time: Remove unused functions

The (slow but) ongoing work on conversion from timespec to timespec64
has led some timespec based helper functions to become unused.

No new code should use them, so we can remove the functions entirely.
I'm planning to obsolete additional interfaces next and remove
more of these.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Miroslav Lichvar <mlichvar@redhat.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>

include/linux/time.h

@@ -39,15 +39,6 @@ static inline int timespec_compare(const struct timespec *lhs, const struct time
 	return lhs->tv_nsec - rhs->tv_nsec;
 }
 
-static inline int timeval_compare(const struct timeval *lhs, const struct timeval *rhs)
-{
-	if (lhs->tv_sec < rhs->tv_sec)
-		return -1;
-	if (lhs->tv_sec > rhs->tv_sec)
-		return 1;
-	return lhs->tv_usec - rhs->tv_usec;
-}
-
 extern time64_t mktime64(const unsigned int year, const unsigned int mon,
 			const unsigned int day, const unsigned int hour,
 			const unsigned int min, const unsigned int sec);
@@ -65,15 +56,6 @@ static inline unsigned long mktime(const unsigned int year,
 
 extern void set_normalized_timespec(struct timespec *ts, time_t sec, s64 nsec);
 
-/*
- * timespec_add_safe assumes both values are positive and checks
- * for overflow. It will return TIME_T_MAX if the reutrn would be
- * smaller then either of the arguments.
- */
-extern struct timespec timespec_add_safe(const struct timespec lhs,
-					 const struct timespec rhs);
-
-
 static inline struct timespec timespec_add(struct timespec lhs,
 						struct timespec rhs)
 {

include/linux/time64.h

@@ -53,16 +53,6 @@ static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
 	return ts;
 }
 
-static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
-{
-	return *its64;
-}
-
-static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
-{
-	return *its;
-}
-
 # define timespec64_equal		timespec_equal
 # define timespec64_compare		timespec_compare
 # define set_normalized_timespec64	set_normalized_timespec
@@ -94,24 +84,6 @@ static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
 	return ret;
 }
 
-static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
-{
-	struct itimerspec ret;
-
-	ret.it_interval = timespec64_to_timespec(its64->it_interval);
-	ret.it_value = timespec64_to_timespec(its64->it_value);
-	return ret;
-}
-
-static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
-{
-	struct itimerspec64 ret;
-
-	ret.it_interval = timespec_to_timespec64(its->it_interval);
-	ret.it_value = timespec_to_timespec64(its->it_value);
-	return ret;
-}
-
 static inline int timespec64_equal(const struct timespec64 *a,
 				   const struct timespec64 *b)
 {

kernel/time/time.c

@@ -818,24 +818,6 @@ unsigned long nsecs_to_jiffies(u64 n)
 }
 EXPORT_SYMBOL_GPL(nsecs_to_jiffies);
 
-/*
- * Add two timespec values and do a safety check for overflow.
- * It's assumed that both values are valid (>= 0)
- */
-struct timespec timespec_add_safe(const struct timespec lhs,
-				  const struct timespec rhs)
-{
-	struct timespec res;
-
-	set_normalized_timespec(&res, lhs.tv_sec + rhs.tv_sec,
-				lhs.tv_nsec + rhs.tv_nsec);
-
-	if (res.tv_sec < lhs.tv_sec || res.tv_sec < rhs.tv_sec)
-		res.tv_sec = TIME_T_MAX;
-
-	return res;
-}
-
 /*
  * Add two timespec64 values and do a safety check for overflow.
  * It's assumed that both values are valid (>= 0).