diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2022-04-25 17:45:42 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-04-27 20:22:20 +0200 |
| commit | fb4c77c21aba03677f283acda3cae748ef866abf (patch) | |
| tree | 2d3689f56b007492a481ba10ae6f4951158e9c8f /arch/x86/kernel/cpu/proc.c | |
| parent | f3eca381bd49d708073ba1a9af4fa6ea5d5810a6 (diff) | |
x86/aperfmperf: Integrate the fallback code from show_cpuinfo()
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
Diffstat (limited to 'arch/x86/kernel/cpu/proc.c')
| -rw-r--r-- | arch/x86/kernel/cpu/proc.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c index 0a0ee55830c7..099b6f0d96bd 100644 --- a/arch/x86/kernel/cpu/proc.c +++ b/arch/x86/kernel/cpu/proc.c @@ -86,12 +86,7 @@ static int show_cpuinfo(struct seq_file *m, void *v) if (cpu_has(c, X86_FEATURE_TSC)) { unsigned int freq = arch_freq_get_on_cpu(cpu); - if (!freq) - freq = cpufreq_quick_get(cpu); - if (!freq) - freq = cpu_khz; - seq_printf(m, "cpu MHz\t\t: %u.%03u\n", - freq / 1000, (freq % 1000)); + seq_printf(m, "cpu MHz\t\t: %u.%03u\n", freq / 1000, (freq % 1000)); } /* Cache size */ |