]> git.proxmox.com Git - mirror_ubuntu-kernels.git/commit
cpufreq / ACPI: Fix not loading acpi-cpufreq driver regression
authorThomas Renninger <trenn@suse.de>
Thu, 12 Jul 2012 10:24:33 +0000 (12:24 +0200)
committerRafael J. Wysocki <rjw@sisk.pl>
Thu, 12 Jul 2012 20:39:32 +0000 (22:39 +0200)
commitc4686c71a9183f76e3ef59098da5c098748672f6
treeb577b21cd2d384ff9ddafef803e03e873aa4f8d3
parentbd0a521e88aa7a06ae7aabaed7ae196ed4ad867a
cpufreq / ACPI: Fix not loading acpi-cpufreq driver regression

Commit d640113fe80e45ebd4a5b420b introduced a regression on SMP
systems where the processor core with ACPI id zero is disabled
(typically should be the case because of hyperthreading).
The regression got spread through stable kernels.
On 3.0.X it got introduced via 3.0.18.

Such platforms may be rare, but do exist.
Look out for a disabled processor with acpi_id 0 in dmesg:
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x10] disabled)

This problem has been observed on a:
HP Proliant BL280c G6 blade

This patch restricts the introduced workaround to platforms
with nr_cpu_ids <= 1.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: stable@vger.kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
drivers/acpi/processor_core.c