Author: hselasky
Date: Fri Nov 24 12:10:42 2017
New Revision: 326161
URL: https://svnweb.freebsd.org/changeset/base/326161
Log:
Implement atomic_fetchadd_64() for i386. This function is needed by the
atomic64 header file in the LinuxKPI for i386.
Reviewed by: kib
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/i386/include/atomic.h
Modified: head/sys/i386/include/atomic.h
==============================================================================
--- head/sys/i386/include/atomic.h Fri Nov 24 12:08:50 2017
(r326160)
+++ head/sys/i386/include/atomic.h Fri Nov 24 12:10:42 2017
(r326161)
@@ -129,6 +129,7 @@ int atomic_cmpset_64(volatile uint64_t *, uint64_t,
u
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 */
@@ -563,6 +564,17 @@ atomic_swap_64(volatile uint64_t *p, uint64_t v)
return (atomic_swap_64_i386(p, v));
else
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 */
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