Author: alc
Date: Sun Apr 19 00:34:34 2009
New Revision: 191256
URL: http://svn.freebsd.org/changeset/base/191256
Log:
Allow valid pages to be mapped for read access when they have a non-zero
busy count. Only mappings that allow write access should be prevented by
a non-zero busy count.
(The prohibition on mapping pages for read access when they have a non-
zero busy count originated in revision 1.202 of i386/i386/pmap.c when
this code was a part of the pmap.)
Reviewed by: tegge
Modified:
head/sys/vm/vm_fault.c
head/sys/vm/vm_map.c
Modified: head/sys/vm/vm_fault.c
==============================================================================
--- head/sys/vm/vm_fault.c Sun Apr 19 00:16:04 2009 (r191255)
+++ head/sys/vm/vm_fault.c Sun Apr 19 00:34:34 2009 (r191256)
@@ -1027,7 +1027,6 @@ vm_fault_prefault(pmap_t pmap, vm_offset
break;
}
if (((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
- (m->busy == 0) &&
(m->flags & PG_FICTITIOUS) == 0) {
vm_page_lock_queues();
Modified: head/sys/vm/vm_map.c
==============================================================================
--- head/sys/vm/vm_map.c Sun Apr 19 00:16:04 2009 (r191255)
+++ head/sys/vm/vm_map.c Sun Apr 19 00:34:34 2009 (r191256)
@@ -1683,8 +1683,7 @@ vm_map_pmap_enter(vm_map_t map, vm_offse
psize = tmpidx;
break;
}
- if ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL &&
- (p->busy == 0)) {
+ if ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) {
if (p_start == NULL) {
start = addr + ptoa(tmpidx);
p_start = p;
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