From c3ae9c5291e5203002f6b2eb91012f528290a055 Mon Sep 17 00:00:00 2001
From: rwatson <rwatson@FreeBSD.org>
Date: Sun, 18 Jul 2004 21:50:22 +0000
Subject: Comment clarifying debug_mpsafenet.

---
 sys/net/netisr.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'sys')

diff --git a/sys/net/netisr.c b/sys/net/netisr.c
index ee2c6426..ca2a6cb 100644
--- a/sys/net/netisr.c
+++ b/sys/net/netisr.c
@@ -53,10 +53,11 @@
 #include <net/if_var.h>
 #include <net/netisr.h>
 
-/*
- * XXX this is a temporary measure to allow folks to
- * XXX disable Giant locking in the network code without
- * XXX recompiling--in case of problems.
+/* 
+ * debug_mpsafenet controls network subsystem-wide use of the Giant lock,
+ * from system calls down to interrupt handlers.  It can be changed only
+ * via a tunable at boot, not at run-time, due to the complexity of
+ * unwinding.
  */
 int	debug_mpsafenet = 0;
 TUNABLE_INT("debug.mpsafenet", &debug_mpsafenet);
-- 
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