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vdso/gettimeofday: Introduce vdso_set_timespec()

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This code is duplicated and with the introduction of auxiliary clocks will
be duplicated even more.

Introduce a helper.

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-v1-8-df7d9f87b9b8@linutronix.de
This commit is contained in:
Thomas Weißschuh
2025-07-01 10:58:02 +02:00
committed by Thomas Gleixner
parent 1a1cd5fe88
commit 381d96ccc1
1 changed files with 14 additions and 18 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
lib/vdso/gettimeofday.c
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@@ -77,6 +77,16 @@ static __always_inline bool vdso_clockid_valid(clockid_t clock)
return likely((u32) clock < MAX_CLOCKS);
}
/*
* Must not be invoked within the sequence read section as a race inside
* that loop could result in __iter_div_u64_rem() being extremely slow.
*/
static __always_inline void vdso_set_timespec(struct __kernel_timespec *ts, u64 sec, u64 ns)
{
ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
ts->tv_nsec = ns;
}
#ifdef CONFIG_TIME_NS
#ifdef CONFIG_GENERIC_VDSO_DATA_STORE
@@ -122,12 +132,7 @@ bool do_hres_timens(const struct vdso_time_data *vdns, const struct vdso_clock *
sec += offs->sec;
ns += offs->nsec;
/*
* Do this outside the loop: a race inside the loop could result
* in __iter_div_u64_rem() being extremely slow.
*/
ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
ts->tv_nsec = ns;
vdso_set_timespec(ts, sec, ns);
return true;
}
@@ -188,12 +193,7 @@ bool do_hres(const struct vdso_time_data *vd, const struct vdso_clock *vc,
sec = vdso_ts->sec;
} while (unlikely(vdso_read_retry(vc, seq)));
/*
* Do this outside the loop: a race inside the loop could result
* in __iter_div_u64_rem() being extremely slow.
*/
ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
ts->tv_nsec = ns;
vdso_set_timespec(ts, sec, ns);
return true;
}
@@ -223,12 +223,8 @@ bool do_coarse_timens(const struct vdso_time_data *vdns, const struct vdso_clock
sec += offs->sec;
nsec += offs->nsec;
/*
* Do this outside the loop: a race inside the loop could result
* in __iter_div_u64_rem() being extremely slow.
*/
ts->tv_sec = sec + __iter_div_u64_rem(nsec, NSEC_PER_SEC, &nsec);
ts->tv_nsec = nsec;
vdso_set_timespec(ts, sec, nsec);
return true;
}
#else