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

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Date:	Mon, 10 Dec 2007 13:00:26 +0100
From:	Sam Ravnborg <sam@...nborg.org>
To:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
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

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


	Sam
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