intel_pstate: Set CPU number before accessing MSRs

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commit 179e847167 upstream.

Ensure that cpu->cpu is set before writing MSR_IA32_PERF_CTL during CPU
initialization. Otherwise only cpu0 has its P-state set and all other
cores are left with their values unchanged.

In most cases, this is not too serious because the P-states will be set
correctly when the timer function is run.  But when the default governor
is set to performance, the per-CPU current_pstate stays the same forever
and no attempts are made to write the MSRs again.

Signed-off-by: Vincent Minet <vincent@vincent-minet.net>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Vincent Minet 2014-07-05 01:51:33 +02:00 • committed by Greg Kroah-Hartman

parent 01f4763e8f

commit 1663463de7

1 changed files with 1 additions and 2 deletions

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drivers/cpufreq/intel_pstate.c

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