time_is_before_jiffies deals with timer wrapping correctly. Signed-off-by: Yu Zhe <yuzhe@xxxxxxxxxxxx> --- arch/x86/kernel/cpu/aperfmperf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c index 1f60a2b27936..22e0bac3fffe 100644 --- a/arch/x86/kernel/cpu/aperfmperf.c +++ b/arch/x86/kernel/cpu/aperfmperf.c @@ -423,7 +423,7 @@ unsigned int arch_freq_get_on_cpu(int cpu) * Bail on invalid count and when the last update was too long ago, * which covers idle and NOHZ full CPUs. */ - if (!mcnt || (jiffies - last) > MAX_SAMPLE_AGE) + if (!mcnt || time_is_before_jiffies(last + MAX_SAMPLE_AGE)) goto fallback; return div64_u64((cpu_khz * acnt), mcnt); -- 2.11.0
