[.joined/src/trunk]: .joined/src/sys/dev/sysmon sysmon(9): Document lock order.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/.joined/src/rev/0f34609d5c09
branches:  trunk
changeset: 359352:0f34609d5c09
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Fri Dec 31 14:44:50 2021 +0000

description:
sysmon(9): Document lock order.

diffstat:

 sys/dev/sysmon/sysmonvar.h |  4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diffs (18 lines):

diff -r b539d6c8810a -r 0f34609d5c09 sys/dev/sysmon/sysmonvar.h
--- a/sys/dev/sysmon/sysmonvar.h        Fri Dec 31 14:30:20 2021 +0000
+++ b/sys/dev/sysmon/sysmonvar.h        Fri Dec 31 14:44:50 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: sysmonvar.h,v 1.52 2021/12/31 14:30:04 riastradh Exp $ */
+/*     $NetBSD: sysmonvar.h,v 1.53 2021/12/31 14:44:50 riastradh Exp $ */
 
 /*-
  * Copyright (c) 2000 Zembu Labs, Inc.
@@ -217,6 +217,8 @@
 
        /*
         * Locking/synchronization.
+        *
+        * Lock order: sme_global_mtx -> sme_mtx -> sme_work_mtx
         */
        int sme_busy;                   /* number of items on workqueue,
                                         * sme_work_mtx to read or write */