[PATCH 25/47] headers: Add time_after32()

The function time_after32() was added in kernel 4.14 and is now used by
the mt76 driver.
The code was copied from the upstream kernel.

Signed-off-by: Hauke Mehrtens <[email protected]>
---
 backport/backport-include/linux/time.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/backport/backport-include/linux/time.h b/backport/backport-include/linux/time.h
index ce8a1b03..712881db 100644
--- a/backport/backport-include/linux/time.h
+++ b/backport/backport-include/linux/time.h
@@ -12,4 +12,21 @@ static inline void time64_to_tm(time64_t totalsecs, int offset,
 }
 #endif
 
+#ifndef time_after32
+/**
+ * time_after32 - compare two 32-bit relative times
+ * @a:	the time which may be after @b
+ * @b:	the time which may be before @a
+ *
+ * time_after32(a, b) returns true if the time @a is after time @b.
+ * time_before32(b, a) returns true if the time @b is before time @a.
+ *
+ * Similar to time_after(), compare two 32-bit timestamps for relative
+ * times.  This is useful for comparing 32-bit seconds values that can't
+ * be converted to 64-bit values (e.g. due to disk format or wire protocol
+ * issues) when it is known that the times are less than 68 years apart.
+ */
+#define time_after32(a, b)	((s32)((u32)(b) - (u32)(a)) < 0)
+#endif
+
 #endif /* __BACKPORT_LINUX_TIME_H */
-- 
2.30.2

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