linux-kernel - [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:	Sun, 12 Jan 2014 01:30:23 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	"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, Borislav Petkov <bp@...e.de>
Subject: [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 Saturday, December 21, 2013 12:21:48 PM Matt Fleming wrote:
> On Fri, 20 Dec, at 11:18:56PM, Rafael J. Wysocki wrote:
> > 
> > I'm not sure 100%, but I *think* we need to do that with interrupts enabled.
> > At least after mm_init(), because it relies on things initialized there if I
> > remember correctly.
> > 
> > From what I can tell at the moment, it might be possible to move it before
> > efi_enter_virtual_mode() if that would help.
> 
> Actually yeah, that would be super useful, and I think we'd be able to
> get rid of the whole efi_late_init() stuff because we'd no longer need
> to hang on to the EFI_BOOT_SERVICES* regions after
> SetVirtualAddressMap().

OK

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)) {

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