linux-kernel - [PATCH] timekeeping: use time_is_before

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Date:   Sun, 27 Feb 2022 19:15:39 -0800
From:   Qing Wang <wangqing@...o.com>
To:     John Stultz <john.stultz@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: [PATCH] timekeeping: use time_is_before_jiffies() instead of open coding it

From: Wang Qing <wangqing@...o.com>

Use the helper function time_is_{before,after}_jiffies() to improve
code readability.

Signed-off-by: Wang Qing <wangqing@...o.com>
---
 kernel/time/timekeeping.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index dcdcb85..6f32ac6
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -215,7 +215,7 @@ static void timekeeping_check_update(struct timekeeper *tk, u64 offset)
 	}
 
 	if (tk->underflow_seen) {
-		if (jiffies - tk->last_warning > WARNING_FREQ) {
+		if (time_is_before_jiffies(tk->last_warning + WARNING_FREQ)) {
 			printk_deferred("WARNING: Underflow in clocksource '%s' observed, time update ignored.\n", name);
 			printk_deferred("         Please report this, consider using a different clocksource, if possible.\n");
 			printk_deferred("         Your kernel is probably still fine.\n");
@@ -225,7 +225,7 @@ static void timekeeping_check_update(struct timekeeper *tk, u64 offset)
 	}
 
 	if (tk->overflow_seen) {
-		if (jiffies - tk->last_warning > WARNING_FREQ) {
+		if (time_is_before_jiffies(tk->last_warning + WARNING_FREQ)) {
 			printk_deferred("WARNING: Overflow in clocksource '%s' observed, time update capped.\n", name);
 			printk_deferred("         Please report this, consider using a different clocksource, if possible.\n");
 			printk_deferred("         Your kernel is probably still fine.\n");
-- 
2.7.4