linux-kernel - Re: [PATCH] x86 ACPI: Fix resume from suspend to RAM on uniprocessor x86-64

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Message-Id: <200807050008.30497.Rafal.Wysocki@fuw.edu.pl>
Date:	Sat, 5 Jul 2008 00:08:29 +0200
From:	"R. J. Wysocki" <Rafal.Wysocki@....edu.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Dionisus Torimens <djtm@....net>
Subject: Re: [PATCH] x86 ACPI: Fix resume from suspend to RAM on uniprocessor x86-64

On Saturday, 5 of July 2008, Rafael J. Wysocki wrote:
> Hi Ingo,
> 
> This is a regression fix, please push to Linus ASAP.
> 
> Thanks,
> Rafael
> 
> ---
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Since the trampoline code is now used for ACPI resume from suspend to RAM,
> the trampoline page tables have to be fixed up during boot not only on SMP
> systems, but also on UP systems that use the trampoline.
> 
> Reference: http://bugzilla.kernel.org/show_bug.cgi?id=10923
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>

I should have added:

Reported-by: Dionisus Torimens <djtm@....net>

> ---
>  arch/x86/kernel/head_64.S |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-2.6/arch/x86/kernel/head_64.S
> ===================================================================
> --- linux-2.6.orig/arch/x86/kernel/head_64.S
> +++ linux-2.6/arch/x86/kernel/head_64.S
> @@ -128,7 +128,7 @@ ident_complete:
>  	/* Fixup phys_base */
>  	addq	%rbp, phys_base(%rip)
>  
> -#ifdef CONFIG_SMP
> +#ifdef CONFIG_X86_TRAMPOLINE
>  	addq	%rbp, trampoline_level4_pgt + 0(%rip)
>  	addq	%rbp, trampoline_level4_pgt + (511*8)(%rip)
>  #endif
> --
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> 
> 



-- 
Rafael J. Wysocki, Ph.D.
Institute of Theoretical Physics
Faculty of Physics of Warsaw University
ul. Hoza 69, 00-681 Warsaw
[tel: +48 22 55 32 263]
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