linux-kernel - [PATCH] timekeeping: Fix bogus clock_was_set() invocation in do

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Message-ID: <877ccx7igo.ffs@tglx>
Date: Sat, 03 Aug 2024 17:07:51 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: John Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>,
 Anna-Maria Behnsen <anna-maria@...utronix.de>, Frederic Weisbecker
 <frederic@...nel.org>
Subject: [PATCH] timekeeping: Fix bogus clock_was_set() invocation in
 do_adjtimex()

The addition of the bases argument to clock_was_set() fixed up all call
sites correctly except for do_adjtimex(). This uses CLOCK_REALTIME
instead of CLOCK_SET_WALL as argument. CLOCK_REALTIME is 0.

As a result the effect of that clock_was_set() notification is incomplete
and might result in timers expiring late because the hrtimer code does
not re-evaluate the affected clock bases.

Use CLOCK_SET_WALL instead of CLOCK_REALTIME to tell the hrtimers code
which clock bases need to be re-evaluated.

Fixes: 17a1b8826b45 ("hrtimer: Add bases argument to clock_was_set()")
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: John Stultz <jstultz@...gle.com>
Cc: Stephen Boyd <sboyd@...nel.org>
Cc: stable@...r.kernel.org
---
 kernel/time/timekeeping.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2606,7 +2606,7 @@ int do_adjtimex(struct __kernel_timex *t
 		clock_set |= timekeeping_advance(TK_ADV_FREQ);

 	if (clock_set)
-		clock_was_set(CLOCK_REALTIME);
+		clock_was_set(CLOCK_SET_WALL);

 	ntp_notify_cmos_timer();