cpufreq: powernv: Remove cpu_to_chip_id() from hot-path

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cpu_to_chip_id() does a DT walk through to find out the chip id by
taking a contended device tree lock. This adds an unnecessary overhead
in a hot path. So instead of calling cpu_to_chip_id() everytime cache
the chip ids for all cores in the array 'core_to_chip_map' and use it
in the hotpath.

Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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Shilpasri G Bhat 2016-02-03 01:11:39 +05:30 • committed by Rafael J. Wysocki

parent 6d167a44e6

commit 96c4726f01

1 changed files with 20 additions and 3 deletions

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drivers/cpufreq/powernv-cpufreq.c

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