On Wed, 2015-06-10 at 01:48 +0200, Rafael J. Wysocki wrote: > On Wednesday, June 03, 2015 11:13:57 AM Toshi Kani wrote: > > On Sat, 2015-05-30 at 14:21 +0200, Rafael J. Wysocki wrote: > > > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > > > > > 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 > > > Reported-and-tested-by: Marius Tolzmann <tolzmann@xxxxxxxxxxxxx> > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > > > Can you add comments to acpi_early_init() and acpi_subsystem_init() to > > clarify what ACPI features are enabled at each phase, and what > > dependency they have in the boot sequence? (The same goes to > > early_acpi_boot_init() and acpi_boot_init().) > > OK, update follows. Very helpful. Thanks for the update. -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
