netdev - [patch V2 10/26] timekeeping: Prepare timekeeping_update_from

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Message-ID: <20250519083026.223876435@linutronix.de>
Date: Mon, 19 May 2025 10:33:26 +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 10/26] timekeeping: Prepare
 timekeeping_update_from_shadow()

From: Thomas Gleixner <tglx@...utronix.de>

Don't invoke the VDSO and paravirt updates when utilized for auxiliary
clocks. This is a temporary workaround until the VDSO and paravirt
interfaces have been worked out.

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

---
 kernel/time/timekeeping.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)
---
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -683,13 +683,15 @@ static void timekeeping_update_from_shad
 
 	tk_update_leap_state(tk);
 	tk_update_ktime_data(tk);
+	tk->tkr_mono.base_real = tk->tkr_mono.base + tk->offs_real;
 
-	update_vsyscall(tk);
-	update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
+	if (tk->id == TIMEKEEPER_CORE) {
+		update_vsyscall(tk);
+		update_pvclock_gtod(tk, action & TK_CLOCK_WAS_SET);
 
-	tk->tkr_mono.base_real = tk->tkr_mono.base + tk->offs_real;
-	update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
-	update_fast_timekeeper(&tk->tkr_raw,  &tk_fast_raw);
+		update_fast_timekeeper(&tk->tkr_mono, &tk_fast_mono);
+		update_fast_timekeeper(&tk->tkr_raw,  &tk_fast_raw);
+	}
 
 	if (action & TK_CLOCK_WAS_SET)
 		tk->clock_was_set_seq++;