From 2e2d14c235b570a6beb222fc1bfa53de85a98de3 Mon Sep 17 00:00:00 2001
From: Frans Kaashoek <kaashoek@mit.edu>
Date: Wed, 1 Feb 2017 19:21:43 -0500
Subject: [PATCH] use panic

---
 console.c | 3 ++-
 proc.c    | 8 ++------
 2 files changed, 4 insertions(+), 7 deletions(-)

diff --git a/console.c b/console.c
index f7e1e73..da28f9f 100644
--- a/console.c
+++ b/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);
diff --git a/proc.c b/proc.c
index 9f500f2..ca343cb 100644
--- a/proc.c
+++ b/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()];
 }