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timekeeping: Rework timekeeping_init() to use shadow_timekeeper

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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@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20241009-devel-anna-maria-b4-timers-ptp-timekeeping-v2-19-554456a44a15@linutronix.de
This commit is contained in:
Anna-Maria Behnsen 2024-10-09 10:29:12 +02:00 • committed by Thomas Gleixner
parent 351619fc99
commit 2cab490b41
1 changed files with 7 additions and 9 deletions
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16
kernel/time/timekeeping.c
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@ -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 */