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timekeeping: Rework timekeeping_inject_sleeptime64() to use shadow_timekeeper

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Updates of the timekeeper can be done by operating on the shadow timekeeper
and afterwards copying the result into the real timekeeper. This has the
advantage, that the sequence count write protected region is kept as small
as possible.

Convert timekeeping_inject_sleeptime64() to use this scheme.

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-v2-20-554456a44a15@linutronix.de
This commit is contained in:
Anna-Maria Behnsen 2024-10-09 10:29:13 +02:00 committed by Thomas Gleixner
parent 2cab490b41
commit 2b473e65de
1 changed files with 7 additions and 15 deletions
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22
kernel/time/timekeeping.c
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@ -1924,22 +1924,14 @@ bool timekeeping_rtc_skipsuspend(void)
*/
void timekeeping_inject_sleeptime64(const struct timespec64 *delta)
{
struct timekeeper *tk = &tk_core.timekeeper;
unsigned long flags;
scoped_guard(raw_spinlock_irqsave, &tk_core.lock) {
struct timekeeper *tks = &tk_core.shadow_timekeeper;
raw_spin_lock_irqsave(&tk_core.lock, flags);
write_seqcount_begin(&tk_core.seq);
suspend_timing_needed = false;
timekeeping_forward_now(tk);
__timekeeping_inject_sleeptime(tk, delta);
timekeeping_update(&tk_core, tk, TK_UPDATE_ALL | TK_MIRROR);
write_seqcount_end(&tk_core.seq);
raw_spin_unlock_irqrestore(&tk_core.lock, flags);
suspend_timing_needed = false;
timekeeping_forward_now(tks);
__timekeeping_inject_sleeptime(tks, delta);
timekeeping_update_from_shadow(&tk_core, TK_UPDATE_ALL);
}
/* Signal hrtimers about time change */
clock_was_set(CLOCK_SET_WALL | CLOCK_SET_BOOT);