linux-kernel - [PATCH v1 1/1] iopoll: Use fsleep() instead of usleep

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Message-ID: <20250502134346.4146857-1-andriy.shevchenko@linux.intel.com>
Date: Fri,  2 May 2025 16:43:45 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Anna-Maria Behnsen <anna-maria@...utronix.de>,
	linux-kernel@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/1] iopoll: Use fsleep() instead of usleep_range()

Use fsleep() instead of usleep_range() to improve small time delays
by avoiding the timer use. With this, use slightly bigger initial
delays then was passed to usleep_range().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 include/linux/iopoll.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/iopoll.h b/include/linux/iopoll.h
index 91324c331a4b..fca50f117fae 100644
--- a/include/linux/iopoll.h
+++ b/include/linux/iopoll.h
@@ -41,7 +41,7 @@
 	ktime_t __timeout = ktime_add_us(ktime_get(), __timeout_us); \
 	might_sleep_if((__sleep_us) != 0); \
 	if (sleep_before_read && __sleep_us) \
-		usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
+		fsleep((__sleep_us >> 1) + 1); \
 	for (;;) { \
 		(val) = op(args); \
 		if (cond) \
@@ -52,7 +52,7 @@
 			break; \
 		} \
 		if (__sleep_us) \
-			usleep_range((__sleep_us >> 2) + 1, __sleep_us); \
+			fsleep((__sleep_us >> 1) + 1); \
 		cpu_relax(); \
 	} \
 	(cond) ? 0 : -ETIMEDOUT; \
-- 
2.47.2