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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Tue, 24 Mar 2015 17:42:54 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r280450 - head/sys/kern
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Author: hselasky
Date: Tue Mar 24 17:42:53 2015
New Revision: 280450
URL: https://svnweb.freebsd.org/changeset/base/280450

Log:
  Make sure tunable sysctls are only fetched once. The existing code can
  re-register sysctls when destroying sysctl contexts or when moving
  sysctls from one tree to another.

Modified:
  head/sys/kern/kern_sysctl.c

Modified: head/sys/kern/kern_sysctl.c
==============================================================================
--- head/sys/kern/kern_sysctl.c	Tue Mar 24 17:37:31 2015	(r280449)
+++ head/sys/kern/kern_sysctl.c	Tue Mar 24 17:42:53 2015	(r280450)
@@ -353,6 +353,9 @@ sysctl_register_oid(struct sysctl_oid *o
 #endif
 	    (oidp->oid_kind & CTLFLAG_TUN) != 0 &&
 	    (oidp->oid_kind & CTLFLAG_NOFETCH) == 0) {
+		/* only fetch value once */
+		oidp->oid_kind |= CTLFLAG_NOFETCH;
+		/* try to fetch value from kernel environment */
 		sysctl_load_tunable_by_oid_locked(oidp);
 	}
 }