use panic

console.c

@@ -111,7 +111,8 @@ panic(char *s)
 
   cli();
   cons.locking = 0;
-  cprintf("cpu %d: panic: ", cpuid());
+  // use lapiccpunum so that we can call panic from mycpu()
+  cprintf("cpu %d: panic: ", lapiccpunum());
   cprintf(s);
   cprintf("\n");
   getcallerpcs(&s, pcs);

proc.c

@@ -36,12 +36,8 @@ cpuid() {
 struct cpu*
 mycpu(void)
 {
-  if(readeflags()&FL_IF){
-    // Would prefer to panic but panic calls mycpu().
-    cprintf("mycpu called from %x with interrupts enabled\n",
-        __builtin_return_address(0));
-  }
-
+  if(readeflags()&FL_IF)
+    panic("mycpu called with interrupts enabled\n");
   return &cpus[lapiccpunum()];
 }