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timekeeping: Add CLOCK_AUX support for ktime_get_snapshot_id()

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Now that all users are converted it's possible to enable snapshotting of
CLOCK_AUX time. The underlying clocksource is the same as for all other
CLOCK variants.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Arthur Kiyanovski <akiyano@amazon.com>
Reviewed-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Link: https://patch.msgid.link/20260529195557.380601005@kernel.org
This commit is contained in:
Thomas Gleixner
2026-05-29 22:00:24 +02:00
parent 705e106807
commit 23c1bfa9f8
1 changed files with 15 additions and 0 deletions
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15
kernel/time/timekeeping.c
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@@ -67,6 +67,7 @@ static inline bool tk_is_aux(const struct timekeeper *tk)
{
return tk->id >= TIMEKEEPER_AUX_FIRST && tk->id <= TIMEKEEPER_AUX_LAST;
}
static inline struct tk_data *aux_get_tk_data(clockid_t id);
#else
static inline bool tk_get_aux_ts64(unsigned int tkid, struct timespec64 *ts)
{
@@ -77,6 +78,10 @@ static inline bool tk_is_aux(const struct timekeeper *tk)
{
return false;
}
static inline struct tk_data *aux_get_tk_data(clockid_t id)
{
return NULL;
}
#endif
static inline void tk_update_aux_offs(struct timekeeper *tk, ktime_t offs)
@@ -1218,6 +1223,12 @@ void ktime_get_snapshot_id(clockid_t clock_id, struct system_time_snapshot *syst
tkd = &tk_core;
offs = &tk_core.timekeeper.offs_boot;
break;
case CLOCK_AUX ... CLOCK_AUX_LAST:
tkd = aux_get_tk_data(clock_id);
if (!tkd)
return;
offs = &tkd->timekeeper.offs_aux;
break;
default:
WARN_ON_ONCE(1);
return;
@@ -1228,6 +1239,10 @@ void ktime_get_snapshot_id(clockid_t clock_id, struct system_time_snapshot *syst
do {
seq = read_seqcount_begin(&tkd->seq);
/* Aux clocks can be invalid */
if (!tk->clock_valid)
return;
now = tk_clock_read(&tk->tkr_mono);
systime_snapshot->cs_id = tk->tkr_mono.clock->id;
systime_snapshot->cs_was_changed_seq = tk->cs_was_changed_seq;