1 files changed, 102 insertions, 0 deletions
diff --git a/backport-include/linux/timekeeping.h b/backport-include/linux/timekeeping.h
new file mode 100644
index 0000000..571c602
--- /dev/null
+++ b/backport-include/linux/timekeeping.h
@@ -0,0 +1,102 @@
+#ifndef __BACKPORT_TIMEKEEPING_H
+#define __BACKPORT_TIMEKEEPING_H
+#include <linux/version.h>
+#include <linux/types.h>
+
+#if LINUX_VERSION_IS_GEQ(3,17,0)
+#include_next <linux/timekeeping.h>
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,17,0)
+#if BITS_PER_LONG < 64
+extern u64 ktime_divns(const ktime_t kt, s64 div);
+#else /* BITS_PER_LONG < 64 */
+# define ktime_divns(kt, div)	(u64)((kt).tv64 / (div))
+#endif
+#define ktime_get_ns LINUX_BACKPORT(ktime_get_ns)
+extern ktime_t ktime_get(void);
+#define ktime_get_ns LINUX_BACKPORT(ktime_get_ns)
+static inline u64 ktime_get_ns(void)
+{
+	return ktime_to_ns(ktime_get());
+}
+
+extern ktime_t ktime_get_boottime(void);
+#define ktime_get_boot_ns LINUX_BACKPORT(ktime_get_boot_ns)
+static inline u64 ktime_get_boot_ns(void)
+{
+	return ktime_to_ns(ktime_get_boottime());
+}
+#endif /* < 3.17 */
+
+#if LINUX_VERSION_IS_LESS(4,18,0)
+#if LINUX_VERSION_IS_GEQ(3,4,0)
+extern time64_t ktime_get_boottime_seconds(void);
+#endif
+#endif /* < 4.18 */
+
+#if LINUX_VERSION_IS_LESS(3,19,0)
+static inline time64_t ktime_get_seconds(void)
+{
+	struct timespec t;
+
+	ktime_get_ts(&t);
+
+	return t.tv_sec;
+}
+
+static inline time64_t ktime_get_real_seconds(void)
+{
+	struct timeval tv;
+
+	do_gettimeofday(&tv);
+
+	return tv.tv_sec;
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,17,0)
+static inline void ktime_get_ts64(struct timespec64 *ts)
+{
+	ktime_get_ts(ts);
+}
+#endif
+
+#if LINUX_VERSION_IS_LESS(3,17,0)
+/* This was introduced in 4.15, but we only need it in the
+ * ktime_get_raw_ts64 backport() for < 3.17.
+ */
+#if __BITS_PER_LONG == 64
+static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
+{
+	return *(const struct timespec64 *)&ts;
+}
+
+#else
+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;
+}
+#endif
+#endif /* < 3.17 */
+
+#if LINUX_VERSION_IS_LESS(4,18,0)
+#define ktime_get_raw_ts64 LINUX_BACKPORT(ktime_get_raw_ts64)
+static inline void ktime_get_raw_ts64(struct timespec64 *ts)
+{
+#if LINUX_VERSION_IS_LESS(3,19,0)
+	struct timespec64 ts64;
+
+	getrawmonotonic(&ts64);
+	*ts = timespec_to_timespec64(ts64);
+#else
+	return getrawmonotonic64(ts);
+#endif /* < 3.19 */
+}
+#endif
+
+#endif /* __BACKPORT_TIMEKEEPING_H */