linux-kernel - Re: [PATCH 2/2] Kprobes: Build kretprobe samples only if arch supports kretprobes

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Date:	Mon, 10 Dec 2007 19:12:14 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	akpm@...ux-foundation.org, lkml <linux-kernel@...r.kernel.org>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	davem@...emloft.net, mathieu.desnoyers@...ymtl.ca,
	hskinnemoen@...el.com
Subject: Re: [PATCH 2/2] Kprobes: Build kretprobe samples only if arch supports kretprobes - updated

On Mon, Dec 10, 2007 at 01:00:26PM +0100, Sam Ravnborg wrote:
> On Mon, Dec 10, 2007 at 03:23:50PM +0530, Ananth N Mavinakayanahalli wrote:
> > From: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> > 
> > This patch builds samples/kprobes/kretprobe_example.c only on archs that
> > support kretprobes.
> > 
> > 
> > Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
> > ---
> >  samples/kprobes/Makefile |    7 +++++--
> >  1 files changed, 5 insertions(+), 2 deletions(-)
> > 
> > Index: linux-2.6.24-rc4/samples/kprobes/Makefile
> > ===================================================================
> > --- linux-2.6.24-rc4.orig/samples/kprobes/Makefile
> > +++ linux-2.6.24-rc4/samples/kprobes/Makefile
> > @@ -1,5 +1,8 @@
> >  # builds the kprobes example kernel modules;
> >  # then to use one (as root):  insmod <module_name.ko>
> >  
> > -obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o jprobe_example.o \
> > -		kretprobe_example.o
> > +obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o jprobe_example.o
> > +
> > +ifeq ($(CONFIG_HAVE_KRETPROBES),y)
> > +obj-$(CONFIG_SAMPLE_KPROBES) += kretprobe_example.o
> > +endif
> 
> It would be nice to push this configuration dependency to Kconfig.
> Something like:
> 
> config SAMPLE_KRETPROBES
> 	default y
> 	depends on SAMPLE_KPROBES
> 
> And then in the Makefile have:
> obj-$(CONFIG_SAMPLE_KRETPROBES) += kretprobe_example.o

Done. Updated patch below...

From: Ananth N Mavinakayanahalli <ananth@...ibm.com>

This patch builds samples/kprobes/kretprobe_example.c only on archs that
support kretprobes. Thanks to Sam Ravnborg for Kconfig suggestions.


Signed-off-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>
---
 samples/Kconfig          |    5 +++++
 samples/kprobes/Makefile |    4 ++--
 2 files changed, 7 insertions(+), 2 deletions(-)

Index: linux-2.6.24-rc4/samples/kprobes/Makefile
===================================================================
--- linux-2.6.24-rc4.orig/samples/kprobes/Makefile
+++ linux-2.6.24-rc4/samples/kprobes/Makefile
@@ -1,5 +1,5 @@
 # builds the kprobes example kernel modules;
 # then to use one (as root):  insmod <module_name.ko>
 
-obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o jprobe_example.o \
-		kretprobe_example.o
+obj-$(CONFIG_SAMPLE_KPROBES) += kprobe_example.o jprobe_example.o
+obj-$(CONFIG_SAMPLE_KRETPROBES) += kretprobe_example.o
Index: linux-2.6.24-rc4/samples/Kconfig
===================================================================
--- linux-2.6.24-rc4.orig/samples/Kconfig
+++ linux-2.6.24-rc4/samples/Kconfig
@@ -28,5 +28,10 @@ config SAMPLE_KPROBES
 	help
 	  This build several kprobes example modules.
 
+config SAMPLE_KRETPROBES
+	tristate "Build kretprobes example -- loadable modules only"
+	default m
+	depends on SAMPLE_KPROBES && HAVE_KRETPROBES
+
 endif # SAMPLES
 
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