linux-kernel - [PATCH v2] X86 architecture (32-bit and 64-bit): Convert to use jiffies macro

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Message-Id: <20240822082449.34601-1-chenyufan@vivo.com>
Date: Thu, 22 Aug 2024 16:24:49 +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 v2] 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>

The modifications made compared to the previous version are as follows:
1. Remove extra '+' in the header.
---
 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