linux-kernel - [PATCH] acpi: Use time_before() for time comparison

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Date:	Thu, 22 May 2014 22:56:36 +0200
From:	Manuel Schölling <manuel.schoelling@....de>
To:	rjw@...ysocki.net
Cc:	lenb@...nel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Manuel Schölling <manuel.schoelling@....de>
Subject: [PATCH] acpi: Use time_before() for time comparison

To be future-proof and for better readability the time comparisons are modified
to use time_before() instead of plain, error-prone math.

Signed-off-by: Manuel Schölling <manuel.schoelling@....de>
---
 drivers/acpi/acpi_pad.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/acpi_pad.c b/drivers/acpi/acpi_pad.c
index 37d7302..0a3bbf5 100644
--- a/drivers/acpi/acpi_pad.c
+++ b/drivers/acpi/acpi_pad.c
@@ -156,12 +156,13 @@ static int power_saving_thread(void *data)
 
 	while (!kthread_should_stop()) {
 		int cpu;
-		u64 expire_time;
+		unsigned long expire_time;
 
 		try_to_freeze();
 
 		/* round robin to cpus */
-		if (last_jiffies + round_robin_time * HZ < jiffies) {
+		expire_time = last_jiffies + round_robin_time * HZ;
+		if (time_before(expire_time, jiffies)) {
 			last_jiffies = jiffies;
 			round_robin_cpu(tsk_index);
 		}
@@ -200,7 +201,7 @@ static int power_saving_thread(void *data)
 					CLOCK_EVT_NOTIFY_BROADCAST_EXIT, &cpu);
 			local_irq_enable();
 
-			if (jiffies > expire_time) {
+			if (time_before(expire_time, jiffies)) {
 				do_sleep = 1;
 				break;
 			}
-- 
1.7.10.4

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