linux-kernel - Re: [PATCH] x86: add specific support for Intel Atom architecture

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Message-ID: <87r5y4cqub.fsf@basil.nowhere.org>
Date:	Mon, 01 Jun 2009 10:15:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Tobias Doerffel <tobias.doerffel@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: add specific support for Intel Atom architecture

Tobias Doerffel <tobias.doerffel@...il.com> writes:

> This adds another option when selecting CPU family so the kernel can
> be optimized for Intel Atom CPUs. If GCC supports tuning options for
> Intel Atom they will be used.

You seem to have ignored the earlier review feedback?

Like

> diff --git a/arch/x86/include/asm/module.h b/arch/x86/include/asm/module.h
> index 47d6274..e959c4a 100644
> --- a/arch/x86/include/asm/module.h
> +++ b/arch/x86/include/asm/module.h
> @@ -28,6 +28,8 @@ struct mod_arch_specific {};
>  #define MODULE_PROC_FAMILY "586MMX "
>  #elif defined CONFIG_MCORE2
>  #define MODULE_PROC_FAMILY "CORE2 "
> +#elif defined CONFIG_MATOM
> +#define MODULE_PROC_FAMILY "ATOM "

This is not needed because Atom is compatible to CORE2 (except for
one instruction the kernel doesn't use)

+	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
+		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))

It's doubtful that tune=generic is the best fallback for Atom, likely
tune=p5 is better


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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