Merge pull request #24 from wuzhy/master

fix a building error

1 files changed, 2 insertions, 2 deletions

diff --git a/v/vm.c b/v/vm.c
index 6bf05f7..71700f5 100644
--- a/v/vm.c
+++ b/v/vm.c
@@ -17,8 +17,8 @@
 void trap_entry();
 void pop_tf(trapframe_t*);
 
-volatile uint64_t tohost;
-volatile uint64_t fromhost;
+extern volatile uint64_t tohost;
+extern volatile uint64_t fromhost;
 
 static void do_tohost(uint64_t tohost_value)
 {