linux-kernel - Re: [PATCH] x86: X86_HT always enable on X86

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Date:	Wed, 27 Feb 2008 14:00:01 -0800
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Adrian Bunk" <bunk@...nel.org>,
	"Hiroshi Shimamoto" <h-shimamoto@...jp.nec.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Sam Ravnborg" <sam@...nborg.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: X86_HT always enable on X86_64 SMP

On Wed, Feb 27, 2008 at 1:30 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Adrian Bunk wrote:
>  > On Wed, Feb 27, 2008 at 01:16:30PM -0800, Hiroshi Shimamoto wrote:
>  >> From: Hiroshi Shimamoto <h-shimamoto@...jp.nec.com>
>  >>
>  >> X86_HT is used for hyperthreading or multicore on 32-bit.
>  >> The X86_HT on 64-bit is different from 32-bit, it means hyperthreading only.
>  >> And X86_HT is not used on 64-bit except from cpu/initel_cacheinfo.c.
>  >>
>  >> Unify X86_HT for hyperthreading or multicore.
>  >> Turn X86_HT on when X86_64 and SMP are enabled.
>  >
>  > Please fix it properly instead - fiddling around with it the way you do
>  > only asks for trouble in the future.
>  >
>  > What we need are two different variables for:
>  > - hyperthreading and
>  > - multicore
>  >
>
>  He does, and calls them SCHED_SMT and SCHED_MC respectively.
>
>  It's not particularly clear to me what X86_HT is meant to be used for
>  anymore at all.

he made X86_HT can be enabled when only Opteron supported is enabled.

it should be stated in the comments.
YH
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