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

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Message-Id: <1389770748-32698-1-git-send-email-jlee@suse.com>
Date:	Wed, 15 Jan 2014 15:25:48 +0800
From:	"Lee, Chun-Yi" <joeyli.kernel@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	"H. Peter Anvin" <hpa@...or.com>,
	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>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Matt Fleming <matt@...sole-pimps.org>,
	"H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
	Matthew Garrett <matthew.garrett@...ula.com>
Subject: [PATCH] ACPI / init: Run acpi_early_init() before timekeeping_init()

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)) {
-- 
1.6.4.2

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