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-rw-r--r--include/linux/ktime.h68
1 files changed, 23 insertions, 45 deletions
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 0fb7ffb1775f..8e573deda55e 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -24,21 +24,8 @@
#include <linux/time.h>
#include <linux/jiffies.h>
-/*
- * ktime_t:
- *
- * A single 64-bit variable is used to store the hrtimers
- * internal representation of time values in scalar nanoseconds. The
- * design plays out best on 64-bit CPUs, where most conversions are
- * NOPs and most arithmetic ktime_t operations are plain arithmetic
- * operations.
- *
- */
-union ktime {
- s64 tv64;
-};
-
-typedef union ktime ktime_t; /* Kill this */
+/* Nanosecond scalar representation for kernel time values */
+typedef s64 ktime_t;
/**
* ktime_set - Set a ktime_t variable from a seconds/nanoseconds value
@@ -50,39 +37,34 @@ typedef union ktime ktime_t; /* Kill this */
static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs)
{
if (unlikely(secs >= KTIME_SEC_MAX))
- return (ktime_t){ .tv64 = KTIME_MAX };
+ return KTIME_MAX;
- return (ktime_t) { .tv64 = secs * NSEC_PER_SEC + (s64)nsecs };
+ return secs * NSEC_PER_SEC + (s64)nsecs;
}
/* Subtract two ktime_t variables. rem = lhs -rhs: */
-#define ktime_sub(lhs, rhs) \
- ({ (ktime_t){ .tv64 = (lhs).tv64 - (rhs).tv64 }; })
+#define ktime_sub(lhs, rhs) ((lhs) - (rhs))
/* Add two ktime_t variables. res = lhs + rhs: */
-#define ktime_add(lhs, rhs) \
- ({ (ktime_t){ .tv64 = (lhs).tv64 + (rhs).tv64 }; })
+#define ktime_add(lhs, rhs) ((lhs) + (rhs))
/*
* Same as ktime_add(), but avoids undefined behaviour on overflow; however,
* this means that you must check the result for overflow yourself.
*/
-#define ktime_add_unsafe(lhs, rhs) \
- ({ (ktime_t){ .tv64 = (u64) (lhs).tv64 + (rhs).tv64 }; })
+#define ktime_add_unsafe(lhs, rhs) ((u64) (lhs) + (rhs))
/*
* Add a ktime_t variable and a scalar nanosecond value.
* res = kt + nsval:
*/
-#define ktime_add_ns(kt, nsval) \
- ({ (ktime_t){ .tv64 = (kt).tv64 + (nsval) }; })
+#define ktime_add_ns(kt, nsval) ((kt) + (nsval))
/*
* Subtract a scalar nanosecod from a ktime_t variable
* res = kt - nsval:
*/
-#define ktime_sub_ns(kt, nsval) \
- ({ (ktime_t){ .tv64 = (kt).tv64 - (nsval) }; })
+#define ktime_sub_ns(kt, nsval) ((kt) - (nsval))
/* convert a timespec to ktime_t format: */
static inline ktime_t timespec_to_ktime(struct timespec ts)
@@ -103,16 +85,16 @@ static inline ktime_t timeval_to_ktime(struct timeval tv)
}
/* Map the ktime_t to timespec conversion to ns_to_timespec function */
-#define ktime_to_timespec(kt) ns_to_timespec((kt).tv64)
+#define ktime_to_timespec(kt) ns_to_timespec((kt))
/* Map the ktime_t to timespec conversion to ns_to_timespec function */
-#define ktime_to_timespec64(kt) ns_to_timespec64((kt).tv64)
+#define ktime_to_timespec64(kt) ns_to_timespec64((kt))
/* Map the ktime_t to timeval conversion to ns_to_timeval function */
-#define ktime_to_timeval(kt) ns_to_timeval((kt).tv64)
+#define ktime_to_timeval(kt) ns_to_timeval((kt))
/* Convert ktime_t to nanoseconds - NOP in the scalar storage format: */
-#define ktime_to_ns(kt) ((kt).tv64)
+#define ktime_to_ns(kt) (kt)
/**
@@ -126,7 +108,7 @@ static inline ktime_t timeval_to_ktime(struct timeval tv)
*/
static inline int ktime_equal(const ktime_t cmp1, const ktime_t cmp2)
{
- return cmp1.tv64 == cmp2.tv64;
+ return cmp1 == cmp2;
}
/**
@@ -141,9 +123,9 @@ static inline int ktime_equal(const ktime_t cmp1, const ktime_t cmp2)
*/
static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
{
- if (cmp1.tv64 < cmp2.tv64)
+ if (cmp1 < cmp2)
return -1;
- if (cmp1.tv64 > cmp2.tv64)
+ if (cmp1 > cmp2)
return 1;
return 0;
}
@@ -182,7 +164,7 @@ static inline s64 ktime_divns(const ktime_t kt, s64 div)
*/
BUG_ON(div < 0);
if (__builtin_constant_p(div) && !(div >> 32)) {
- s64 ns = kt.tv64;
+ s64 ns = kt;
u64 tmp = ns < 0 ? -ns : ns;
do_div(tmp, div);
@@ -199,7 +181,7 @@ static inline s64 ktime_divns(const ktime_t kt, s64 div)
* so catch them on 64bit as well.
*/
WARN_ON(div < 0);
- return kt.tv64 / div;
+ return kt / div;
}
#endif
@@ -256,7 +238,7 @@ extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
static inline __must_check bool ktime_to_timespec_cond(const ktime_t kt,
struct timespec *ts)
{
- if (kt.tv64) {
+ if (kt) {
*ts = ktime_to_timespec(kt);
return true;
} else {
@@ -275,7 +257,7 @@ static inline __must_check bool ktime_to_timespec_cond(const ktime_t kt,
static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
struct timespec64 *ts)
{
- if (kt.tv64) {
+ if (kt) {
*ts = ktime_to_timespec64(kt);
return true;
} else {
@@ -290,20 +272,16 @@ static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
* this resolution values.
*/
#define LOW_RES_NSEC TICK_NSEC
-#define KTIME_LOW_RES (ktime_t){ .tv64 = LOW_RES_NSEC }
+#define KTIME_LOW_RES (LOW_RES_NSEC)
static inline ktime_t ns_to_ktime(u64 ns)
{
- static const ktime_t ktime_zero = { .tv64 = 0 };
-
- return ktime_add_ns(ktime_zero, ns);
+ return ns;
}
static inline ktime_t ms_to_ktime(u64 ms)
{
- static const ktime_t ktime_zero = { .tv64 = 0 };
-
- return ktime_add_ms(ktime_zero, ms);
+ return ms * NSEC_PER_MSEC;
}
# include <linux/timekeeping.h>