Release 4.15 include/linux/delay.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_DELAY_H

#define _LINUX_DELAY_H

/*
 * Copyright (C) 1993 Linus Torvalds
 *
 * Delay routines, using a pre-computed "loops_per_jiffy" value.
 *
 * Please note that ndelay(), udelay() and mdelay() may return early for
 * several reasons:
 *  1. computed loops_per_jiffy too low (due to the time taken to
 *     execute the timer interrupt.)
 *  2. cache behaviour affecting the time it takes to execute the
 *     loop function.
 *  3. CPU clock rate changes.
 *
 * Please see this thread:
 *   http://lists.openwall.net/linux-kernel/2011/01/09/56
 */

#include <linux/kernel.h>

extern unsigned long loops_per_jiffy;

#include <asm/delay.h>

/*
 * Using udelay() for intervals greater than a few milliseconds can
 * risk overflow for high loops_per_jiffy (high bogomips) machines. The
 * mdelay() provides a wrapper to prevent this.  For delays greater
 * than MAX_UDELAY_MS milliseconds, the wrapper is used.  Architecture
 * specific values can be defined in asm-???/delay.h as an override.
 * The 2nd mdelay() definition ensures GCC will optimize away the 
 * while loop for the common cases where n <= MAX_UDELAY_MS  --  Paul G.
 */

#ifndef MAX_UDELAY_MS

#define MAX_UDELAY_MS	5
#endif

#ifndef mdelay

#define mdelay(n) (\
        (__builtin_constant_p(n) && (n)<=MAX_UDELAY_MS) ? udelay((n)*1000) : \
        ({unsigned long __ms=(n); while (__ms--) udelay(1000);}))
#endif

#ifndef ndelay


static inline void ndelay(unsigned long x)
{
	udelay(DIV_ROUND_UP(x, 1000));
}
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#define ndelay(x) ndelay(x)
#endif

extern unsigned long lpj_fine;
void calibrate_delay(void);
void msleep(unsigned int msecs);
unsigned long msleep_interruptible(unsigned int msecs);
void usleep_range(unsigned long min, unsigned long max);



static inline void ssleep(unsigned int seconds)
{
	msleep(seconds * 1000);
}

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#endif /* defined(_LINUX_DELAY_H) */
Overall Contributors
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Linus Torvalds (pre-git)
36
26.67%
5
27.78%
Andrew Morton
25
18.52%
1
5.56%
Jeff Garzik
18
13.33%
1
5.56%
Patrick Pannuto
12
8.89%
1
5.56%
Linus Torvalds
11
8.15%
1
5.56%
Greg Kroah-Hartman
9
6.67%
2
11.11%
Maximilian Attems
9
6.67%
1
5.56%
David Howells
6
4.44%
1
5.56%
Alok N Kataria
5
3.70%
2
11.11%
Anton Blanchard
2
1.48%
1
5.56%
Benjamin Herrenschmidt
1
0.74%
1
5.56%
Russell King
1
0.74%
1
5.56%
Total
135
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18
100.00%
Directory: include/linux

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