Author: kib
Date: Sun Feb 8 20:52:09 2009
New Revision: 188335
URL: http://svn.freebsd.org/changeset/base/188335
Log:
Improve comments, correct English.
Submitted by: alc
Modified:
head/sys/vm/vm_map.c
Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c Sun Feb 8 20:39:17 2009 (r188334)
+++ head/sys/vm/vm_map.c Sun Feb 8 20:52:09 2009 (r188335)
@@ -1355,13 +1355,13 @@ vm_map_simplify_entry(vm_map_t map, vm_m
vm_map_entry_resize_free(map, entry->prev);
/*
- * If the backing object is the vnode object,
- * vm_object_deallocate() results in a call to
- * vrele(). Because the reference to the
- * object is not last, vrele() does not lock
- * the vnode, and map lock can be kept without
- * causing vnode lock to be taken after the
- * map lock.
+ * If the backing object is a vnode object,
+ * vm_object_deallocate() calls vrele().
+ * However, vrele() does not lock the vnode
+ * because the vnode has additional
+ * references. Thus, the map lock can be kept
+ * without causing a lock-order reversal with
+ * the vnode lock.
*/
if (prev->object.vm_object)
vm_object_deallocate(prev->object.vm_object);
@@ -2778,7 +2778,7 @@ vmspace_fork(struct vmspace *vm1)
/*
* As in vm_map_simplify_entry(), the
- * vnode lock may not be acquired in
+ * vnode lock will not be acquired in
* this call to vm_object_deallocate().
*/
vm_object_deallocate(object);
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