linux-kernel - [tip: timers/urgent] timekeeping: Fix bogus clock_was_set() invocation in do

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Message-ID: <172286772893.2215.12693341202200297923.tip-bot2@tip-bot2>
Date: Mon, 05 Aug 2024 14:22:08 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>, stable@...r.kernel.org,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/urgent] timekeeping: Fix bogus clock_was_set()
 invocation in do_adjtimex()

The following commit has been merged into the timers/urgent branch of tip:

Commit-ID:     5916be8a53de6401871bdd953f6c60237b47d6d3
Gitweb:        https://git.kernel.org/tip/5916be8a53de6401871bdd953f6c60237b47d6d3
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Sat, 03 Aug 2024 17:07:51 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 05 Aug 2024 16:14:14 +02:00

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: stable@...r.kernel.org
Link: https://lore.kernel.org/all/877ccx7igo.ffs@tglx

---
 kernel/time/timekeeping.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 2fa87dc..5391e41 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -2606,7 +2606,7 @@ int do_adjtimex(struct __kernel_timex *txc)
 		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();