linux-kernel - Re: [PATCH 2/11] x86: convert to generic helpers for IPI function calls

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Date:	Tue, 22 Apr 2008 10:38:10 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	npiggin@...e.de, torvalds@...ux-foundation.org,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 2/11] x86: convert to generic helpers for IPI function calls

On Tue, Apr 22, 2008 at 09:57:28AM +0200, Jens Axboe wrote:
> This converts x86 and x86-64 to use the new helpers for
> smp_call_function() and friends, and adds support for
> smp_call_function_single().
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 87a693c..aab97e3 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -156,6 +156,11 @@ config GENERIC_PENDING_IRQ
>  	depends on GENERIC_HARDIRQS && SMP
>  	default y
>  
> +config GENERIC_SMP_HELPERS
> +	bool
> +	depends on SMP
> +	default y
> +

Hi Jens.

[Not x86 specific - it was the first patch
touching a Kconfig file]

Could we define a single config variable
in for example kernel/Kconfig(*)
like this:

config HAVE_GENERIC_SMP_HELPERS
	def_bool n

And then the archs that uses the generic SMP helpers just
do a simple:

 config X86
+	select HAVE_GENERIC_SMP_HELPERS


This is the recommended method today and is documented
in Documentation/kbuild/kconfig-language.txt if
you need a bit more intro.

(*) I know we do not have kernel/Kconfig today.
    But maybe this is a good time to add it and
    source it from arch/Kconfig

	Sam
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