Add a timespec style comparison function. Allows two ktime types to be compared
without having to convert to timespec/timeval. Useful for modules doing ktime
based math, especially the ones using ktime_get heavily.
Signed-off-by: Abhishek Sagar <[email protected]>
---
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index a6ddec1..7f9d321 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -95,6 +95,23 @@ static inline ktime_t ktime_set(const long secs, const unsigned long nsecs)
#define ktime_add(lhs, rhs) \
({ (ktime_t){ .tv64 = (lhs).tv64 + (rhs).tv64 }; })
+/**
+ * ktime_compare - Compares two ktime_t variables
+ *
+ * Return val:
+ * lhs < rhs: < 0
+ * lhs == rhs: 0
+ * lhs > rhs: > 0
+ */
+static inline int ktime_compare(const ktime_t lhs, const ktime_t rhs)
+{
+ if (lhs.tv64 < rhs.tv64)
+ return -1;
+ if (lhs.tv64 > rhs.tv64)
+ return 1;
+ return 0;
+}
+
/*
* Add a ktime_t variable and a scalar nanosecond value.
* res = kt + nsval:
@@ -198,6 +215,23 @@ static inline ktime_t ktime_add(const ktime_t add1, const ktime_t add2)
}
/**
+ * ktime_compare - Compares two ktime_t variables
+ *
+ * Return val:
+ * lhs < rhs: < 0
+ * lhs == rhs: 0
+ * lhs > rhs: > 0
+ */
+static inline int ktime_compare(const ktime_t lhs, const ktime_t rhs)
+{
+ if (lhs.tv.sec < rhs.tv.sec)
+ return -1;
+ if (lhs.tv.sec > rhs.tv.sec)
+ return 1;
+ return lhs.tv.nsec - rhs.tv.nsec;
+}
+
+/**
* ktime_add_ns - Add a scalar nanoseconds value to a ktime_t variable
* @kt: addend
* @nsec: the scalar nsec value to add