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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/include/linux/delay.h
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@@ -16,10 +16,11 @@
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  *  3. CPU clock rate changes.
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  *
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  * Please see this thread:
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- *   http://lists.openwall.net/linux-kernel/2011/01/09/56
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+ *   https://lists.openwall.net/linux-kernel/2011/01/09/56
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  */
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 #include <linux/kernel.h>
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+#include <linux/sched.h>
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 extern unsigned long loops_per_jiffy;
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..
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@@ -55,16 +56,35 @@
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 extern unsigned long lpj_fine;
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 void calibrate_delay(void);
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+void __attribute__((weak)) calibration_delay_done(void);
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 void msleep(unsigned int msecs);
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 unsigned long msleep_interruptible(unsigned int msecs);
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+void usleep_range_state(unsigned long min, unsigned long max,
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+			unsigned int state);
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 void usleep_range(unsigned long min, unsigned long max);
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+
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+static inline void usleep_idle_range(unsigned long min, unsigned long max)
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+{
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+	usleep_range_state(min, max, TASK_IDLE);
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+}
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 static inline void ssleep(unsigned int seconds)
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 {
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 	msleep(seconds * 1000);
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 }
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-#ifdef CONFIG_PREEMPT_RT_FULL
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+/* see Documentation/timers/timers-howto.rst for the thresholds */
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+static inline void fsleep(unsigned long usecs)
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+{
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+	if (usecs <= 10)
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+		udelay(usecs);
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+	else if (usecs <= 20000)
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+		usleep_range(usecs, 2 * usecs);
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+	else
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+		msleep(DIV_ROUND_UP(usecs, 1000));
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+}
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+
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+#ifdef CONFIG_PREEMPT_RT
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 extern void cpu_chill(void);
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 #else
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 # define cpu_chill()	cpu_relax()