BackPup/Linux
1
0 Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-07 22:37:45 -04:00
Code Issues Packages Projects Releases Wiki Activity

time: Remove duplicated code in ktime_get_raw_and_real()

Browse Source 
The code in ktime_get_snapshot() is a superset of the code in
ktime_get_raw_and_real() code. Further, ktime_get_raw_and_real() is
called only by the PPS code, pps_get_ts(). Consolidate the
pps_get_ts() code into a single function calling ktime_get_snapshot()
and eliminate ktime_get_raw_and_real(). A side effect of this is that
the raw and real results of pps_get_ts() correspond to exactly the
same clock cycle. Previously these values represented separate reads
of the system clock.

Cc: Prarit Bhargava <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Reviewed-by: Thomas Gleixner <[email protected]>
Signed-off-by: Christopher S. Hall <[email protected]>
Signed-off-by: John Stultz <[email protected]>
This commit is contained in:
Christopher S. Hall authored and John Stultz committed 2016-03-02 17:13:02 -08:00
1 parent 9da0f49c87
commit ba26621e63
2 files changed
+10 -51
Download Patch File Download Diff File Expand all files Collapse all files

No files matched your search

include/linux/pps_kernel.h
+8 -13
View File
@@ -111,22 +111,17 @@ static inline void timespec_to_pps_ktime(struct pps_ktime *kt,
kt->nsec = ts.tv_nsec;
}
static inline void pps_get_ts(struct pps_event_time *ts)
{
struct system_time_snapshot snap;
ktime_get_snapshot(&snap);
ts->ts_real = ktime_to_timespec64(snap.real);
#ifdef CONFIG_NTP_PPS
static inline void pps_get_ts(struct pps_event_time *ts)
{
ktime_get_raw_and_real_ts64(&ts->ts_raw, &ts->ts_real);
ts->ts_raw = ktime_to_timespec64(snap.raw);
#endif
}
#else /* CONFIG_NTP_PPS */
static inline void pps_get_ts(struct pps_event_time *ts)
{
ktime_get_real_ts64(&ts->ts_real);
}
#endif /* CONFIG_NTP_PPS */
/* Subtract known time delay from PPS event time(s) */
static inline void pps_sub_ts(struct pps_event_time *ts, struct timespec64 delta)
{
kernel/time/timekeeping.c
+2 -38
View File
@@ -888,6 +888,8 @@ void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
s64 nsec_real;
cycle_t now;
WARN_ON_ONCE(timekeeping_suspended);
do {
seq = read_seqcount_begin(&tk_core.seq);
@@ -905,44 +907,6 @@ void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot)
}
EXPORT_SYMBOL_GPL(ktime_get_snapshot);
#ifdef CONFIG_NTP_PPS
/**
* ktime_get_raw_and_real_ts64 - get day and raw monotonic time in timespec format
* @ts_raw: pointer to the timespec to be set to raw monotonic time
* @ts_real: pointer to the timespec to be set to the time of day
*
* This function reads both the time of day and raw monotonic time at the
* same time atomically and stores the resulting timestamps in timespec
* format.
*/
void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw, struct timespec64 *ts_real)
{
struct timekeeper *tk = &tk_core.timekeeper;
unsigned long seq;
s64 nsecs_raw, nsecs_real;
WARN_ON_ONCE(timekeeping_suspended);
do {
seq = read_seqcount_begin(&tk_core.seq);
*ts_raw = tk->raw_time;
ts_real->tv_sec = tk->xtime_sec;
ts_real->tv_nsec = 0;
nsecs_raw = timekeeping_get_ns(&tk->tkr_raw);
nsecs_real = timekeeping_get_ns(&tk->tkr_mono);
} while (read_seqcount_retry(&tk_core.seq, seq));
timespec64_add_ns(ts_raw, nsecs_raw);
timespec64_add_ns(ts_real, nsecs_real);
}
EXPORT_SYMBOL(ktime_get_raw_and_real_ts64);
#endif /* CONFIG_NTP_PPS */
/**
* do_gettimeofday - Returns the time of day in a timeval
* @tv: pointer to the timeval to be set