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vdso/vsyscall: Introduce a helper to fill clock configurations

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The logic to configure a 'struct vdso_clock' from a
'struct tk_read_base' is copied two times.
Split it into a shared function to reduce the duplication,
especially as another user will be added for auxiliary clocks.

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-v1-2-df7d9f87b9b8@linutronix.de
This commit is contained in:
Thomas Weißschuh 2025-07-01 10:57:56 +02:00 committed by Thomas Gleixner
parent 068f7b64bf
commit 6fedaf682a
1 changed files with 13 additions and 14 deletions
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27
kernel/time/vsyscall.c
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@ -15,26 +15,25 @@
#include "timekeeping_internal.h"
static inline void fill_clock_configuration(struct vdso_clock *vc, const struct tk_read_base *base)
{
vc->cycle_last = base->cycle_last;
#ifdef CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT
vc->max_cycles = base->clock->max_cycles;
#endif
vc->mask = base->mask;
vc->mult = base->mult;
vc->shift = base->shift;
}
static inline void update_vdso_time_data(struct vdso_time_data *vdata, struct timekeeper *tk)
{
struct vdso_clock *vc = vdata->clock_data;
struct vdso_timestamp *vdso_ts;
u64 nsec, sec;
vc[CS_HRES_COARSE].cycle_last = tk->tkr_mono.cycle_last;
#ifdef CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT
vc[CS_HRES_COARSE].max_cycles = tk->tkr_mono.clock->max_cycles;
#endif
vc[CS_HRES_COARSE].mask = tk->tkr_mono.mask;
vc[CS_HRES_COARSE].mult = tk->tkr_mono.mult;
vc[CS_HRES_COARSE].shift = tk->tkr_mono.shift;
vc[CS_RAW].cycle_last = tk->tkr_raw.cycle_last;
#ifdef CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT
vc[CS_RAW].max_cycles = tk->tkr_raw.clock->max_cycles;
#endif
vc[CS_RAW].mask = tk->tkr_raw.mask;
vc[CS_RAW].mult = tk->tkr_raw.mult;
vc[CS_RAW].shift = tk->tkr_raw.shift;
fill_clock_configuration(&vc[CS_HRES_COARSE], &tk->tkr_mono);
fill_clock_configuration(&vc[CS_RAW], &tk->tkr_raw);
/* CLOCK_MONOTONIC */
vdso_ts = &vc[CS_HRES_COARSE].basetime[CLOCK_MONOTONIC];