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Implement nsecs_to_jiffies() in the LinuxKPI and while at it

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streamline the rest of the xxx_to_jiffies() functions to have a
constant 64-bit argument and use identical range checks for the
result.

Specifically preserve msecs_to_jiffies(0) returning 0. See r282743 for
further details.

MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
hselasky 2016-05-13 11:02:02 +00:00
parent 8306bbe5e9
commit c4e3a7ca23
1 changed files with 21 additions and 13 deletions
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34
sys/compat/linuxkpi/common/include/linux/jiffies.h
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@ -2,7 +2,7 @@
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, Inc.
* Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
* Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -39,16 +39,6 @@
#include <sys/kernel.h>
#include <sys/limits.h>
static inline int
msecs_to_jiffies(int msec)
{
struct timeval tv;
tv.tv_sec = msec / 1000;
tv.tv_usec = (msec % 1000) * 1000;
return (tvtohz(&tv) - 1);
}
#define jiffies ticks
#define jiffies_64 ticks
#define jiffies_to_msecs(x) (((int64_t)(x)) * 1000 / hz)
@ -78,17 +68,35 @@ timespec_to_jiffies(const struct timespec *ts)
}
static inline int
usecs_to_jiffies(const unsigned int u)
msecs_to_jiffies(const u64 msec)
{
u64 result;
result = ((u64)u * hz + 1000000 - 1) / 1000000;
result = howmany(msec * (u64)hz, 1000ULL);
if (result > MAX_JIFFY_OFFSET)
result = MAX_JIFFY_OFFSET;
return ((int)result);
}
static inline int
usecs_to_jiffies(const u64 u)
{
u64 result;
result = howmany(u * (u64)hz, 1000000ULL);
if (result > MAX_JIFFY_OFFSET)
result = MAX_JIFFY_OFFSET;
return ((int)result);
}
static inline u64
nsecs_to_jiffies(const u64 n)
{
return (usecs_to_jiffies(howmany(n, 1000ULL)));
}
static inline u64
get_jiffies_64(void)
{