Commit 9a6b5197 authored by Thomas Gleixner's avatar Thomas Gleixner Committed by John Stultz
Browse files

timekeeping: Provide ktime_mono_to_any() 



ktime based conversion function to map a monotonic time stamp to a
different CLOCK.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
parent 48064f5f

include/linux/timekeeping.h

+9 −0
Original line number Diff line number Diff line
@@ -109,6 +109,7 @@ enum tk_offsets { 
extern ktime_t ktime_get(void);

extern ktime_t ktime_get_with_offset(enum tk_offsets offs);

extern ktime_t ktime_get_monotonic_offset(void);

extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);



/**

 * ktime_get_real - get the real (wall-) time in ktime_t format
@@ -137,6 +138,14 @@ static inline ktime_t ktime_get_clocktai(void) 
	return ktime_get_with_offset(TK_OFFS_TAI);

}



/**

 * ktime_mono_to_real - Convert monotonic time to clock realtime

 */

static inline ktime_t ktime_mono_to_real(ktime_t mono)

{

	return ktime_mono_to_any(mono, TK_OFFS_REAL);

}



/*

 * RTC specific

 */

kernel/time/timekeeping.c

+20 −0
Original line number Diff line number Diff line
@@ -450,6 +450,26 @@ ktime_t ktime_get_with_offset(enum tk_offsets offs) 
}

EXPORT_SYMBOL_GPL(ktime_get_with_offset);



/**

 * ktime_mono_to_any() - convert mononotic time to any other time

 * @tmono:	time to convert.

 * @offs:	which offset to use

 */

ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs)

{

	ktime_t *offset = offsets[offs];

	unsigned long seq;

	ktime_t tconv;



	do {

		seq = read_seqcount_begin(&tk_core.seq);

		tconv = ktime_add(tmono, *offset);

	} while (read_seqcount_retry(&tk_core.seq, seq));



	return tconv;

}

EXPORT_SYMBOL_GPL(ktime_mono_to_any);



/**

 * ktime_get_ts64 - get the monotonic clock in timespec64 format

 * @ts:		pointer to timespec variable