Use time_after() instead of using
jiffies directly to handle wraparound.
Signed-off-by: Chen Yufan <chenyufan@vivo.com>
---
The modifications made compared to the previous version are as follows:
1. Remove extra '+' in the header.
2. Change the subject and description for clarity.
---
arch/x86/kernel/cpu/aperfmperf.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmperf.c
index 0b69bfbf345d..2772cc166b1b 100644
--- a/arch/x86/kernel/cpu/aperfmperf.c
+++ b/arch/x86/kernel/cpu/aperfmperf.c
@@ -16,6 +16,7 @@
#include <linux/sched/topology.h>
#include <linux/smp.h>
#include <linux/syscore_ops.h>
+#include <linux/jiffies.h>
#include <asm/cpu.h>
#include <asm/cpu_device_id.h>
@@ -434,7 +435,7 @@ 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_after(jiffies, last + MAX_SAMPLE_AGE))
goto fallback;
return div64_u64((cpu_khz * acnt), mcnt);
--
2.39.0