]> git.karo-electronics.de Git - linux-beck.git/commit
cpufreq: powernv: Remove cpu_to_chip_id() from hot-path
authorShilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Tue, 2 Feb 2016 19:41:39 +0000 (01:11 +0530)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Fri, 5 Feb 2016 01:38:02 +0000 (02:38 +0100)
commit96c4726f01cdbf53acf74cf2394e287d74bf40a3
tree65370c8647c10d1e32d14ba3ecb14db0bd875e50
parent6d167a44e6c8da3316e037b788585fcf96112bea
cpufreq: powernv: Remove cpu_to_chip_id() from hot-path

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>
drivers/cpufreq/powernv-cpufreq.c