linux-kernel - [tip: timers/core] timekeeping: Rework timekeeping_init() to use shadow

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Message-ID: <172986802868.1442.2489428187408069194.tip-bot2@tip-bot2>
Date: Fri, 25 Oct 2024 14:53:48 -0000
From: "tip-bot2 for Anna-Maria Behnsen" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Anna-Maria Behnsen" <anna-maria@...utronix.de>,
 Thomas Gleixner <tglx@...utronix.de>, John Stultz <jstultz@...gle.com>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: timers/core] timekeeping: Rework timekeeping_init() to use
 shadow_timekeeper

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

Commit-ID:     15234cc8e924ca3d23ef1b77410faaec274e90aa
Gitweb:        https://git.kernel.org/tip/15234cc8e924ca3d23ef1b77410faaec274e90aa
Author:        Anna-Maria Behnsen <anna-maria@...utronix.de>
AuthorDate:    Wed, 09 Oct 2024 10:29:12 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Fri, 25 Oct 2024 16:41:13 +02:00

timekeeping: Rework timekeeping_init() to use shadow_timekeeper

For timekeeping_init() the sequence count write held time is not relevant
and it could keep working on the real timekeeper, but there is no reason to
make it different from other timekeeper updates.

Convert it to operate on the shadow timekeeper.

Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: John Stultz <jstultz@...gle.com>
Link: https://lore.kernel.org/all/20241009-devel-anna-maria-b4-timers-ptp-timekeeping-v2-19-554456a44a15@linutronix.de

---
 kernel/time/timekeeping.c | 16 +++++++---------
 1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index f77782f..4e0037d 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -1809,7 +1809,7 @@ static bool persistent_clock_exists;
 void __init timekeeping_init(void)
 {
 	struct timespec64 wall_time, boot_offset, wall_to_mono;
-	struct timekeeper *tk = &tk_core.timekeeper;
+	struct timekeeper *tks = &tk_core.shadow_timekeeper;
 	struct clocksource *clock;
 
 	tkd_basic_setup(&tk_core);
@@ -1833,22 +1833,20 @@ void __init timekeeping_init(void)
 	wall_to_mono = timespec64_sub(boot_offset, wall_time);
 
 	guard(raw_spinlock_irqsave)(&tk_core.lock);
-	write_seqcount_begin(&tk_core.seq);
+
 	ntp_init();
 
 	clock = clocksource_default_clock();
 	if (clock->enable)
 		clock->enable(clock);
-	tk_setup_internals(tk, clock);
+	tk_setup_internals(tks, clock);
 
-	tk_set_xtime(tk, &wall_time);
-	tk->raw_sec = 0;
+	tk_set_xtime(tks, &wall_time);
+	tks->raw_sec = 0;
 
-	tk_set_wall_to_mono(tk, wall_to_mono);
+	tk_set_wall_to_mono(tks, wall_to_mono);
 
-	timekeeping_update(&tk_core, tk, TK_MIRROR | TK_CLOCK_WAS_SET);
-
-	write_seqcount_end(&tk_core.seq);
+	timekeeping_update_from_shadow(&tk_core, TK_CLOCK_WAS_SET);
 }
 
 /* time in seconds when suspend began for persistent clock */