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sparc: Several small VDSO vclock_gettime.c improvements.

Browse Source 
Almost entirely borrowed from the x86 code.

Main improvement is to avoid having to initialize
ts->tv_nsec to zero before the sequence loops, by
expanding timespec_add_ns().

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2018-10-21 22:38:56 -07:00
parent ecd4c19f3d
commit 19832d2449
1 changed files with 4 additions and 4 deletions
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8
arch/sparc/vdso/vclock_gettime.c
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@ -138,7 +138,6 @@ notrace static __always_inline int do_realtime(struct vvar_data *vvar,
unsigned long seq;
u64 ns;
ts->tv_nsec = 0;
do {
seq = vvar_read_begin(vvar);
ts->tv_sec = vvar->wall_time_sec;
@ -147,7 +146,8 @@ notrace static __always_inline int do_realtime(struct vvar_data *vvar,
ns >>= vvar->clock.shift;
} while (unlikely(vvar_read_retry(vvar, seq)));
timespec_add_ns(ts, ns);
ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
ts->tv_nsec = ns;
return 0;
}
@ -158,7 +158,6 @@ notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
unsigned long seq;
u64 ns;
ts->tv_nsec = 0;
do {
seq = vvar_read_begin(vvar);
ts->tv_sec = vvar->monotonic_time_sec;
@ -167,7 +166,8 @@ notrace static __always_inline int do_monotonic(struct vvar_data *vvar,
ns >>= vvar->clock.shift;
} while (unlikely(vvar_read_retry(vvar, seq)));
timespec_add_ns(ts, ns);
ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
ts->tv_nsec = ns;
return 0;
}