interrupts could be recursive since lapic_eoi() called before rti

so fast interrupts overflow the kernel stack
fix: cli() before lapic_eoi()

1 files changed, 7 insertions, 1 deletions

diff --git a/bio.c b/bio.c
index f847c2e..2b17a52 100644
--- a/bio.c
+++ b/bio.c
@@ -8,7 +8,13 @@
 #include "buf.h"
 
 struct buf buf[NBUF];
-struct spinlock buf_table_lock = { "buf_table" };
+struct spinlock buf_table_lock;
+
+void
+binit(void)
+{
+  initlock(&buf_table_lock, "buf_table");
+}
 
 struct buf *
 getblk()