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, 2 insertions, 1 deletions

diff --git a/kalloc.c b/kalloc.c
index c13a639..989e3e8 100644
--- a/kalloc.c
+++ b/kalloc.c
@@ -15,7 +15,7 @@
 #include "proc.h"
 #include "spinlock.h"
 
-struct spinlock kalloc_lock = { "kalloc" };
+struct spinlock kalloc_lock;
 
 struct run {
   struct run *next;
@@ -37,6 +37,7 @@ kinit(void)
   uint mem;
   char *start;
   
+  initlock(&kalloc_lock, "kalloc");
   start = (char *) &end;
   start = (char *) (((uint)start + PAGE) & ~(PAGE-1));
   mem = 256; // XXX