Date: Mon, 4 Dec 2017 09:41:57 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r326514 - stable/11/sys/i386/include Message-ID: <201712040941.vB49fvrW086988@repo.freebsd.org>
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Author: hselasky Date: Mon Dec 4 09:41:57 2017 New Revision: 326514 URL: https://svnweb.freebsd.org/changeset/base/326514 Log: 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 Modified: stable/11/sys/i386/include/atomic.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/i386/include/atomic.h ============================================================================== --- stable/11/sys/i386/include/atomic.h Mon Dec 4 09:36:47 2017 (r326513) +++ stable/11/sys/i386/include/atomic.h Mon Dec 4 09:41:57 2017 (r326514) @@ -124,6 +124,7 @@ 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 */ @@ -546,6 +547,17 @@ 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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