linux-kernel - Re: [PATCH 23/27] x86: debugctlmsr kconfig

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Date:	Sun, 25 Nov 2007 17:09:01 -0800
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 23/27] x86: debugctlmsr kconfig

On Sunday 25 November 2007 14:08, Roland McGrath wrote:
> This adds the (internal) Kconfig macro CONFIG_X86_DEBUGCTLMSR,
> to be defined when configuring to support only hardware that
> definitely supports MSR_IA32_DEBUGCTLMSR with the BTF flag.
>
> The Intel documentation says "P6 family" and later processors all have it.
> I think the Kconfig dependencies are right to have it set for those and
> unset for others (i.e., when 586 and earlier are supported).
>
> +config X86_DEBUGCTLMSR
> +	bool
> +	depends on !(M586MMX || M586TSC || M586 || M486 || M386)
> +	default y

Why is it defined in configuration system instead of some *.h file?
--
vda
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