Slight simplification of copyuvm. We could simplify other things now that…

Slight simplification of copyuvm. We could simplify other things now that processes are contiguous, but we'd have to think harder about the error paths.

Slight simplification of copyuvm. We could simplify other things now that…
d3ecf3eb · Austin Clements · b1d41d67 · d3ecf3eb
--- a/vm.c
+++ b/vm.c
@@ -310,7 +310,8 @@ 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){
+    if(!(*pte & PTE_P))
+      panic("copyuvm: page not present\n");
    pa = PTE_ADDR(*pte);
    if(!(mem = kalloc()))
      goto bad;
@@ -318,7 +319,6 @@ copyuvm(pde_t *pgdir, uint sz)
    if(!mappages(d, (void *)i, PGSIZE, PADDR(mem), PTE_W|PTE_U))
      goto bad;
  }
-  }
  return d;

 bad: