linux-kernel - Re: [RFT][PATCH] ACPI / init: Run acpi_early_init() before efi_enter_virtual

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Date:	Tue, 14 Jan 2014 10:00:52 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	joeyli <jlee@...e.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	Toshi Kani <toshi.kani@...com>
CC:	Matt Fleming <matt@...sole-pimps.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Matthew Garrett <matthew.garrett@...ula.com>, Elliott@...com,
	samer.el-haj-mahmoud@...com, Oliver Neukum <oneukum@...e.de>,
	werner@...e.com, trenn@...e.de, JBeulich@...e.com,
	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	x86@...nel.org,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	linux-acpi@...r.kernel.org, Borislav Petkov <bp@...e.de>
Subject: Re: [RFT][PATCH] ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode()

On 01/13/2014 08:09 PM, joeyli wrote:
> 
> This patch works to me on Acer Gateway Z5WT2 UEFI notebook and Intel
> UEFI development board.
> 
> Does it possible move acpi_early_init() to before timekeeping_init()?
> The position is also before efi_enter_virtual_mode() and that will be
> useful for parsing ACPI TAD to set system clock:
> 
> diff --git a/init/main.c b/init/main.c
> index febc511..b6d93c8 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -565,6 +565,7 @@ asmlinkage void __init start_kernel(void)
>         init_timers();
>         hrtimers_init();
>         softirq_init();
> +       acpi_early_init();
>         timekeeping_init();
>         time_init();
>         sched_clock_postinit();
> @@ -641,7 +642,6 @@ asmlinkage void __init start_kernel(void)
>  
>         check_bugs();
>  
> -       acpi_early_init(); /* before LAPIC and SMP init */
>         sfi_init_late();
>  
>         if (efi_enabled(EFI_RUNTIME_SERVICES)) {
> 

Hi Toshi,

Could you try this variant, too?  If this works as well then we end up
solving two problems in one patch...

	-hpa



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