diff -purN 60_pipe_aio/include/asm-um/mmu_context.h test.diff/include/asm-um/mmu_context.h
--- 60_pipe_aio/include/asm-um/mmu_context.h	2004-12-24 16:34:57.000000000 -0500
+++ test.diff/include/asm-um/mmu_context.h	2005-07-05 14:38:34.569235552 -0400
@@ -14,8 +14,12 @@
 
 #define deactivate_mm(tsk,mm)	do { } while (0)
 
+extern void force_flush_all(void);
+
 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
 {
+	if (old != new)
+		force_flush_all();
 }
 
 extern void switch_mm_skas(int mm_fd);