x86/aperfmperf: Integrate the fallback code from show_cpuinfo()

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Due to the avoidance of IPIs to idle CPUs arch_freq_get_on_cpu() can return
0 when the last sample was too long ago.

show_cpuinfo() has a fallback to cpufreq_quick_get() and if that fails to
return cpu_khz, but the readout code for the per CPU scaling frequency in
sysfs does not.

Move that fallback into arch_freq_get_on_cpu() so the behaviour is the same
when reading /proc/cpuinfo and /sys/..../cur_scaling_freq.

Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Doug Smythies <dsmythies@telus.net>
Link: https://lore.kernel.org/r/87pml5180p.ffs@tglx

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This commit is contained in:

Thomas Gleixner 2022-04-25 17:45:42 +02:00

parent f3eca381bd

commit fb4c77c21a

2 changed files with 8 additions and 9 deletions

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10

arch/x86/kernel/cpu/aperfmperf.c

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7

arch/x86/kernel/cpu/proc.c

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