Date: Wed, 15 Jul 2015 21:44:17 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r285616 - head/sys/kern Message-ID: <201507152144.t6FLiHVS000545@svnmir.geo.freebsd.org>
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Author: kib Date: Wed Jul 15 21:44:16 2015 New Revision: 285616 URL: https://svnweb.freebsd.org/changeset/base/285616 Log: Do not use atomic_swap_int(9), it is not available on all architectures. Atomic_cmpset_int(9) is a direct replacement, due to loop. The change fixes arm, arm64, mips an sparc64, which lack atomic_swap(). Suggested and reviewed by: alc Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Modified: head/sys/kern/kern_intr.c Modified: head/sys/kern/kern_intr.c ============================================================================== --- head/sys/kern/kern_intr.c Wed Jul 15 21:35:09 2015 (r285615) +++ head/sys/kern/kern_intr.c Wed Jul 15 21:44:16 2015 (r285616) @@ -1327,7 +1327,7 @@ ithread_loop(void *arg) * we are running, it will set it_need to note that we * should make another pass. */ - while (atomic_swap_int(&ithd->it_need, 0) != 0) { + while (atomic_cmpset_int(&ithd->it_need, 1, 0) != 0) { /* * This needs a release barrier to make sure * that this write posts before any of the @@ -1506,7 +1506,7 @@ ithread_loop(void *arg) * we are running, it will set it_need to note that we * should make another pass. */ - while (atomic_swap_int(&ithd->it_need, 0) != 0) { + while (atomic_cmpset_int(&ithd->it_need, 1, 0) != 0) { /* * This needs a release barrier to make sure * that this write posts before any of the
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