x86: CPU: Fix up "cpu MHz" in /proc/cpuinfo

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Commit 890da9cf09 (Revert "x86: do not use cpufreq_quick_get() for
/proc/cpuinfo "cpu MHz"") is not sufficient to restore the previous
behavior of "cpu MHz" in /proc/cpuinfo on x86 due to some changes
made after the commit it has reverted.

To address this, make the code in question use arch_freq_get_on_cpu()
which also is used by cpufreq for reporting the current frequency of
CPUs and since that function doesn't really depend on cpufreq in any
way, drop the CONFIG_CPU_FREQ dependency for the object file
containing it.

Also refactor arch_freq_get_on_cpu() somewhat to avoid IPIs and
return cached values right away if it is called very often over a
short time (to prevent user space from triggering IPI storms through
it).

Fixes: 890da9cf09 (Revert "x86: do not use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz"")
Cc: stable@kernel.org   # 4.13 - together with 890da9cf09
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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This commit is contained in:

Rafael J. Wysocki 2017-11-03 16:35:49 +01:00 • committed by Linus Torvalds

parent 5cb0512c02

commit 941f5f0f6e

3 changed files with 11 additions and 6 deletions

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2

arch/x86/kernel/cpu/Makefile

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11

arch/x86/kernel/cpu/aperfmperf.c

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4

arch/x86/kernel/cpu/proc.c

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