Subject: [patch V2 07/25] ptp: ptp_vmclock: Convert to ktime_get_snapshot_id()

From: Thomas Gleixner <[email-masked]>
Date: Fri, 29 May 2026 22:00:16 +0200

From: Thomas Gleixner <[email-masked]>

ktime_get_snapshot() is replaced by ktime_get_snapshot_id() which allows to
request a particular CLOCK ID to be captured along with the clocksource
counter.

Convert vmclock over and use the new system_time_snapshot::systime field,
which holds the system timestamp selected by the CLOCK ID argument.

No functional change intended.

Signed-off-by: Thomas Gleixner <[email-masked]>
Tested-by: David Woodhouse <[email-masked]>
Tested-by: Arthur Kiyanovski <[email-masked]>
Reviewed-by: David Woodhouse <[email-masked]>
Reviewed-by: Thomas Weißschuh <[email-masked]>
Reviewed-by: Jacob Keller <[email-masked]>
---
 drivers/ptp/ptp_vmclock.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/ptp/ptp_vmclock.c
+++ b/drivers/ptp/ptp_vmclock.c
@@ -132,7 +132,7 @@ static int vmclock_get_crosststamp(struc
 		 * will be derived from the *same* counter value.
 		 *
 		 * If the system isn't using the same counter, then the value
-		 * from ktime_get_snapshot() will still be used as pre_ts, and
+		 * from ktime_get_snapshot_id() will still be used as pre_ts, and
 		 * ptp_read_system_postts() is called to populate postts after
 		 * calling get_cycles().
 		 *
@@ -140,7 +140,7 @@ static int vmclock_get_crosststamp(struc
 		 * the seq_count loop.
 		 */
 		if (sts) {
-			ktime_get_snapshot(&systime_snapshot);
+			ktime_get_snapshot_id(CLOCK_REALTIME, &systime_snapshot);
 			if (systime_snapshot.cs_id == st->cs_id) {
 				cycle = systime_snapshot.cycles;
 			} else {
@@ -181,7 +181,7 @@ static int vmclock_get_crosststamp(struc
 	}
 
 	if (sts) {
-		sts->pre_ts = ktime_to_timespec64(systime_snapshot.real);
+		sts->pre_ts = ktime_to_timespec64(systime_snapshot.systime);
 		if (systime_snapshot.cs_id == st->cs_id)
 			sts->post_ts = sts->pre_ts;
 	}
@@ -272,7 +272,7 @@ static int ptp_vmclock_getcrosststamp(st
 	if (ret == -ENODEV) {
 		struct system_time_snapshot systime_snapshot;
 
-		ktime_get_snapshot(&systime_snapshot);
+		ktime_get_snapshot_id(CLOCK_REALTIME, &systime_snapshot);
 
 		if (systime_snapshot.cs_id == CSID_X86_TSC ||
 		    systime_snapshot.cs_id == CSID_X86_KVM_CLK) {