linux-kernel - [PATCH] driver core: Use the ktime_us

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Message-ID: <20200803033343.1178-1-yuzenghui@huawei.com>
Date:   Mon, 3 Aug 2020 11:33:43 +0800
From:   Zenghui Yu <yuzenghui@...wei.com>
To:     <gregkh@...uxfoundation.org>, <rafael@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <wanghaibin.wang@...wei.com>,
        <tglx@...utronix.de>, Zenghui Yu <yuzenghui@...wei.com>
Subject: [PATCH] driver core: Use the ktime_us_delta() helper

Use the ktime_us_delta() helper to measure the driver probe time. Given the
helpers already returns an s64 value, let's drop the unnecessary casting to
s64 as well. There is no functional change.

Signed-off-by: Zenghui Yu <yuzenghui@...wei.com>
---
 drivers/base/dd.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 3cefe89e94ca..0ef5b2f32932 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -618,15 +618,14 @@ static int really_probe(struct device *dev, struct device_driver *drv)
  */
 static int really_probe_debug(struct device *dev, struct device_driver *drv)
 {
-	ktime_t calltime, delta, rettime;
+	ktime_t calltime, rettime;
 	int ret;
 
 	calltime = ktime_get();
 	ret = really_probe(dev, drv);
 	rettime = ktime_get();
-	delta = ktime_sub(rettime, calltime);
 	pr_debug("probe of %s returned %d after %lld usecs\n",
-		 dev_name(dev), ret, (s64) ktime_to_us(delta));
+		 dev_name(dev), ret, ktime_us_delta(rettime, calltime));
 	return ret;
 }
 
-- 
2.19.1