handle another out-of-memory in fork(). the policy here is not consistent,

since other calls (e.g. exec()) panic on out of memory.

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/vm.c b/kernel/vm.c
index 92a5ff7..2f3789f 100644
--- a/kernel/vm.c
+++ b/kernel/vm.c
@@ -195,13 +195,14 @@ uvmunmap(pagetable_t pagetable, uint64 va, uint64 npages, int do_free)
 }
 
 // create an empty user page table.
+// returns 0 if out of memory.
 pagetable_t
 uvmcreate()
 {
   pagetable_t pagetable;
   pagetable = (pagetable_t) kalloc();
   if(pagetable == 0)
-    panic("uvmcreate: out of memory");
+    return 0;
   memset(pagetable, 0, PGSIZE);
   return pagetable;
 }