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From: Tim Kientzle <kientzle@FreeBSD.org>
Date: Thu, 25 Jul 2013 03:48:37 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r253636 - head/sys/vm
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Author: kientzle
Date: Thu Jul 25 03:48:37 2013
New Revision: 253636
URL: http://svnweb.freebsd.org/changeset/base/253636

Log:
  Clear entire map structure including locks so that the
  locks don't accidentally appear to have been already
  initialized.
  
  In particular, this fixes a consistent kernel crash on
  armv6 with:
    panic: lock "vm map (user)" 0xc09cc050 already initialized
  that appeared with r251709.
  
  PR: arm/180820

Modified:
  head/sys/vm/vm_map.c

Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c	Thu Jul 25 03:44:12 2013	(r253635)
+++ head/sys/vm/vm_map.c	Thu Jul 25 03:48:37 2013	(r253636)
@@ -239,8 +239,7 @@ vm_map_zinit(void *mem, int size, int fl
 	vm_map_t map;
 
 	map = (vm_map_t)mem;
-	map->nentries = 0;
-	map->size = 0;
+	memset(map, 0, sizeof(*map));
 	mtx_init(&map->system_mtx, "vm map (system)", NULL, MTX_DEF | MTX_DUPOK);
 	sx_init(&map->lock, "vm map (user)");
 	return (0);