2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #ifndef _LINUX_JIFFIES_H_
32 #define _LINUX_JIFFIES_H_
34 #include <linux/types.h>
35 #include <linux/kernel.h>
36 #include <linux/time.h>
39 #include <sys/kernel.h>
40 #include <sys/limits.h>
43 msecs_to_jiffies(int msec)
47 tv.tv_sec = msec / 1000;
48 tv.tv_usec = (msec % 1000) * 1000;
49 return (tvtohz(&tv) - 1);
53 #define jiffies_64 ticks
54 #define jiffies_to_msecs(x) (((int64_t)(x)) * 1000 / hz)
56 #define MAX_JIFFY_OFFSET ((INT_MAX >> 1) - 1)
58 #define time_after(a, b) ((int)((b) - (a)) < 0)
59 #define time_before(a, b) time_after(b,a)
60 #define time_after_eq(a, b) ((int)((a) - (b)) >= 0)
61 #define time_before_eq(a, b) time_after_eq(b, a)
62 #define time_in_range(a,b,c) \
63 (time_after_eq(a,b) && time_before_eq(a,c))
68 timespec_to_jiffies(const struct timespec *ts)
72 result = ((u64)hz * ts->tv_sec) +
73 (((u64)hz * ts->tv_nsec + NSEC_PER_SEC - 1) / NSEC_PER_SEC);
74 if (result > MAX_JIFFY_OFFSET)
75 result = MAX_JIFFY_OFFSET;
81 usecs_to_jiffies(const unsigned int u)
85 result = ((u64)u * hz + 1000000 - 1) / 1000000;
86 if (result > MAX_JIFFY_OFFSET)
87 result = MAX_JIFFY_OFFSET;
95 return ((u64)(unsigned)ticks);
98 #endif /* _LINUX_JIFFIES_H_ */