Two new functions: jiffies_to_ktime() and ktime_to_jiffies(), we'll use
them for timerfd deferred timers handling.
We fully reuse the logic from timespec implementations, so the functions
are pretty straightforward.
The only tricky part is in headers: we have to include jiffies.h after
we defined ktime_t, this is because ktime.h needs some declarations from
jiffies.h (e.g. TICK_NSEC).
Signed-off-by: Anton Vorontsov <anton.voront...@linaro.org>
---
include/linux/jiffies.h | 3 +++
include/linux/ktime.h | 3 ++-
kernel/time.c | 23 +++++++++++++++++++++++
3 files changed, 28 insertions(+), 1 deletion(-)
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index 265e2c3..4451241 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -6,6 +6,7 @@
#include <linux/types.h>
#include <linux/time.h>
#include <linux/timex.h>
+#include <linux/ktime.h>
#include <asm/param.h> /* for HZ */
/*
@@ -303,6 +304,8 @@ extern void jiffies_to_timespec(const unsigned long jiffies,
extern unsigned long timeval_to_jiffies(const struct timeval *value);
extern void jiffies_to_timeval(const unsigned long jiffies,
struct timeval *value);
+extern unsigned long ktime_to_jiffies(ktime_t *value);
+extern void jiffies_to_ktime(const unsigned long jiffies, ktime_t *value);
extern clock_t jiffies_to_clock_t(unsigned long x);
extern unsigned long clock_t_to_jiffies(unsigned long x);
extern u64 jiffies_64_to_clock_t(u64 x);
diff --git a/include/linux/ktime.h b/include/linux/ktime.h
index 603bec2..9551856 100644
--- a/include/linux/ktime.h
+++ b/include/linux/ktime.h
@@ -22,7 +22,6 @@
#define _LINUX_KTIME_H
#include <linux/time.h>
-#include <linux/jiffies.h>
/*
* ktime_t:
@@ -58,6 +57,8 @@ union ktime {
typedef union ktime ktime_t; /* Kill this */
+#include <linux/jiffies.h>
+
#define KTIME_MAX ((s64)~((u64)1 << 63))
#if (BITS_PER_LONG == 64)
# define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
diff --git a/kernel/time.c b/kernel/time.c
index ba744cf..82c06c5 100644
--- a/kernel/time.c
+++ b/kernel/time.c
@@ -29,6 +29,7 @@
#include <linux/export.h>
#include <linux/timex.h>
+#include <linux/ktime.h>
#include <linux/capability.h>
#include <linux/clocksource.h>
#include <linux/errno.h>
@@ -566,6 +567,28 @@ void jiffies_to_timeval(const unsigned long jiffies,
struct timeval *value)
}
EXPORT_SYMBOL(jiffies_to_timeval);
+unsigned long ktime_to_jiffies(ktime_t *value)
+{
+ struct timespec ts = ktime_to_timespec(*value);
+
+ /*
+ * nsecs_to_jiffies(ktime_to_ns(*ktime)) is unsafe as nsecs_to_jiffies
+ * doesn't handle MAX_JIFFY_OFFSET. So we reuse the logic from the
+ * timespec to jiffies conversion function.
+ */
+ return timespec_to_jiffies(&ts);
+}
+EXPORT_SYMBOL(ktime_to_jiffies);
+
+void jiffies_to_ktime(const unsigned long jiffies, ktime_t *value)
+{
+ struct timespec ts;
+
+ jiffies_to_timespec(jiffies, &ts);
+ *value = timespec_to_ktime(ts);
+}
+EXPORT_SYMBOL(jiffies_to_ktime);
+
/*
* Convert jiffies/jiffies_64 to clock_t and back.
*/
--
1.7.11.5
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