path: root/init
diff options
authorRafael J. Wysocki <>2015-06-10 01:33:36 +0200
committerRafael J. Wysocki <>2015-06-10 23:51:27 +0200
commitb064a8fa77dfead647564c46ac8fc5b13bd1ab73 (patch)
tree1785d715d4bb3671c44fa2c01341a89059286e94 /init
parentd4a4f75cd8f29cd9464a5a32e9224a91571d6649 (diff)
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: 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 <>
Diffstat (limited to 'init')
1 files changed, 1 insertions, 0 deletions
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)
+ acpi_subsystem_init();
if (efi_enabled(EFI_RUNTIME_SERVICES)) {