--- a/arch/s390/kernel/signal.c	2005-03-22 11:07:39.000000000 +0100
+++ b/arch/s390/kernel/signal.c	2005-03-22 11:08:44.000000000 +0100
@@ -285,7 +285,7 @@
 
 	/* This is the X/Open sanctioned signal stack switching.  */
 	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (! on_sig_stack(sp))
+		if (! sas_ss_flags(sp))
 			sp = current->sas_ss_sp + current->sas_ss_size;
 	}