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Message-Id: <20240822034721.9561-1-chenyufan@vivo.com>
Date: Thu, 22 Aug 2024 11:47:21 +0800
From: Chen Yufan <chenyufan@...o.com>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>,
x86@...nel.org,
"H. Peter Anvin" <hpa@...or.com>,
Chen Yufan <chenyufan@...o.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
linux-kernel@...r.kernel.org
Cc: opensource.kernel@...o.com
Subject: [PATCH v1] X86 architecture (32-bit and 64-bit): Convert to use jiffies macro
Use time_after macro instead of using
jiffies directly to handle wraparound.
Signed-off-by: Chen Yufan <chenyufan@...o.com>
---
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 0b69bfbf3..5fe0a7576 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
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