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timekeeping: Provide adjtimex() for auxiliary clocks

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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 <tglx@linutronix.de>
Acked-by: John Stultz <jstultz@google.com>
Link: https://lore.kernel.org/all/20250625183758.317946543@linutronix.de
This commit is contained in:
Thomas Gleixner
2025-06-25 20:38:46 +02:00
parent 4eca49d0b6
commit ecf3e70304
1 changed files with 16 additions and 0 deletions
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16
kernel/time/timekeeping.c
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@@ -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)