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Implement atomic_long_cmpxchg() function in the LinuxKPI.

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Submitted by:	Johannes Lundberg <johalun0@gmail.com>
MFC after:	1 week
Sponsored by:	Mellanox Technologies
This commit is contained in:
Hans Petter Selasky 2018-08-06 08:40:02 +00:00
parent f698bc4d76
commit db119089be
1 changed files with 15 additions and 0 deletions
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15
sys/compat/linuxkpi/common/include/asm/atomic-long.h
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@ -81,6 +81,21 @@ atomic_long_xchg(atomic_long_t *v, long val)
return atomic_swap_long(&v->counter, val);
}
static inline long
atomic_long_cmpxchg(atomic_long_t *v, long old, long new)
{
long ret = old;
for (;;) {
if (atomic_cmpset_long(&v->counter, old, new))
break;
ret = READ_ONCE(v->counter);
if (ret != old)
break;
}
return (ret);
}
static inline int
atomic_long_add_unless(atomic_long_t *v, long a, long u)
{