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- Tell witness that holding two or more vm_object locks is okay.

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- In vm_object_deallocate(), lock the child when removing the parent
   from the child's shadow list.
This commit is contained in:
Alan Cox 2003-04-27 20:07:57 +00:00
parent ebd194173e
commit c9917419ef
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=114128
1 changed files with 4 additions and 2 deletions
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6
sys/vm/vm_object.c
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@ -193,7 +193,7 @@ _vm_object_allocate(objtype_t type, vm_pindex_t size, vm_object_t object)
{
int incr;
mtx_init(&object->mtx, "vm object", NULL, MTX_DEF);
mtx_init(&object->mtx, "vm object", NULL, MTX_DEF | MTX_DUPOK);
TAILQ_INIT(&object->memq);
TAILQ_INIT(&object->shadow_head);
@ -504,10 +504,12 @@ vm_object_deallocate(vm_object_t object)
doterm:
VM_OBJECT_LOCK(object);
temp = object->backing_object;
if (temp) {
if (temp != NULL) {
VM_OBJECT_LOCK(temp);
TAILQ_REMOVE(&temp->shadow_head, object, shadow_list);
temp->shadow_count--;
temp->generation++;
VM_OBJECT_UNLOCK(temp);
object->backing_object = NULL;
}
/*