linux-kernel - Re: [PATCH] i386-pda UP optimization

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Date:	Wed, 15 Nov 2006 19:01:05 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <ak@...e.de>, akpm@...l.org,
	Arjan van de Ven <arjan@...radead.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386-pda UP optimization


* Eric Dumazet <dada1@...mosbay.com> wrote:

> > > +	GET_CPU_NUM(%ebx) \
> > >  	PER_CPU(cpu_gdt_descr, %ebx); \
> > >  	movl GDS_address(%ebx), %ebx; \
> >
> > %ebx very definitely wants to have a current CPU number loaded ;) Pick
> > it up from the task struct.
> 
> Hum.... Are you sure ?
> 
> For UP we have this PER_CPU definition :
> 
> #define PER_CPU(var, cpu) \
>         movl $per_cpu__/**/var, cpu;

hm, you are right. No quick ideas then.

	Ingo
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