diff options
| -rw-r--r-- | sys/mips/mips/pmap.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/mips/mips/pmap.c b/sys/mips/mips/pmap.c index 5b3888e..d00f1a3 100644 --- a/sys/mips/mips/pmap.c +++ b/sys/mips/mips/pmap.c @@ -765,6 +765,7 @@ pmap_extract(pmap_t pmap, vm_offset_t va) vm_page_t pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) { + pt_entry_t *ptep; pt_entry_t pte; vm_page_t m; vm_paddr_t pa; @@ -773,8 +774,9 @@ pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) pa = 0; PMAP_LOCK(pmap); retry: - pte = *pmap_pte(pmap, va); - if (pte != 0 && pte_test(&pte, PTE_V) && + ptep = pmap_pte(pmap, va); + if ((ptep != NULL) && ((pte = *ptep) != 0) && + pte_test(&pte, PTE_V) && (pte_test(&pte, PTE_D) || (prot & VM_PROT_WRITE) == 0)) { if (vm_page_pa_tryrelock(pmap, TLBLO_PTE_TO_PA(pte), &pa)) goto retry; |
