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

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Message-ID: <485BFFC5.6020404@sgi.com>
Date:	Fri, 20 Jun 2008 12:06:45 -0700
From:	Mike Travis <travis@....com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Christoph Lameter <clameter@....com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu
 area

Jeremy Fitzhardinge wrote:
>
> 
> BTW, I think __per_cpu_load will cause trouble if you make a relocatable
> kernel, being an absolute symbol.  But I have relocation off at the moment.
> 
...
Here's where it's defined (in include/asm-generic/vmlinux.lds.h):

#ifdef CONFIG_HAVE_ZERO_BASED_PER_CPU
#define PERCPU(align)                                                   \
        . = ALIGN(align);                                               \
        percpu : { } :percpu                                            \
        __per_cpu_load = .;                                             \
        .data.percpu 0 : AT(__per_cpu_load - LOAD_OFFSET) {             \
                *(.data.percpu.first)                                   \
                *(.data.percpu.shared_aligned)                          \
                *(.data.percpu)                                         \
                *(.data.percpu.page_aligned)                            \
                ____per_cpu_size = .;                                   \
        }                                                               \
        . = __per_cpu_load + ____per_cpu_size;                          \
        data : { } :data
#else

Can we generate a new symbol which would account for LOAD_OFFSET?
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