From 0a287ab0d54d9a8edc4341bc033dfccd884a2be0 Mon Sep 17 00:00:00 2001 From: hselasky Date: Mon, 4 Dec 2017 09:48:31 +0000 Subject: [PATCH] MFC r326161: Implement atomic_fetchadd_64() for i386. This function is needed by the atomic64 header file in the LinuxKPI for i386. Reviewed by: kib Sponsored by: Mellanox Technologies git-svn-id: svn://svn.freebsd.org/base/stable/9@326517 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/i386/include/atomic.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/sys/i386/include/atomic.h b/sys/i386/include/atomic.h index f17cdc891..e31b0c4b5 100644 --- a/sys/i386/include/atomic.h +++ b/sys/i386/include/atomic.h @@ -94,6 +94,7 @@ void atomic_store_rel_##TYPE(volatile u_##TYPE *p, u_##TYPE v) int atomic_cmpset_64(volatile uint64_t *, 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 */ @@ -480,6 +481,17 @@ 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 */ -- 2.42.0