linux-kernel - Re: [patch 2/4] Add ARCH_SUPPORTS

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Date:	Wed, 14 Nov 2007 16:35:58 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 2/4] Add ARCH_SUPPORTS_OPROFILE

* Sam Ravnborg (sam@...nborg.org) wrote:
> Hi Mathieu.
> 
> > 
> > It would be much better to do
> > 
> >         depends on ARCH_SUPPORTS_KPROBES
> > 
> > in that generic file, and then architectures that do support it would just
> > have a
> > 
> >         bool ARCH_SUPPORTS_KPROBES
> >                 default y
> 
> The above suggestion is actually not exactly the best way to do it...
> First the naming..
> A quick grep shows following usage today (in Kconfig files)
> ARCH_HAS	51
> ARCH_SUPPORTS	4
> HAVE_ARCH	7
> 
> ARCH_HAS is the clear winner.
> 
> 
> In the common Kconfig file do:
> 
> config FOO
> 	depends on ARCH_HAS_FOO
> 	bool "bla bla" 
> 
> config ARCH_HAS_FOO
> 	def_bool n
> 
> 
> In the arch specific Kconfig file in a suitable place do:
> 
> config SUITABLE_OPTION

Since config KPROBES will already be used in the architecture
independent Kconfig, I should find a different name for "config
SUITABLE_OPTION". Would

config KPROBES_SUPPORT
  select ARCH_HAS_KPROBES

be ok ?

> 	select ARCH_HAS_FOO
> 
> 
> The naming of ARCH_HAS_ is fixed and shall be:
> ARCH_HAS_<config option it will enable>
> 
> 
> Only a single line added pr. architecture.
> And we will end up with a (maybe even commented) list of trivial selects.
> 
> Sorry for providing late feedback on this!
> 
> 	Sam

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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