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Implement atomic_fetchadd_64() for i386. This function is needed by the

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atomic64 header file in the LinuxKPI for i386.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
hselasky 2017-11-24 12:10:42 +00:00
parent 993cc07930
commit cd19f399a1
1 changed files with 12 additions and 0 deletions
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12
sys/i386/include/atomic.h
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@ -129,6 +129,7 @@ int atomic_cmpset_64(volatile uint64_t *, uint64_t, uint64_t);
uint64_t atomic_load_acq_64(volatile uint64_t *);
void atomic_store_rel_64(volatile uint64_t *, uint64_t);
uint64_t atomic_swap_64(volatile uint64_t *, uint64_t);
uint64_t atomic_fetchadd_64(volatile uint64_t *, uint64_t);
#else /* !KLD_MODULE && __GNUCLIKE_ASM */
@ -565,6 +566,17 @@ atomic_swap_64(volatile uint64_t *p, uint64_t v)
return (atomic_swap_64_i586(p, v));
}
static __inline uint64_t
atomic_fetchadd_64(volatile uint64_t *p, uint64_t v)
{
for (;;) {
uint64_t t = *p;
if (atomic_cmpset_64(p, t, t + v))
return (t);
}
}
#endif /* _KERNEL */
#endif /* KLD_MODULE || !__GNUCLIKE_ASM */