Piteball/android_kernel_google_msm
1
0
Fork 0
mirror of https://github.com/followmsi/android_kernel_google_msm.git synced 2024-11-06 23:17:41 +00:00
Code Issues Projects Releases Wiki Activity

cpufreq / ACPI: Fix not loading acpi-cpufreq driver regression

Browse source 
commit c4686c71a9 upstream.

Commit d640113fe8 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>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Renninger 2012-07-12 12:24:33 +02:00 committed by Greg Kroah-Hartman
parent af3a2390c0
commit 667fb55089
1 changed files with 4 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/acpi/processor_core.c
View file

@ -189,10 +189,12 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
* Processor (CPU3, 0x03, 0x00000410, 0x06) {}
* }
*
* Ignores apic_id and always return 0 for CPU0's handle.
* Ignores apic_id and always returns 0 for the processor
* handle with acpi id 0 if nr_cpu_ids is 1.
* This should be the case if SMP tables are not found.
* Return -1 for other CPU's handle.
*/
if (acpi_id == 0)
if (nr_cpu_ids <= 1 && acpi_id == 0)
return acpi_id;
else
return apic_id;