Commit 61680246 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

timekeeping: Add clock_valid flag to timekeeper 



In preparation for supporting independent auxiliary timekeepers, add a
clock valid field and set it to true for the system timekeeper.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarJohn Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250519083026.287145536@linutronix.de
parent 8c782acd

include/linux/timekeeper_internal.h

+2 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ struct tk_read_base { 
 * @raw_sec:			CLOCK_MONOTONIC_RAW  time in seconds

 * @clock_was_set_seq:		The sequence number of clock was set events

 * @cs_was_changed_seq:		The sequence number of clocksource change events

 * @clock_valid:		Indicator for valid clock

 * @monotonic_to_boot:		CLOCK_MONOTONIC to CLOCK_BOOTTIME offset

 * @cycle_interval:		Number of clock cycles in one NTP interval

 * @xtime_interval:		Number of clock shifted nano seconds in one NTP
@@ -149,6 +150,7 @@ struct timekeeper { 
	/* Cachline 3 and 4 (timekeeping internal variables): */

	unsigned int		clock_was_set_seq;

	u8			cs_was_changed_seq;

	u8			clock_valid;



	struct timespec64	monotonic_to_boot;

kernel/time/timekeeping.c

+3 −2
Original line number Diff line number Diff line
@@ -1665,11 +1665,12 @@ read_persistent_wall_and_boot_offset(struct timespec64 *wall_time, 
	*boot_offset = ns_to_timespec64(local_clock());

}



static __init void tkd_basic_setup(struct tk_data *tkd, enum timekeeper_ids tk_id)

static __init void tkd_basic_setup(struct tk_data *tkd, enum timekeeper_ids tk_id, bool valid)

{

	raw_spin_lock_init(&tkd->lock);

	seqcount_raw_spinlock_init(&tkd->seq, &tkd->lock);

	tkd->timekeeper.id = tkd->shadow_timekeeper.id = tk_id;

	tkd->timekeeper.clock_valid = tkd->shadow_timekeeper.clock_valid = valid;

}



/*
@@ -1699,7 +1700,7 @@ void __init timekeeping_init(void) 
	struct timekeeper *tks = &tk_core.shadow_timekeeper;

	struct clocksource *clock;



	tkd_basic_setup(&tk_core, TIMEKEEPER_CORE);

	tkd_basic_setup(&tk_core, TIMEKEEPER_CORE, true);



	read_persistent_wall_and_boot_offset(&wall_time, &boot_offset);

	if (timespec64_valid_settod(&wall_time) &&