linux-kernel - Re: [build bug] lguest build failure: drivers/lguest/x86/switcher_32.S:(.text+0x3815f8): undefined reference to `LGUEST_PAGES_regs

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Date:	Sun, 17 Feb 2008 14:51:27 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Rusty Russell <rusty@...tcorp.com.au>
cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [build bug] lguest build failure: drivers/lguest/x86/switcher_32.S:(.text+0x3815f8):
 undefined reference to `LGUEST_PAGES_regs_trapnum'

On Mon, 4 Feb 2008, Rusty Russell wrote:

> On Saturday 02 February 2008 04:05:51 Ingo Molnar wrote:
> > looks similar to the previous one so i guess my quick fix attempt was a
> > bit too quick. Will turn lguest off again. And i'm willing to test
> > patches as well :)
> 
> Hi Ingo,
> 
>    OK, this problem was caused by asm-offsets.c only having the offsets when
> lguest *guest* support was set, not lguest host (host support used to imply
> guest support, so now they're separate these bugs come out).
> 
> Can you throw this patch into your tree for testing?
> 
> Thanks,
> Rusty.

Applied. Thanks,

	 tglx
 
> Lguest guest support and host support are separate config options: they used
> to be tied together.  Sort out which parts of asm-offsets are needed for Guest
> and Host.
> 
> Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
> 
> diff -r 7d5a5c7a4b95 arch/x86/kernel/asm-offsets_32.c
> --- a/arch/x86/kernel/asm-offsets_32.c	Sat Feb 02 23:13:05 2008 +1100
> +++ b/arch/x86/kernel/asm-offsets_32.c	Sun Feb 03 10:13:19 2008 +1100
> @@ -20,10 +20,8 @@
>  
>  #include <xen/interface/xen.h>
>  
> -#ifdef CONFIG_LGUEST_GUEST
>  #include <linux/lguest.h>
>  #include "../../../drivers/lguest/lg.h"
> -#endif
>  
>  #define DEFINE(sym, val) \
>          asm volatile("\n->" #sym " %0 " #val : : "i" (val))
> @@ -134,6 +132,10 @@ void foo(void)
>  	BLANK();
>  	OFFSET(LGUEST_DATA_irq_enabled, lguest_data, irq_enabled);
>  	OFFSET(LGUEST_DATA_pgdir, lguest_data, pgdir);
> +#endif
> +
> +#ifdef CONFIG_LGUEST
> +	BLANK();
>  	OFFSET(LGUEST_PAGES_host_gdt_desc, lguest_pages, state.host_gdt_desc);
>  	OFFSET(LGUEST_PAGES_host_idt_desc, lguest_pages, state.host_idt_desc);
>  	OFFSET(LGUEST_PAGES_host_cr3, lguest_pages, state.host_cr3);
> 
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