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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