linux-kernel - Re: [PATCH 1/1] x86

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Date:	Tue, 10 Feb 2009 11:08:16 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	lenb@...nel.org, mingo@...hat.com, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH 1/1] x86_64: fix s3 fail path

> As acpi_enter_sleep_state can fail, take this into account in
> do_suspend_lowlevel and don't return to the do_suspend_lowlevel's
> caller. This would break (currently) fpu status and preempt count.
> 
> Technically, this means use `call' instead of `jmp' and `jmp' to
> the `resume_point' after the `call' (i.e. if
> acpi_enter_sleep_state returns=fails). `resume_point' will handle
> the restore of fpu and preempt count gracefully.
> 
> Signed-off-by: Jiri Slaby <jirislaby@...il.com>
> Cc: Len Brown <lenb@...nel.org>
> Cc: Pavel Machek <pavel@...e.cz>

Acked-by: Pavel Machek <pavel@...e.cz>

> Cc: Rafael J. Wysocki <rjw@...k.pl>
> ---
>  arch/x86/kernel/acpi/wakeup_64.S |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S
> index b5dee6a..96258d9 100644
> --- a/arch/x86/kernel/acpi/wakeup_64.S
> +++ b/arch/x86/kernel/acpi/wakeup_64.S
> @@ -73,7 +73,9 @@ ENTRY(do_suspend_lowlevel)
>  	addq	$8, %rsp
>  	movl	$3, %edi
>  	xorl	%eax, %eax
> -	jmp	acpi_enter_sleep_state
> +	call	acpi_enter_sleep_state
> +	/* in case something went wrong, restore the machine status and go on */
> +	jmp	resume_point
>  
>  	.align 4
>  resume_point:

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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