[PATCH 09/11] cputime:Introduce the cputime_to_timespec64/timespec64_to_cputime function

Baolin Wang
2015-04-20T05:57:37Z

This patch introduces some functions for converting cputime to timespec64 and back,
that repalce the timespec type with timespec64 type, as well as for arch/s390 and
arch/powerpc architecture.

And these new methods will replace the old cputime_to_timespec/timespec_to_cputime
function to ready for 2038 issue. The cputime_to_timespec/timespec_to_cputime functions
are moved to include/linux/cputime.h file for removing conveniently.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
arch/powerpc/include/asm/cputime.h | 6 +++---
arch/s390/include/asm/cputime.h | 8 ++++----
include/asm-generic/cputime_jiffies.h | 10 +++++-----
include/linux/cputime.h | 15 +++++++++++++++
include/linux/jiffies.h | 3 +++
kernel/time/time.c | 21 +++++++++++++++++++++
6 files changed, 51 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/include/asm/cputime.h b/arch/powerpc/include/asm/cputime.h
index e245255..5dda5c0 100644
--- a/arch/powerpc/include/asm/cputime.h
+++ b/arch/powerpc/include/asm/cputime.h
@@ -154,9 +154,9 @@ static inline cputime_t secs_to_cputime(const unsigned long sec)
}

/*
- * Convert cputime <-> timespec
+ * Convert cputime <-> timespec64
*/
-static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
+static inline void cputime_to_timespec64(const cputime_t ct, struct timespec64 *p)
{
u64 x = (__force u64) ct;
unsigned int frac;
@@ -168,7 +168,7 @@ static inline void cputime_to_timespec(const cputime_t ct, struct timespec *p)
p->tv_nsec = x;
}

-static inline cputime_t timespec_to_cputime(const struct timespec *p)
+static inline cputime_t timespec64_to_cputime(const struct timespec64 *p)
{
u64 ct;

diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h
index b91e960..1266697 100644
--- a/arch/s390/include/asm/cputime.h
+++ b/arch/s390/include/asm/cputime.h
@@ -89,16 +89,16 @@ static inline cputime_t secs_to_cputime(const unsigned int s)
}

/*
- * Convert cputime to timespec and back.
+ * Convert cputime to timespec64 and back.
*/
-static inline cputime_t timespec_to_cputime(const struct timespec *value)
+static inline cputime_t timespec64_to_cputime(const struct timespec64 *value)
{
unsigned long long ret = value->tv_sec * CPUTIME_PER_SEC;
return (__force cputime_t)(ret + __div(value->tv_nsec * CPUTIME_PER_USEC, NSEC_PER_USEC));
}

-static inline void cputime_to_timespec(const cputime_t cputime,
- struct timespec *value)
+static inline void cputime_to_timespec64(const cputime_t cputime,
+ struct timespec64 *value)
{
unsigned long long __cputime = (__force unsigned long long) cputime;
#ifndef CONFIG_64BIT
diff --git a/include/asm-generic/cputime_jiffies.h b/include/asm-generic/cputime_jiffies.h
index fe386fc..ec77c0b 100644
--- a/include/asm-generic/cputime_jiffies.h
+++ b/include/asm-generic/cputime_jiffies.h
@@ -44,12 +44,12 @@ typedef u64 __nocast cputime64_t;
#define secs_to_cputime(sec) jiffies_to_cputime((sec) * HZ)

/*
- * Convert cputime to timespec and back.
+ * Convert cputime to timespec64 and abck.
*/
-#define timespec_to_cputime(__val) \
- jiffies_to_cputime(timespec_to_jiffies(__val))
-#define cputime_to_timespec(__ct,__val) \
- jiffies_to_timespec(cputime_to_jiffies(__ct),__val)
+#define timespec64_to_cputime(__val) \
+ jiffies_to_cputime(timespec64_to_jiffies(__val))
+#define cputime_to_timespec64(__ct,__val) \
+ jiffies_to_timespec64(cputime_to_jiffies(__ct),__val)

/*
* Convert cputime to timeval and back.
diff --git a/include/linux/cputime.h b/include/linux/cputime.h
index f2eb2ee..f01896f 100644
--- a/include/linux/cputime.h
+++ b/include/linux/cputime.h
@@ -13,4 +13,19 @@
usecs_to_cputime((__nsecs) / NSEC_PER_USEC)
#endif

+static inline cputime_t timespec_to_cputime(const struct timespec *ts)
+{
+ struct timespec64 ts64 = timespec_to_timespec64(*ts);
+ return timespec64_to_cputime(&ts64);
+}
+
+static inline void cputime_to_timespec(const cputime_t cputime,
+ struct timespec *value)
+{
+ struct timespec64 *ts64;
+
+ *ts64 = timespec_to_timespec64(*value);
+ cputime_to_timespec64(cputime, ts64);
+}
+
#endif /* __LINUX_CPUTIME_H */
diff --git a/include/linux/jiffies.h b/include/linux/jiffies.h
index c367cbd..dbaa4ee 100644
--- a/include/linux/jiffies.h
+++ b/include/linux/jiffies.h
@@ -293,6 +293,9 @@ extern unsigned long usecs_to_jiffies(const unsigned int u);
extern unsigned long timespec_to_jiffies(const struct timespec *value);
extern void jiffies_to_timespec(const unsigned long jiffies,
struct timespec *value);
+extern unsigned long timespec64_to_jiffies(const struct timespec64 *value);
+extern void jiffies_to_timespec64(const unsigned long jiffies,
+ struct timespec64 *value);
extern unsigned long timeval_to_jiffies(const struct timeval *value);
extern void jiffies_to_timeval(const unsigned long jiffies,
struct timeval *value);
diff --git a/kernel/time/time.c b/kernel/time/time.c
index 2c85b77..d5978c5 100644
--- a/kernel/time/time.c
+++ b/kernel/time/time.c
@@ -606,6 +606,27 @@ jiffies_to_timespec(const unsigned long jiffies, struct timespec *value)
}
EXPORT_SYMBOL(jiffies_to_timespec);

+unsigned long
+timespec64_to_jiffies(const struct timespec64 *value)
+{
+ return __timespec_to_jiffies(value->tv_sec, value->tv_nsec);
+}
+EXPORT_SYMBOL(timespec64_to_jiffies);
+
+void
+jiffies_to_timespec64(const unsigned long jiffies, struct timespec64 *value)
+{
+ /*
+ * Convert jiffies to nanoseconds and separate with
+ * one divide.
+ */
+ u32 rem;
+ value->tv_sec = div_u64_rem((u64)jiffies * TICK_NSEC,
+ NSEC_PER_SEC, &rem);
+ value->tv_nsec = rem;
+}
+EXPORT_SYMBOL(jiffies_to_timespec64);
+
/*
* We could use a similar algorithm to timespec_to_jiffies (with a
* different multiplier for usec instead of nsec). But this has a
--
1.7.9.5