Rafael J. Wysocki 5ab666e095 intel_pstate: Do not clear utilization update hooks on policy changes ... intel_pstate_set_policy() is invoked by the cpufreq core during driver initialization, on changes of policy attributes (minimim and maximum frequency, for example) via sysfs and via CPU notifications from the platform firmware. On some platforms the latter may occur relatively often. Commit bb6ab52f2b (intel_pstate: Do not set utilization update hook too early) made intel_pstate_set_policy() clear the CPU's utilization update hook before updating the policy attributes for it (and set the hook again after doind that), but that involves invoking synchronize_sched() and adds overhead to the CPU notifications mentioned above and to the sched-RCU handling in general. That extra overhead is arguably not necessary, because updating policy attributes when the CPU's utilization update hook is active should not lead to any adverse effects, so drop the clearing of the hook from intel_pstate_set_policy() and make it check if the hook has been set already when attempting to set it. Fixes: bb6ab52f2b (intel_pstate: Do not set utilization update hook too early) Reported-by: Jisheng Zhang <jszhang@marvell.com> Tested-by: Jisheng Zhang <jszhang@marvell.com> Tested-by: Doug Smythies <dsmythies@telus.net> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2016-06-27 23:47:15 +02:00
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acpi-cpufreq.c
amd_freq_sensitivity.c
arm_big_little_dt.c	cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table	2016-05-05 01:40:04 +02:00
arm_big_little.c	cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table	2016-05-05 01:40:04 +02:00
arm_big_little.h	cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table	2016-05-05 01:40:04 +02:00
at32ap-cpufreq.c
blackfin-cpufreq.c
cppc_cpufreq.c	cpufreq: ACPI / CPPC: Add module support for cppc_cpufreq driver	2016-04-25 15:59:35 +02:00
cpufreq_conservative.c
cpufreq_governor_attr_set.c
cpufreq_governor.c	cpufreq: governor: Fix handling of special cases in dbs_update()	2016-05-06 14:24:23 +02:00
cpufreq_governor.h	cpufreq: governor: Change confusing struct field and variable names	2016-04-28 15:10:08 +02:00
cpufreq_ondemand.c
cpufreq_ondemand.h
cpufreq_performance.c
cpufreq_powersave.c
cpufreq_stats.c
cpufreq_userspace.c	cpufreq: Fix GOV_LIMITS handling for the userspace governor	2016-05-05 01:30:38 +02:00
cpufreq-dt-platdev.c	cpufreq: tango: Use generic platdev driver	2016-05-05 01:36:57 +02:00
cpufreq-dt.c	cpufreq: dt: Kill platform-data	2016-04-28 15:22:43 +02:00
cpufreq-nforce2.c
cpufreq.c	cpufreq: Fix clamp_val() usage in cpufreq_driver_fast_switch()	2016-06-01 22:36:26 +02:00
cris-artpec3-cpufreq.c
cris-etraxfs-cpufreq.c
davinci-cpufreq.c
dbx500-cpufreq.c
e_powersaver.c	cpufreq: e_powersaver: Use IS_ENABLED() instead of checking for built-in or module	2016-04-27 22:42:34 +02:00
elanfreq.c
exynos5440-cpufreq.c
freq_table.c
gx-suspmod.c
highbank-cpufreq.c
ia64-acpi-cpufreq.c
imx6q-cpufreq.c
integrator-cpufreq.c
intel_pstate.c	intel_pstate: Do not clear utilization update hooks on policy changes	2016-06-27 23:47:15 +02:00
Kconfig	Merge branch 'pm-cpufreq-sched' into pm-cpufreq	2016-05-11 22:48:20 +02:00
Kconfig.arm	cpufreq: hisilicon: Use generic platdev driver	2016-04-25 16:18:24 +02:00
Kconfig.powerpc
Kconfig.x86	cpufreq: intel_pstate: Enforce _PPC limits	2016-04-28 01:01:39 +02:00
kirkwood-cpufreq.c
longhaul.c	Power management material for v4.7-rc1	2016-05-16 19:17:22 -07:00
longhaul.h
longrun.c
loongson1-cpufreq.c	CPUFREQ: Loongson1: Replace goto out with return in ls1x_cpufreq_probe()	2016-05-13 14:02:08 +02:00
loongson2_cpufreq.c
Makefile	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2016-05-19 10:02:26 -07:00
maple-cpufreq.c
mt8173-cpufreq.c	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2016-05-26 09:23:43 -07:00
mvebu-cpufreq.c	cpufreq: mvebu: Move cpufreq code into drivers/cpufreq/	2016-04-28 15:22:43 +02:00
omap-cpufreq.c	remove lots of IS_ERR_VALUE abuses	2016-05-27 15:26:11 -07:00
p4-clockmod.c
pasemi-cpufreq.c
pcc-cpufreq.c	cpufreq: pcc-cpufreq: Fix doorbell.access_width	2016-06-23 23:09:51 +02:00
pmac32-cpufreq.c	powerpc updates for 4.7	2016-05-20 10:12:41 -07:00
pmac64-cpufreq.c
powernow-k6.c
powernow-k7.c
powernow-k7.h
powernow-k8.c
powernow-k8.h
powernv-cpufreq.c	cpufreq: powernv: del_timer_sync when global and local pstate are equal	2016-05-11 02:28:00 +02:00
ppc_cbe_cpufreq_pervasive.c
ppc_cbe_cpufreq_pmi.c
ppc_cbe_cpufreq.c
ppc_cbe_cpufreq.h	cpufreq: e_powersaver: Use IS_ENABLED() instead of checking for built-in or module	2016-04-27 22:42:34 +02:00
pxa2xx-cpufreq.c
pxa3xx-cpufreq.c
qoriq-cpufreq.c	cpufreq: qoriq: Fix cooling device registration issue during suspend	2016-04-25 16:07:02 +02:00
s3c24xx-cpufreq-debugfs.c
s3c24xx-cpufreq.c
s3c64xx-cpufreq.c
s3c2410-cpufreq.c
s3c2412-cpufreq.c
s3c2416-cpufreq.c
s3c2440-cpufreq.c
s5pv210-cpufreq.c
sa1100-cpufreq.c
sa1110-cpufreq.c
sc520_freq.c
scpi-cpufreq.c	cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table	2016-05-05 01:40:04 +02:00
sfi-cpufreq.c
sh-cpufreq.c
sparc-us2e-cpufreq.c
sparc-us3-cpufreq.c
spear-cpufreq.c
speedstep-centrino.c
speedstep-ich.c
speedstep-lib.c
speedstep-lib.h
speedstep-smi.c
sti-cpufreq.c	cpufreq: st: enable selective initialization based on the platform	2016-04-28 15:25:56 +02:00
tegra20-cpufreq.c
tegra124-cpufreq.c
unicore2-cpufreq.c
vexpress-spc-cpufreq.c	cpufreq: arm_big_little: use generic OPP functions for {init, free}_opp_table	2016-05-05 01:40:04 +02:00