[PATCH v3] backports: add ktime_get_boot_ns()

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From: Johannes Berg <johannes.berg@xxxxxxxxx>

This small helper inline was added in 3.17, we want to use it now
so need to backport it.

Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
 backport/backport-include/linux/timekeeping.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/backport/backport-include/linux/timekeeping.h b/backport/backport-include/linux/timekeeping.h
index fe42e7170680..db90a0a139b5 100644
--- a/backport/backport-include/linux/timekeeping.h
+++ b/backport/backport-include/linux/timekeeping.h
@@ -15,6 +15,12 @@ static inline u64 ktime_get_ns(void)
 {
 	return ktime_to_ns(ktime_get());
 }
+
+extern ktime_t ktime_get_boottime(void);
+static inline u64 ktime_get_boot_ns(void)
+{
+	return ktime_to_ns(ktime_get_boottime());
+}
 #endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,19,0)
-- 
2.6.2

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