Date: Thu, 23 Jun 2016 08:27:38 +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: r302130 - head/sys/vm Message-ID: <201606230827.u5N8Rc2B050310@repo.freebsd.org>
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Author: kib Date: Thu Jun 23 08:27:38 2016 New Revision: 302130 URL: https://svnweb.freebsd.org/changeset/base/302130 Log: Add a comment noting locking regime for vm_page_xunbusy(). Reviewed by: alc Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Approved by: re (gjb) Modified: head/sys/vm/vm_page.h Modified: head/sys/vm/vm_page.h ============================================================================== --- head/sys/vm/vm_page.h Thu Jun 23 08:26:07 2016 (r302129) +++ head/sys/vm/vm_page.h Thu Jun 23 08:27:38 2016 (r302130) @@ -552,6 +552,7 @@ void vm_page_lock_assert_KBI(vm_page_t m (m)); \ } while (0) +/* Note: page m's lock must not be owned by the caller. */ #define vm_page_xunbusy(m) do { \ if (!atomic_cmpset_rel_int(&(m)->busy_lock, \ VPB_SINGLE_EXCLUSIVER, VPB_UNBUSIED)) \
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