linux-kernel - Re: [2.6 patch] x86: revert X86

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Message-ID: <20071115184800.GT4250@stusta.de>
Date:	Thu, 15 Nov 2007 19:48:00 +0100
From:	Adrian Bunk <bunk@...nel.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [2.6 patch] x86: revert X86_HT semantics change

On Thu, Nov 15, 2007 at 07:42:55PM +0100, Sam Ravnborg wrote:
> On Thu, Nov 15, 2007 at 07:07:11PM +0100, Thomas Gleixner wrote:
> > On Thu, 15 Nov 2007, Sam Ravnborg wrote:
> > 
> > > On Thu, Nov 15, 2007 at 05:17:03PM +0100, Adrian Bunk wrote:
> > > > The x86 unification resulted in CONFIG_X86_HT no longer being
> > > > set if (X86_32 && MK8).
> > > Yup - my bad. I wrongly assumed MK8 was an X86_64 thing.
> > > 
> > > Thanks for fixing this.
> > > > 
> > > > After grep'ing through the tree I think the problem is that different 
> > > > places have different assumptions about the semantics of CONFIG_X86_HT,
> > > > either:
> > > > - hyperthreading or
> > > > - multicore
> > > > and the SCHED_SMT and SCHED_MC dependencies are just one of the 
> > > > symptoms.
> > > > 
> > > > This should be sorted out properly, but until then we should keep the 
> > > > 2.6.23 status quo.
> > > > 
> > > > Signed-off-by: Adrian Bunk <bunk@...nel.org>
> > > Acked-by: Sam Ravnborg <sam@...nborg.org>
> > > 
> > > I assume Thomas & Co will forward the patch.
> > 
> > After looking what does what and fixing it. 
> > 
> > Right now this patch is not a 1:1 replacement of the .23 status quo,
> > as it now makes SCHED_SMT and SCHED_HT depend on !MK8 for 64bit.
> 
> I assumed this was intentional - Adrian?

No, it was just buggy...

> 	Sam

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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