Author: jchandra
Date: Sun Aug 8 12:23:02 2010
New Revision: 211068
URL: http://svn.freebsd.org/changeset/base/211068
Log:
loadandclear() for PTEs are not needed on MIPS. The PTEs are software
managed and we already take pmap lock for PTE operations(see r210922)
Reviewed by: alc
Modified:
head/sys/mips/mips/pmap.c
Modified: head/sys/mips/mips/pmap.c
==============================================================================
--- head/sys/mips/mips/pmap.c Sun Aug 8 12:19:49 2010 (r211067)
+++ head/sys/mips/mips/pmap.c Sun Aug 8 12:23:02 2010 (r211068)
@@ -1352,9 +1352,11 @@ retry:
pmap->pm_stats.resident_count--;
pte = pmap_pte(pmap, va);
KASSERT(pte != NULL, ("pte"));
- oldpte = loadandclear((u_int *)pte);
+ oldpte = *pte;
if (is_kernel_pmap(pmap))
*pte = PTE_G;
+ else
+ *pte = 0;
KASSERT(!pte_test(&oldpte, PTE_W),
("wired pte for unwired page"));
if (m->md.pv_flags & PV_TABLE_REF)
@@ -1494,9 +1496,11 @@ pmap_remove_pte(struct pmap *pmap, pt_en
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
- oldpte = loadandclear((u_int *)ptq);
+ oldpte = *ptq;
if (is_kernel_pmap(pmap))
*ptq = PTE_G;
+ else
+ *ptq = 0;
if (pte_test(&oldpte, PTE_W))
pmap->pm_stats.wired_count -= 1;
@@ -1657,9 +1661,11 @@ pmap_remove_all(vm_page_t m)
pte = pmap_pte(pv->pv_pmap, pv->pv_va);
- tpte = loadandclear((u_int *)pte);
+ tpte = *pte;
if (is_kernel_pmap(pv->pv_pmap))
*pte = PTE_G;
+ else
+ *pte = 0;
if (pte_test(&tpte, PTE_W))
pv->pv_pmap->pm_stats.wired_count--;
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