Author: kib
Date: Fri Jul 13 21:23:03 2018
New Revision: 336265
URL: https://svnweb.freebsd.org/changeset/base/336265
Log:
MFC r336030:
Save a call to pmap_remove() if entry cannot have any pages mapped.
Modified:
stable/11/sys/vm/vm_map.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/vm/vm_map.c
==============================================================================
--- stable/11/sys/vm/vm_map.c Fri Jul 13 21:03:32 2018 (r336264)
+++ stable/11/sys/vm/vm_map.c Fri Jul 13 21:23:03 2018 (r336265)
@@ -3099,7 +3099,14 @@ vm_map_delete(vm_map_t map, vm_offset_t start, vm_offs
if (entry->wired_count != 0)
vm_map_entry_unwire(map, entry);
- pmap_remove(map->pmap, entry->start, entry->end);
+ /*
+ * Remove mappings for the pages, but only if the
+ * mappings could exist. For instance, it does not
+ * make sense to call pmap_remove() for guard entries.
+ */
+ if ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0 ||
+ entry->object.vm_object != NULL)
+ pmap_remove(map->pmap, entry->start, entry->end);
/*
* Delete the entry only after removing all pmap
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