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

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Date:	Tue, 14 Jan 2014 13:32:27 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	joeyli <jlee@...e.com>, "Rafael J. Wysocki" <rjw@...ysocki.net>,
	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 Tue, 2014-01-14 at 10:00 -0800, H. Peter Anvin wrote:
> 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...

Hi Peter,

Yes, this version works fine as well.

Tested-by: Toshi Kani <toshi.kani@...com>

Thanks,
-Toshi

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