v4.19.13 snapshot.
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
new file mode 100644
index 0000000..b2bb44f
--- /dev/null
+++ b/include/linux/ktime.h
@@ -0,0 +1,278 @@
+/*
+ * include/linux/ktime.h
+ *
+ * ktime_t - nanosecond-resolution time format.
+ *
+ * Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
+ * Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
+ *
+ * data type definitions, declarations, prototypes and macros.
+ *
+ * Started by: Thomas Gleixner and Ingo Molnar
+ *
+ * Credits:
+ *
+ * Roman Zippel provided the ideas and primary code snippets of
+ * the ktime_t union and further simplifications of the original
+ * code.
+ *
+ * For licencing details see kernel-base/COPYING
+ */
+#ifndef _LINUX_KTIME_H
+#define _LINUX_KTIME_H
+
+#include <linux/time.h>
+#include <linux/jiffies.h>
+
+/* Nanosecond scalar representation for kernel time values */
+typedef s64 ktime_t;
+
+/**
+ * ktime_set - Set a ktime_t variable from a seconds/nanoseconds value
+ * @secs: seconds to set
+ * @nsecs: nanoseconds to set
+ *
+ * Return: The ktime_t representation of the value.
+ */
+static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs)
+{
+ if (unlikely(secs >= KTIME_SEC_MAX))
+ return KTIME_MAX;
+
+ return secs * NSEC_PER_SEC + (s64)nsecs;
+}
+
+/* Subtract two ktime_t variables. rem = lhs -rhs: */
+#define ktime_sub(lhs, rhs) ((lhs) - (rhs))
+
+/* Add two ktime_t variables. res = lhs + rhs: */
+#define ktime_add(lhs, rhs) ((lhs) + (rhs))
+
+/*
+ * Same as ktime_add(), but avoids undefined behaviour on overflow; however,
+ * this means that you must check the result for overflow yourself.
+ */
+#define ktime_add_unsafe(lhs, rhs) ((u64) (lhs) + (rhs))
+
+/*
+ * Add a ktime_t variable and a scalar nanosecond value.
+ * res = kt + nsval:
+ */
+#define ktime_add_ns(kt, nsval) ((kt) + (nsval))
+
+/*
+ * Subtract a scalar nanosecod from a ktime_t variable
+ * res = kt - nsval:
+ */
+#define ktime_sub_ns(kt, nsval) ((kt) - (nsval))
+
+/* convert a timespec to ktime_t format: */
+static inline ktime_t timespec_to_ktime(struct timespec ts)
+{
+ return ktime_set(ts.tv_sec, ts.tv_nsec);
+}
+
+/* convert a timespec64 to ktime_t format: */
+static inline ktime_t timespec64_to_ktime(struct timespec64 ts)
+{
+ return ktime_set(ts.tv_sec, ts.tv_nsec);
+}
+
+/* convert a timeval to ktime_t format: */
+static inline ktime_t timeval_to_ktime(struct timeval tv)
+{
+ return ktime_set(tv.tv_sec, tv.tv_usec * NSEC_PER_USEC);
+}
+
+/* Map the ktime_t to timespec conversion to ns_to_timespec function */
+#define ktime_to_timespec(kt) ns_to_timespec((kt))
+
+/* Map the ktime_t to timespec conversion to ns_to_timespec function */
+#define ktime_to_timespec64(kt) ns_to_timespec64((kt))
+
+/* Map the ktime_t to timeval conversion to ns_to_timeval function */
+#define ktime_to_timeval(kt) ns_to_timeval((kt))
+
+/* Convert ktime_t to nanoseconds */
+static inline s64 ktime_to_ns(const ktime_t kt)
+{
+ return kt;
+}
+
+/**
+ * ktime_compare - Compares two ktime_t variables for less, greater or equal
+ * @cmp1: comparable1
+ * @cmp2: comparable2
+ *
+ * Return: ...
+ * cmp1 < cmp2: return <0
+ * cmp1 == cmp2: return 0
+ * cmp1 > cmp2: return >0
+ */
+static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
+{
+ if (cmp1 < cmp2)
+ return -1;
+ if (cmp1 > cmp2)
+ return 1;
+ return 0;
+}
+
+/**
+ * ktime_after - Compare if a ktime_t value is bigger than another one.
+ * @cmp1: comparable1
+ * @cmp2: comparable2
+ *
+ * Return: true if cmp1 happened after cmp2.
