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Add some functions to jiffies.h.

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Also add some checks for overflow to existing functions.

Reviewed by:	hselasky
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D11533
This commit is contained in:
Mark Johnston 2017-07-13 18:27:22 +00:00
parent d03ae351ed
commit 8d92040b75
1 changed files with 47 additions and 10 deletions
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57
sys/compat/linuxkpi/common/include/linux/jiffies.h
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@ -68,11 +68,14 @@ timespec_to_jiffies(const struct timespec *ts)
} }
static inline int static inline int
msecs_to_jiffies(const u64 msec) msecs_to_jiffies(uint64_t msec)
{ {
u64 result; uint64_t msec_max, result;
result = howmany(msec * (u64)hz, 1000ULL); msec_max = -1ULL / (uint64_t)hz;
if (msec > msec_max)
msec = msec_max;
result = howmany(msec * (uint64_t)hz, 1000ULL);
if (result > MAX_JIFFY_OFFSET) if (result > MAX_JIFFY_OFFSET)
result = MAX_JIFFY_OFFSET; result = MAX_JIFFY_OFFSET;
@ -80,27 +83,61 @@ msecs_to_jiffies(const u64 msec)
} }
static inline int static inline int
usecs_to_jiffies(const u64 u) usecs_to_jiffies(uint64_t usec)
{ {
u64 result; uint64_t usec_max, result;
result = howmany(u * (u64)hz, 1000000ULL); usec_max = -1ULL / (uint64_t)hz;
if (usec > usec_max)
usec = usec_max;
result = howmany(usec * (uint64_t)hz, 1000000ULL);
if (result > MAX_JIFFY_OFFSET) if (result > MAX_JIFFY_OFFSET)
result = MAX_JIFFY_OFFSET; result = MAX_JIFFY_OFFSET;
return ((int)result); return ((int)result);
} }
static inline u64 static inline uint64_t
nsecs_to_jiffies(const u64 n) nsecs_to_jiffies64(uint64_t nsec)
{ {
uint64_t nsec_max, result;
nsec_max = -1ULL / (uint64_t)hz;
if (nsec > nsec_max)
nsec = nsec_max;
result = howmany(nsec * (uint64_t)hz, 1000000000ULL);
if (result > MAX_JIFFY_OFFSET)
result = MAX_JIFFY_OFFSET;
return (result);
}
static inline uint64_t
nsecs_to_jiffies(uint64_t n)
{
return (usecs_to_jiffies(howmany(n, 1000ULL))); return (usecs_to_jiffies(howmany(n, 1000ULL)));
} }
static inline u64 static inline uint64_t
jiffies_to_nsecs(int j)
{
return ((1000000000ULL / hz) * (uint64_t)(unsigned int)j);
}
static inline uint64_t
jiffies_to_usecs(int j)
{
return ((1000000ULL / hz) * (uint64_t)(unsigned int)j);
}
static inline uint64_t
get_jiffies_64(void) get_jiffies_64(void)
{ {
return ((u64)(unsigned)ticks);
return ((uint64_t)(unsigned int)ticks);
} }
static inline int static inline int