--- zzzz-none-000/linux-2.4.17/include/asm-sh/mmu_context.h	2001-09-08 19:29:09.000000000 +0000
+++ sangam-fb-322/linux-2.4.17/include/asm-sh/mmu_context.h	2004-11-24 13:21:34.000000000 +0000
@@ -166,6 +166,10 @@
 				 struct mm_struct *next,
 				 struct task_struct *tsk, unsigned int cpu)
 {
+#ifdef CONFIG_PREEMPT
+	if (preempt_is_disabled() == 0)
+		BUG();
+#endif
 	if (prev != next) {
 		unsigned long __pgdir = (unsigned long)next->pgd;