linux-kernel - Re: [patch 3/5] Add samples subdir

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Message-Id: <20070925133234.cdd9edf1.randy.dunlap@oracle.com>
Date:	Tue, 25 Sep 2007 13:32:34 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [patch 3/5] Add samples subdir

On Tue, 25 Sep 2007 21:00:36 +0200 Sam Ravnborg wrote:

Hi Sam,

Thanks for looking.  I was hoping that you would find time to
look/comment on it.

> Hi Mathieu & Randy.
> 
> On Tue, Sep 25, 2007 at 08:11:48AM -0400, Mathieu Desnoyers wrote:
> > From: Randy Dunlap <randy.dunlap@...cle.com>
> > 
> > Begin infrastructure for kernel code samples in the samples/ directory.
> > Add its Kconfig and Kbuild files.
> > Source its Kconfig file in all arch/ Kconfigs.
> 
> Sorry for not commenting on this before...
> The samples directory contains sample code so it is wrong to actually
> include it as part of the kernel IMHO.
> We only want to keep the samples buildable and to do so
> we can make a much simpler hack in the top-level Makefile.
> Consider following patch:
> 
> @@ -760,6 +760,9 @@ vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) $(kallsyms.o) vmlinux.o
>  ifdef CONFIG_HEADERS_CHECK
>         $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
>  endif
> +ifdef CONFIG_SAMPLES
> +       $(Q)$(MAKE) $(build)=samples
> +endif
>         $(call vmlinux-modpost)
>         $(call if_changed_rule,vmlinux__)
>         $(Q)rm -f .old_version
> 
> 
> With this we build the samples when CONFIG_SAMPLES are selected and
> when the kernel is about to be linked.
> 
> 
> As for the Kconfig file I am in favour of it but think a much more
> natural place is to source it in lib/Kconfig.debug.
> Then it will appear in "Kernel hacking" and the smaples
> are used for kernel hacking and not for regular people
> building their own kernel.
> 
> Sourcing samples/Kconfig from lib/Kconfig.debug will then
> take effect for all archs so the result is a much simpler
> Kconfig patch too.

These changes all sound good to me.

Mathieu, can you find time to do this or should I do it?

---
~Randy
Phaedrus says that Quality is about caring.
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