+ */
+static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)
+{
+ return ktime_compare(cmp1, cmp2) > 0;
+}
+
+/**
+ * ktime_before - Compare if a ktime_t value is smaller than another one.
+ * @cmp1: comparable1
+ * @cmp2: comparable2
+ *
+ * Return: true if cmp1 happened before cmp2.
+ */
+static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2)
+{
+ return ktime_compare(cmp1, cmp2) < 0;
+}
+
+#if BITS_PER_LONG < 64
+extern s64 __ktime_divns(const ktime_t kt, s64 div);
+static inline s64 ktime_divns(const ktime_t kt, s64 div)
+{
+ /*
+ * Negative divisors could cause an inf loop,
+ * so bug out here.
+ */
+ BUG_ON(div < 0);
+ if (__builtin_constant_p(div) && !(div >> 32)) {
+ s64 ns = kt;
+ u64 tmp = ns < 0 ? -ns : ns;
+
+ do_div(tmp, div);
+ return ns < 0 ? -tmp : tmp;
+ } else {
+ return __ktime_divns(kt, div);
+ }
+}
+#else /* BITS_PER_LONG < 64 */
+static inline s64 ktime_divns(const ktime_t kt, s64 div)
+{
+ /*
+ * 32-bit implementation cannot handle negative divisors,
+ * so catch them on 64bit as well.
+ */
+ WARN_ON(div < 0);
+ return kt / div;
+}
+#endif
+
+static inline s64 ktime_to_us(const ktime_t kt)
+{
+ return ktime_divns(kt, NSEC_PER_USEC);
+}
+
+static inline s64 ktime_to_ms(const ktime_t kt)
+{
+ return ktime_divns(kt, NSEC_PER_MSEC);
+}
+
+static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
+{
+ return ktime_to_us(ktime_sub(later, earlier));
+}
+
+static inline s64 ktime_ms_delta(const ktime_t later, const ktime_t earlier)
+{
+ return ktime_to_ms(ktime_sub(later, earlier));
+}
+
+static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
+{
+ return ktime_add_ns(kt, usec * NSEC_PER_USEC);
+}
+
+static inline ktime_t ktime_add_ms(const ktime_t kt, const u64 msec)
+{
+ return ktime_add_ns(kt, msec * NSEC_PER_MSEC);
+}
+
+static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
+{
+ return ktime_sub_ns(kt, usec * NSEC_PER_USEC);
+}
+
+static inline ktime_t ktime_sub_ms(const ktime_t kt, const u64 msec)
+{
+ return ktime_sub_ns(kt, msec * NSEC_PER_MSEC);
+}
+
+extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
+
+/**
+ * ktime_to_timespec_cond - convert a ktime_t variable to timespec
+ * format only if the variable contains data
+ * @kt: the ktime_t variable to convert
+ * @ts: the timespec variable to store the result in
+ *
+ * Return: %true if there was a successful conversion, %false if kt was 0.
+ */
+static inline __must_check bool ktime_to_timespec_cond(const ktime_t kt,
+ struct timespec *ts)
+{
+ if (kt) {
+ *ts = ktime_to_timespec(kt);
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/**
+ * ktime_to_timespec64_cond - convert a ktime_t variable to timespec64
+ * format only if the variable contains data
+ * @kt: the ktime_t variable to convert
+ * @ts: the timespec variable to store the result in
+ *
+ * Return: %true if there was a successful conversion, %false if kt was 0.
+ */
+static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
+ struct timespec64 *ts)
+{
+ if (kt) {
+ *ts = ktime_to_timespec64(kt);
+ return true;
+ } else {
+ return false;
+ }
+}
+
+/*
+ * The resolution of the clocks. The resolution value is returned in
+ * the clock_getres() system call to give application programmers an
+ * idea of the (in)accuracy of timers. Timer values are rounded up to
+ * this resolution values.
+ */
+#define LOW_RES_NSEC TICK_NSEC
+#define KTIME_LOW_RES (LOW_RES_NSEC)
+
+static inline ktime_t ns_to_ktime(u64 ns)
+{
+ return ns;
+}
+
+static inline ktime_t ms_to_ktime(u64 ms)
+{
+ return ms * NSEC_PER_MSEC;
+}
+
+# include <linux/timekeeping.h>
+# include <linux/timekeeping32.h>
+
+#endif