Fix a leak of the wired pages when unwiring of the PROT_NONE-mapped

wired region.  Rework the handling of unwire to do the it in batch,
both at pmap and object level.

All commits below are by alc.

MFC r268327:
Introduce pmap_unwire().

MFC r268591:
Implement pmap_unwire() for powerpc.

MFC r268776:
Implement pmap_unwire() for arm.

MFC r268806:
pmap_unwire(9) man page.

MFC r269134:
When unwiring a region of an address space, do not assume that the
underlying physical pages are mapped by the pmap.  This fixes a leak
of the wired pages on the unwiring of the region mapped with no access
allowed.

MFC r269339:
In the implementation of the new function pmap_unwire(), the call to
MOEA64_PVO_TO_PTE() must be performed before any changes are made to the
PVO. Otherwise, MOEA64_PVO_TO_PTE() will panic.

MFC r269365:
Correct a long-standing problem in moea{,64}_pvo_enter() that was revealed
by the combination of r268591 and r269134: When we attempt to add the
wired attribute to an existing mapping, moea{,64}_pvo_enter() do nothing.
(They only set the wired attribute on newly created mappings.)

MFC r269433:
Handle wiring failures in vm_map_wire() with the new functions
pmap_unwire() and vm_object_unwire().
Retire vm_fault_{un,}wire(), since they are no longer used.

MFC r269438:
Rewrite a loop in vm_map_wire() so that gcc doesn't think that the variable
"rv" is uninitialized.

MFC r269485:
Retire pmap_change_wiring().

Reviewed by:	alc

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/vm/pmap.h b/sys/vm/pmap.h
index 2e7b19d..d73babc 100644
--- a/sys/vm/pmap.h
+++ b/sys/vm/pmap.h
@@ -109,7 +109,6 @@ void		 pmap_advise(pmap_t pmap, vm_offset_t sva, vm_offset_t eva,
 		    int advice);
 void		 pmap_align_superpage(vm_object_t, vm_ooffset_t, vm_offset_t *,
 		    vm_size_t);
-void		 pmap_change_wiring(pmap_t, vm_offset_t, boolean_t);
 void		 pmap_clear_modify(vm_page_t m);
 void		 pmap_copy(pmap_t, pmap_t, vm_offset_t, vm_size_t, vm_offset_t);
 void		 pmap_copy_page(vm_page_t, vm_page_t);
@@ -149,6 +148,7 @@ void		 pmap_remove_pages(pmap_t);
 void		 pmap_remove_write(vm_page_t m);
 void		 pmap_sync_icache(pmap_t, vm_offset_t, vm_size_t);
 boolean_t	 pmap_ts_referenced(vm_page_t m);
+void		 pmap_unwire(pmap_t pmap, vm_offset_t start, vm_offset_t end);
 void		 pmap_zero_page(vm_page_t);
 void		 pmap_zero_page_area(vm_page_t, int off, int size);
 void		 pmap_zero_page_idle(vm_page_t);