linux-kernel - Re: [RFT][PATCH] ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode() (was: Re: [RFC PATCH 00/14] Support timezone of ACPI TAD and EFI TIME)

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Date:	Mon, 13 Jan 2014 19:04:56 -0700
From:	Toshi Kani <toshi.kani@...com>
To:	Borislav Petkov <bp@...e.de>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Matt Fleming <matt@...sole-pimps.org>,
	"H. Peter Anvin" <hpa@...or.com>, joeyli <jlee@...e.com>,
	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
Subject: Re: [RFT][PATCH] ACPI / init: Run acpi_early_init() before
 efi_enter_virtual_mode() (was: Re: [RFC PATCH 00/14] Support timezone of
 ACPI TAD and EFI TIME)

On Sun, 2014-01-12 at 10:06 +0100, Borislav Petkov wrote:
> On Sun, Jan 12, 2014 at 01:30:23AM +0100, Rafael J. Wysocki wrote:
> > I don't see any adverse effects of the patch below on a couple of my test
> > boxes, but (a) they are Intel-based and (b) they are non-EFI, so it would be
> > good to give it a go on as many machines as reasonably possible.
> > 
> > Thanks,
> > Rafael
> > 
> > ---
> > From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Subject: ACPI / init: Run acpi_early_init() before efi_enter_virtual_mode()
> > 
> > According to Matt Fleming, if acpi_early_init() was executed befpre
> > efi_enter_virtual_mode(), the EFI initialization could benefit from
> > it, so make that happen.
> > 
> > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > ---
> >  init/main.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > Index: linux-pm/init/main.c
> > ===================================================================
> > --- linux-pm.orig/init/main.c
> > +++ linux-pm/init/main.c
> > @@ -615,6 +615,7 @@ asmlinkage void __init start_kernel(void
> >  	calibrate_delay();
> >  	pidmap_init();
> >  	anon_vma_init();
> > +	acpi_early_init();
> >  #ifdef CONFIG_X86
> >  	if (efi_enabled(EFI_RUNTIME_SERVICES))
> >  		efi_enter_virtual_mode();
> > @@ -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)) {
> >
> 
> Looks good both on kvm+OVMF and on my Dell EFI box.
> 
> Tested-by: Borislav Petkov <bp@...e.de>
> 
> Toshi has a big EFI box though - if he could run it too, that would be
> great :-)

Yes, I will test the change.

Thanks,
-Toshi

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