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

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Date:	Wed, 15 Jan 2014 04:16:59 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Matt Fleming <matt@...sole-pimps.org>,
	Matthew Garrett <matthew.garrett@...ula.com>
CC:	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, "Lee, Chun-Yi" <jlee@...e.com>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH] ACPI / init: Run acpi_early_init() before timekeeping_init()

Rafael, you want to take this one?

On 01/14/2014 11:25 PM, Lee, Chun-Yi wrote:
> This is a variant patch from Rafael J. Wysocki's
> ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode()
> 
> According to Matt Fleming, if acpi_early_init() was executed before
> efi_enter_virtual_mode(), the EFI initialization could benefit from
> it, so Rafael's patch makes that happen.
> 
> And, we want accessing ACPI TAD device to set system clock, so move
> acpi_early_init() before timekeeping_init(). This final position is
> also before efi_enter_virtual_mode().
> 
> v2:
> Move acpi_early_init() before timekeeping_init() to prepare setting
> system clock with ACPI TAD.
> 
> v1:
> Rafael J. Wysocki
> ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode()
> 
> Cc: Rafael J. Wysocki <rjw@...ysocki.net>
> Cc: Matt Fleming <matt@...sole-pimps.org>
> Cc: H. Peter Anvin <hpa@...or.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Matthew Garrett <matthew.garrett@...ula.com>
> Tested-by: Toshi Kani <toshi.kani@...com>
> Signed-off-by: Lee, Chun-Yi <jlee@...e.com>
> ---
>  init/main.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> 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)) {
> 

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