Author: alc
Date: Sat Oct 30 17:21:32 2010
New Revision: 214563
URL: http://svn.freebsd.org/changeset/base/214563
Log:
Don't demote in pmap_demote_DMAP() if the specified length is zero.
Modified:
head/sys/amd64/amd64/pmap.c
Modified: head/sys/amd64/amd64/pmap.c
==============================================================================
--- head/sys/amd64/amd64/pmap.c Sat Oct 30 16:53:42 2010 (r214562)
+++ head/sys/amd64/amd64/pmap.c Sat Oct 30 17:21:32 2010 (r214563)
@@ -4968,6 +4968,11 @@ pmap_demote_DMAP(vm_paddr_t base, vm_siz
vm_offset_t va;
boolean_t changed;
+ if (len == 0)
+ return;
+ KASSERT(powerof2(len), ("pmap_demote_DMAP: len is not a power of 2"));
+ KASSERT((base & (len - 1)) == 0,
+ ("pmap_demote_DMAP: base is not a multiple of len"));
if (len < NBPDP) {
va = PHYS_TO_DMAP(base);
changed = FALSE;
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