[PATCH 2/5] backports: add mktime64()

[Johannes Berg <johannes@sipsolutions.net>]

From: Johannes Berg <johannes.berg@intel.com>

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
 backport/backport-include/linux/time64.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/backport/backport-include/linux/time64.h b/backport/backport-include/linux/time64.h
index 609b8904e40d..49805da9dfce 100644
--- a/backport/backport-include/linux/time64.h
+++ b/backport/backport-include/linux/time64.h
@@ -21,4 +21,26 @@
 #define timespec64			timespec
 #endif /* LINUX_VERSION_IS_LESS(3,17,0) */
 
+#if LINUX_VERSION_IS_LESS(3,19,0)
+static inline time64_t mktime64(const unsigned int year0, const unsigned int mon0,
+				const unsigned int day, const unsigned int hour,
+				const unsigned int min, const unsigned int sec)
+{
+	unsigned int mon = mon0, year = year0;
+
+	/* 1..12 -> 11,12,1..10 */
+	if (0 >= (int) (mon -= 2)) {
+		mon += 12;	/* Puts Feb last since it has leap day */
+		year -= 1;
+	}
+
+	return ((((time64_t)
+		  (year/4 - year/100 + year/400 + 367*mon/12 + day) +
+		  year*365 - 719499
+	    )*24 + hour /* now have hours - midnight tomorrow handled here */
+	  )*60 + min /* now have minutes */
+	)*60 + sec; /* finally seconds */
+}
+#endif
+
 #endif /* __BACKPORT_LINUX_TIME64_H */
-- 
2.14.2

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