Author: kmacy
Date: Sun Feb 8 21:54:51 2009
New Revision: 188341
URL: http://svn.freebsd.org/changeset/base/188341
Log:
Don't try to directly update page tables
Modified:
head/sys/i386/xen/pmap.c
Modified: head/sys/i386/xen/pmap.c
==============================================================================
--- head/sys/i386/xen/pmap.c Sun Feb 8 21:50:47 2009 (r188340)
+++ head/sys/i386/xen/pmap.c Sun Feb 8 21:54:51 2009 (r188341)
@@ -3713,14 +3713,17 @@ pmap_remove_write(vm_page_t m)
retry:
oldpte = *pte;
if ((oldpte & PG_RW) != 0) {
+ vm_paddr_t newpte = oldpte & ~(PG_RW | PG_M);
+
/*
* Regardless of whether a pte is 32 or 64 bits
* in size, PG_RW and PG_M are among the least
* significant 32 bits.
*/
- if (!atomic_cmpset_int((u_int *)pte, oldpte,
- oldpte & ~(PG_RW | PG_M)))
+ PT_SET_VA_MA(pte, newpte, TRUE);
+ if (*pte != newpte)
goto retry;
+
if ((oldpte & PG_M) != 0)
vm_page_dirty(m);
pmap_invalidate_page(pmap, pv->pv_va);
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