[S390] oprofile: disable hw sampling for CONFIG_32BIT

Doesn't work and build for CONFIG_32BIT. So disable it.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/oprofile/Makefile

@@ -6,4 +6,5 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
 		oprofilefs.o oprofile_stats.o  \
 		timer_int.o )
 
-oprofile-y :=	$(DRIVER_OBJS) init.o backtrace.o hwsampler.o
+oprofile-y :=	$(DRIVER_OBJS) init.o backtrace.o
+oprofile-$(CONFIG_64BIT)	+= hwsampler.o

arch/s390/oprofile/init.c

@@ -18,6 +18,11 @@
 #include <linux/fs.h>
 
 #include "../../../drivers/oprofile/oprof.h"
+
+extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth);
+
+#ifdef CONFIG_64BIT
+
 #include "hwsampler.h"
 
 #define DEFAULT_INTERVAL	4096
@@ -37,8 +42,6 @@ static int hwsampler_running;	/* start_mutex must be held to change */
 
 static struct oprofile_operations timer_ops;
 
-extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth);
-
 static int oprofile_hwsampler_start(void)
 {
 	int retval;
@@ -172,14 +175,22 @@ static void oprofile_hwsampler_exit(void)
 	hwsampler_shutdown();
 }
 
+#endif /* CONFIG_64BIT */
+
 int __init oprofile_arch_init(struct oprofile_operations *ops)
 {
 	ops->backtrace = s390_backtrace;
 
+#ifdef CONFIG_64BIT
 	return oprofile_hwsampler_init(ops);
+#else
+	return -ENODEV;
+#endif
 }
 
 void oprofile_arch_exit(void)
 {
+#ifdef CONFIG_64BIT
 	oprofile_hwsampler_exit();
+#endif
 }