From ecf3e70304911be1c14cd21baa0bc611a53ec50b Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Wed, 25 Jun 2025 20:38:46 +0200 Subject: [PATCH] timekeeping: Provide adjtimex() for auxiliary clocks The behaviour is close to clock_adtime(CLOCK_REALTIME) with the following differences: 1) ADJ_SETOFFSET adjusts the auxiliary clock offset 2) ADJ_TAI is not supported 3) Leap seconds are not supported 4) PPS is not supported Signed-off-by: Thomas Gleixner Acked-by: John Stultz Link: https://lore.kernel.org/all/20250625183758.317946543@linutronix.de --- kernel/time/timekeeping.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 6770544f8c0e5..523670ec0d2ea 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -2875,10 +2875,26 @@ static int aux_clock_set(const clockid_t id, const struct timespec64 *tnew) return 0; } +static int aux_clock_adj(const clockid_t id, struct __kernel_timex *txc) +{ + struct tk_data *aux_tkd = aux_get_tk_data(id); + struct adjtimex_result result = { }; + + if (!aux_tkd) + return -ENODEV; + + /* + * @result is ignored for now as there are neither hrtimers nor a + * RTC related to auxiliary clocks for now. + */ + return __do_adjtimex(aux_tkd, txc, &result); +} + const struct k_clock clock_aux = { .clock_getres = aux_get_res, .clock_get_timespec = aux_get_timespec, .clock_set = aux_clock_set, + .clock_adj = aux_clock_adj, }; static __init void tk_aux_setup(void) -- 2.47.3