cregit-Linux how code gets into the kernel

Release 4.7 include/linux/time64.h

Directory: include/linux
#ifndef _LINUX_TIME64_H

#define _LINUX_TIME64_H

#include <uapi/linux/time.h>
#include <linux/math64.h>


typedef __s64 time64_t;

/*
 * This wants to go into uapi/linux/time.h once we agreed about the
 * userspace interfaces.
 */
#if __BITS_PER_LONG == 64

# define timespec64 timespec

#define itimerspec64 itimerspec
#else

struct timespec64 {
	
time64_t	tv_sec;			/* seconds */
	
long		tv_nsec;		/* nanoseconds */
};


struct itimerspec64 {
	
struct timespec64 it_interval;
	
struct timespec64 it_value;
};

#endif

/* Parameters used to convert the timespec values: */

#define MSEC_PER_SEC	1000L

#define USEC_PER_MSEC	1000L

#define NSEC_PER_USEC	1000L

#define NSEC_PER_MSEC	1000000L

#define USEC_PER_SEC	1000000L

#define NSEC_PER_SEC	1000000000L

#define FSEC_PER_SEC	1000000000000000LL

/* Located here for timespec[64]_valid_strict */

#define TIME64_MAX			((s64)~((u64)1 << 63))

#define KTIME_MAX			((s64)~((u64)1 << 63))

#define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)

#if __BITS_PER_LONG == 64


static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) { return ts64; }

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static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) { return ts; }

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static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) { return *its64; }

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static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) { return *its; }

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# define timespec64_equal timespec_equal # define timespec64_compare timespec_compare # define set_normalized_timespec64 set_normalized_timespec # define timespec64_add timespec_add # define timespec64_sub timespec_sub # define timespec64_valid timespec_valid # define timespec64_valid_strict timespec_valid_strict # define timespec64_to_ns timespec_to_ns # define ns_to_timespec64 ns_to_timespec # define timespec64_add_ns timespec_add_ns #else
static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) { struct timespec ret; ret.tv_sec = (time_t)ts64.tv_sec; ret.tv_nsec = ts64.tv_nsec; return ret; }

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static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) { struct timespec64 ret; ret.tv_sec = ts.tv_sec; ret.tv_nsec = ts.tv_nsec; return ret; }

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static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64) { struct itimerspec ret; ret.it_interval = timespec64_to_timespec(its64->it_interval); ret.it_value = timespec64_to_timespec(its64->it_value); return ret; }

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static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its) { struct itimerspec64 ret; ret.it_interval = timespec_to_timespec64(its->it_interval); ret.it_value = timespec_to_timespec64(its->it_value); return ret; }

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static inline int timespec64_equal(const struct timespec64 *a, const struct timespec64 *b) { return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); }

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/* * lhs < rhs: return <0 * lhs == rhs: return 0 * lhs > rhs: return >0 */
static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) { if (lhs->tv_sec < rhs->tv_sec) return -1; if (lhs->tv_sec > rhs->tv_sec) return 1; return lhs->tv_nsec - rhs->tv_nsec; }

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extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
static inline struct timespec64 timespec64_add(struct timespec64 lhs, struct timespec64 rhs) { struct timespec64 ts_delta; set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, lhs.tv_nsec + rhs.tv_nsec); return ts_delta; }

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/* * sub = lhs - rhs, in normalized form */
static inline struct timespec64 timespec64_sub(struct timespec64 lhs, struct timespec64 rhs) { struct timespec64 ts_delta; set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, lhs.tv_nsec - rhs.tv_nsec); return ts_delta; }

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/* * Returns true if the timespec64 is norm, false if denorm: */
static inline bool timespec64_valid(const struct timespec64 *ts) { /* Dates before 1970 are bogus */ if (ts->tv_sec < 0) return false; /* Can't have more nanoseconds then a second */ if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) return false; return true; }

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static inline bool timespec64_valid_strict(const struct timespec64 *ts) { if (!timespec64_valid(ts)) return false; /* Disallow values that could overflow ktime_t */ if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) return false; return true; }

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/** * timespec64_to_ns - Convert timespec64 to nanoseconds * @ts: pointer to the timespec64 variable to be converted * * Returns the scalar nanosecond representation of the timespec64 * parameter. */
static inline s64 timespec64_to_ns(const struct timespec64 *ts) { return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; }

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/** * ns_to_timespec64 - Convert nanoseconds to timespec64 * @nsec: the nanoseconds value to be converted * * Returns the timespec64 representation of the nsec parameter. */ extern struct timespec64 ns_to_timespec64(const s64 nsec); /** * timespec64_add_ns - Adds nanoseconds to a timespec64 * @a: pointer to timespec64 to be incremented * @ns: unsigned nanoseconds value to be added * * This must always be inlined because its used from the x86-64 vdso, * which cannot call other kernel functions. */
static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) { a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); a->tv_nsec = ns; }

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#endif /* * timespec64_add_safe assumes both values are positive and checks for * overflow. It will return TIME64_MAX in case of overflow. */ extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, const struct timespec64 rhs); #endif /* _LINUX_TIME64_H */

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Directory: include/linux
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