https://github.com/torvalds/linux
Revision c4686c71a9183f76e3ef59098da5c098748672f6 authored by Thomas Renninger on 12 July 2012, 10:24:33 UTC, committed by Rafael J. Wysocki on 12 July 2012, 20:39:32 UTC
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>
1 parent bd0a521
History
Tip revision: c4686c71a9183f76e3ef59098da5c098748672f6 authored by Thomas Renninger on 12 July 2012, 10:24:33 UTC
cpufreq / ACPI: Fix not loading acpi-cpufreq driver regression
Tip revision: c4686c7
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