netdev - [patch V2 13/26] timekeeping: Provide ktime_get_ntp

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Message-ID: <20250519083026.411809421@linutronix.de>
Date: Mon, 19 May 2025 10:33:30 +0200 (CEST)
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: netdev@...r.kernel.org,
 Richard Cochran <richardcochran@...il.com>,
 Christopher Hall <christopher.s.hall@...el.com>,
 John Stultz <jstultz@...gle.com>,
 Frederic Weisbecker <frederic@...nel.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>,
 Miroslav Lichvar <mlichvar@...hat.com>,
 Werner Abt <werner.abt@...nberg-usa.com>,
 David Woodhouse <dwmw2@...radead.org>,
 Stephen Boyd <sboyd@...nel.org>,
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>,
 Kurt Kanzenbach <kurt@...utronix.de>,
 Nam Cao <namcao@...utronix.de>,
 Antoine Tenart <atenart@...nel.org>
Subject: [patch V2 13/26] timekeeping: Provide ktime_get_ntp_seconds()

ntp_adjtimex() requires access to the actual time keeper per timekeeper
ID. Provide an interface.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 kernel/time/timekeeping.c          |    9 +++++++++
 kernel/time/timekeeping_internal.h |    3 +++
 2 files changed, 12 insertions(+)
---
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2627,6 +2627,15 @@ int do_adjtimex(struct __kernel_timex *t
 	return ret;
 }
 
+/*
+ * Invoked from NTP with the time keeper lock held, so lockless access is
+ * fine.
+ */
+long ktime_get_ntp_seconds(unsigned int id)
+{
+	return timekeeper_data[id].timekeeper.xtime_sec;
+}
+
 #ifdef CONFIG_NTP_PPS
 /**
  * hardpps() - Accessor function to NTP __hardpps function
--- a/kernel/time/timekeeping_internal.h
+++ b/kernel/time/timekeeping_internal.h
@@ -45,4 +45,7 @@ static inline u64 clocksource_delta(u64
 unsigned long timekeeper_lock_irqsave(void);
 void timekeeper_unlock_irqrestore(unsigned long flags);
 
+/* NTP specific interface to access the current seconds value */
+long ktime_get_ntp_seconds(unsigned int id);
+
 #endif /* _TIMEKEEPING_INTERNAL_H */