if someone sets CONFIG_KPROBES to n,
> the CONFIG_HAVE_KPROBES is still y, and so is CONFIG_HAVE_KRETPROBES.
> However, I doubt that you want to activate this code in this case ?
> The code paths are OK because they are nested into CONFIG_KPROBES
> ifdefs (or not built due to dependency on CONFIG_KPROBES in the
> Makfile), but if one wants to use CONFIG_HAVE_KRETPROBE for something
> else (Makefile), then it could become a problem.
> 
> Could we add a menu entry CONFIG_KRETPROBES that depends on
> CONFIG_HAVE_KRETPROBES and CONFIG_KPROBES, and also remove the
> CONFIG_HAVE_KPROBES dependency for the CONFIG_HAVE_KRETPROBE option ?
> This way, we would have much more flexibility (like specifiying if we
> want CONFIG_KRETPROBES to be default y or default n...)

Done... Updated patch coming up.

Ananth
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