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

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Date:	Wed, 15 Nov 2006 18:49:57 +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:

> Machine boots but freeze when init starts. Any idea ?

probably caused by this:

> +# define GET_CPU_NUM(reg)

>  #define FIXUP_ESPFIX_STACK \
>  	/* since we are on a wrong stack, we cant make it a C code :( */ \
> -	movl %gs:PDA_cpu, %ebx; \
> +	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.

	Ingo
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