Commit f7550d07 authored by Minfei Huang's avatar Minfei Huang Committed by Paolo Bonzini

pvclock: Cleanup to remove function pvclock_get_nsec_offset

Function __pvclock_read_cycles is short enough, so there is no need to
have another function pvclock_get_nsec_offset to calculate tsc delta.
It's better to combine it into function __pvclock_read_cycles.

Remove useless variables in function __pvclock_read_cycles.
Signed-off-by: default avatarMinfei Huang <mnghuan@gmail.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 749d088b
......@@ -68,32 +68,23 @@ static inline u64 pvclock_scale_delta(u64 delta, u32 mul_frac, int shift)
return product;
}
static __always_inline
u64 pvclock_get_nsec_offset(const struct pvclock_vcpu_time_info *src)
{
u64 delta = rdtsc_ordered() - src->tsc_timestamp;
return pvclock_scale_delta(delta, src->tsc_to_system_mul,
src->tsc_shift);
}
static __always_inline
unsigned __pvclock_read_cycles(const struct pvclock_vcpu_time_info *src,
cycle_t *cycles, u8 *flags)
{
unsigned version;
cycle_t ret, offset;
u8 ret_flags;
cycle_t offset;
u64 delta;
version = src->version;
/* Make the latest version visible */
smp_rmb();
offset = pvclock_get_nsec_offset(src);
ret = src->system_time + offset;
ret_flags = src->flags;
*cycles = ret;
*flags = ret_flags;
delta = rdtsc_ordered() - src->tsc_timestamp;
offset = pvclock_scale_delta(delta, src->tsc_to_system_mul,
src->tsc_shift);
*cycles = src->system_time + offset;
*flags = src->flags;
return version;
}
......
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