On Sat, 2015-05-30 at 14:21 +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wyso...@intel.com> > > 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 <tolzm...@molgen.mpg.de> > Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
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().) Otherwise, the change looks good. Acked-by: Toshi Kani <toshi.k...@hp.com> Thanks, -Toshi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
