From adee82c3e7334a09996c0fe9cc75d9a80abc81c8 Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Thu, 13 Aug 2020 10:22:07 -0400
Subject: handle another out-of-memory in fork(). the policy here is not
consistent, since other calls (e.g. exec()) panic on out of memory.
---
kernel/vm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
(limited to 'kernel/vm.c')
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;
}
--
cgit v1.2.3