diff options
-rw-r--r-- | vm.c | 16 |
1 files changed, 8 insertions, 8 deletions
@@ -310,14 +310,14 @@ copyuvm(pde_t *pgdir, uint sz) for(i = 0; i < sz; i += PGSIZE){ if(!(pte = walkpgdir(pgdir, (void *)i, 0))) panic("copyuvm: pte should exist\n"); - if(*pte & PTE_P){ - pa = PTE_ADDR(*pte); - if(!(mem = kalloc())) - goto bad; - memmove(mem, (char *)pa, PGSIZE); - if(!mappages(d, (void *)i, PGSIZE, PADDR(mem), PTE_W|PTE_U)) - goto bad; - } + if(!(*pte & PTE_P)) + panic("copyuvm: page not present\n"); + pa = PTE_ADDR(*pte); + if(!(mem = kalloc())) + goto bad; + memmove(mem, (char *)pa, PGSIZE); + if(!mappages(d, (void *)i, PGSIZE, PADDR(mem), PTE_W|PTE_U)) + goto bad; } return d; |