linux-kernel - Re: [crash, bisected] Re: [PATCH 3/4] x86

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Message-ID: <485ADC73.60009@goop.org>
Date:	Thu, 19 Jun 2008 15:23:47 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Mike Travis <travis@....com>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Christoph Lameter <clameter@....com>,
	Jack Steiner <steiner@....com>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area

Mike Travis wrote:
> @@ -132,6 +133,12 @@ ident_complete:
>  #ifdef CONFIG_SMP
>  	addq	%rbp, trampoline_level4_pgt + 0(%rip)
>  	addq	%rbp, trampoline_level4_pgt + (511*8)(%rip)
> +
> +	/*
> +	 * Fix up per_cpu__gdt_page offset when basing percpu
> +	 * variables at zero.  This is only needed for the boot cpu.
> +	 */
> +	addq	$__per_cpu_load, early_gdt_descr_base
>   

This needs to be rip-relative.  An absolute reference here will fail 
because you're still running in physical addresses.

    J
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