diff options
| author | Thomas Weißschuh <thomas.weissschuh@linutronix.de> | 2025-07-01 10:58:04 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-07-18 13:45:32 +0200 |
| commit | 9b7fc3f14576c268f62fe0b882fac5e61239b659 (patch) | |
| tree | d95ef8658d48429c608884dbc780000aebe58071 | |
| parent | 562f03ed967dc65e513a3e2e9821f656d5333b8e (diff) | |
vdso: Introduce aux_clock_resolution_ns()
Move the constant resolution to a shared header,
so the vDSO can use it and return it without going through a syscall.
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250701-vdso-auxclock-v1-10-df7d9f87b9b8@linutronix.de
| -rw-r--r-- | include/vdso/auxclock.h | 13 | ||||
| -rw-r--r-- | kernel/time/timekeeping.c | 6 |
2 files changed, 17 insertions, 2 deletions
diff --git a/include/vdso/auxclock.h b/include/vdso/auxclock.h new file mode 100644 index 000000000000..6d6e74cbc400 --- /dev/null +++ b/include/vdso/auxclock.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _VDSO_AUXCLOCK_H +#define _VDSO_AUXCLOCK_H + +#include <uapi/linux/time.h> +#include <uapi/linux/types.h> + +static __always_inline u64 aux_clock_resolution_ns(void) +{ + return 1; +} + +#endif /* _VDSO_AUXCLOCK_H */ diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index c6fe89bded02..cbcf090bb4be 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -26,6 +26,8 @@ #include <linux/audit.h> #include <linux/random.h> +#include <vdso/auxclock.h> + #include "tick-internal.h" #include "ntp_internal.h" #include "timekeeping_internal.h" @@ -2876,8 +2878,8 @@ static int aux_get_res(clockid_t id, struct timespec64 *tp) if (!clockid_aux_valid(id)) return -ENODEV; - tp->tv_sec = 0; - tp->tv_nsec = 1; + tp->tv_sec = aux_clock_resolution_ns() / NSEC_PER_SEC; + tp->tv_nsec = aux_clock_resolution_ns() % NSEC_PER_SEC; return 0; } |