linux-kernel - Re: [PATCH] fix ACPI induced voyager compile failure

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Message-ID: <20081030215819.GI30303@elte.hu>
Date:	Thu, 30 Oct 2008 22:58:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fix ACPI induced voyager compile failure


* James Bottomley <James.Bottomley@...senPartnership.com> wrote:

> >From c339b7cdc39399855ec07dfbff67304f9c7fa49a Mon Sep 17 00:00:00 2001
> From: James Bottomley <James.Bottomley@...senPartnership.com>
> Date: Wed, 29 Oct 2008 10:58:13 -0500
> Subject: [VOYAGER] x86: don't pull asm/acpi.h into fixmap_32.h
> 
> If it's not needed it causes compile failures.
> 
> Signed-off-by: James Bottomley <James.Bottomley@...senPartnership.com>
> ---
>  arch/x86/include/asm/fixmap_32.h |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/include/asm/fixmap_32.h b/arch/x86/include/asm/fixmap_32.h
> index 09f29ab..c3302ee 100644
> --- a/arch/x86/include/asm/fixmap_32.h
> +++ b/arch/x86/include/asm/fixmap_32.h
> @@ -25,7 +25,9 @@ extern unsigned long __FIXADDR_TOP;
>  
>  #ifndef __ASSEMBLY__
>  #include <linux/kernel.h>
> +#ifdef CONFIG_ACPI
>  #include <asm/acpi.h>
> +#endif

hm, that's quite ugly - such headers are supposed to be safe even if 
CONFIG_APIC is not turned on.

What kind of compiler failures are you getting, could you send the 
.config that triggers it? I'm curious what the real cause of the build 
failure is - the #ifdef you are adding seems to fix a symptom, not a 
real bug - and maybe we can do a better fix.

Thanks,

	Ingo
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