From b064a8fa77dfead647564c46ac8fc5b13bd1ab73 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 10 Jun 2015 01:33:36 +0200 Subject: ACPI / init: Switch over platform to the ACPI mode later Commit 73f7d1ca3263 "ACPI / init: Run acpi_early_init() before timekeeping_init()" moved the ACPI subsystem initialization, including the ACPI mode enabling, to an earlier point in the initialization sequence, to allow the timekeeping subsystem use ACPI early. Unfortunately, that resulted in boot regressions on some systems and the early ACPI initialization was moved toward its original position in the kernel initialization code by commit c4e1acbb35e4 "ACPI / init: Invoke early ACPI initialization later". However, that turns out to be insufficient, as boot is still broken on the Tyan S8812 mainboard. To fix that issue, split the ACPI early initialization code into two pieces so the majority of it still located in acpi_early_init() and the part switching over the platform into the ACPI mode goes into a new function, acpi_subsystem_init(), executed at the original early ACPI initialization spot. That fixes the Tyan S8812 boot problem, but still allows ACPI tables to be loaded earlier which is useful to the EFI code in efi_enter_virtual_mode(). Link: https://bugzilla.kernel.org/show_bug.cgi?id=97141 Fixes: 73f7d1ca3263 "ACPI / init: Run acpi_early_init() before timekeeping_init()" Reported-and-tested-by: Marius Tolzmann Signed-off-by: Rafael J. Wysocki Acked-by: Toshi Kani Reviewed-by: Hanjun Guo Reviewed-by: Lee, Chun-Yi --- init/main.c | 1 + 1 file changed, 1 insertion(+) (limited to 'init') diff --git a/init/main.c b/init/main.c index 2115055faeac..2a89545e0a5d 100644 --- a/init/main.c +++ b/init/main.c @@ -664,6 +664,7 @@ asmlinkage __visible void __init start_kernel(void) check_bugs(); + acpi_subsystem_init(); sfi_init_late(); if (efi_enabled(EFI_RUNTIME_SERVICES)) { -- cgit v1.2.3-59-g8ed1b