3 files changed, 19 insertions, 81 deletions

diff --git a/arch/s390/oprofile/Makefile b/arch/s390/oprofile/Makefile
index 1bd23017191e..496e4a7ee00e 100644
--- a/arch/s390/oprofile/Makefile
+++ b/arch/s390/oprofile/Makefile
@@ -6,5 +6,5 @@ DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
 		oprofilefs.o oprofile_stats.o  \
 		timer_int.o )
 
-oprofile-y :=	$(DRIVER_OBJS) init.o backtrace.o
+oprofile-y :=	$(DRIVER_OBJS) init.o
 oprofile-y +=	hwsampler.o
diff --git a/arch/s390/oprofile/backtrace.c b/arch/s390/oprofile/backtrace.c
deleted file mode 100644
index 1884e1759529..000000000000
--- a/arch/s390/oprofile/backtrace.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- * S390 Version
- *   Copyright IBM Corp. 2005
- *   Author(s): Andreas Krebbel <Andreas.Krebbel@de.ibm.com>
- */
-
-#include <linux/oprofile.h>
-
-#include <asm/processor.h> /* for struct stack_frame */
-
-static unsigned long
-__show_trace(unsigned int *depth, unsigned long sp,
-	     unsigned long low, unsigned long high)
-{
-	struct stack_frame *sf;
-	struct pt_regs *regs;
-
-	while (*depth) {
-		if (sp < low || sp > high - sizeof(*sf))
-			return sp;
-		sf = (struct stack_frame *) sp;
-		(*depth)--;
-		oprofile_add_trace(sf->gprs[8]);
-
-		/* Follow the backchain.  */
-		while (*depth) {
-			low = sp;
-			sp = sf->back_chain;
-			if (!sp)
-				break;
-			if (sp <= low || sp > high - sizeof(*sf))
-				return sp;
-			sf = (struct stack_frame *) sp;
-			(*depth)--;
-			oprofile_add_trace(sf->gprs[8]);
-
-		}
-
-		if (*depth == 0)
-			break;
-
-		/* Zero backchain detected, check for interrupt frame.  */
-		sp = (unsigned long) (sf + 1);
-		if (sp <= low || sp > high - sizeof(*regs))
-			return sp;
-		regs = (struct pt_regs *) sp;
-		(*depth)--;
-		oprofile_add_trace(sf->gprs[8]);
-		low = sp;
-		sp = regs->gprs[15];
-	}
-	return sp;
-}
-
-void s390_backtrace(struct pt_regs * const regs, unsigned int depth)
-{
-	unsigned long head, frame_size;
-	struct stack_frame* head_sf;
-
-	if (user_mode(regs))
-		return;
-
-	frame_size = STACK_FRAME_OVERHEAD + sizeof(struct pt_regs);
-	head = regs->gprs[15];
-	head_sf = (struct stack_frame*)head;
-
-	if (!head_sf->back_chain)
-		return;
-
-	head = head_sf->back_chain;
-
-	head = __show_trace(&depth, head,
-			    S390_lowcore.async_stack + frame_size - ASYNC_SIZE,
-			    S390_lowcore.async_stack + frame_size);
-
-	__show_trace(&depth, head, S390_lowcore.thread_info,
-		     S390_lowcore.thread_info + THREAD_SIZE);
-}
diff --git a/arch/s390/oprofile/init.c b/arch/s390/oprofile/init.c
index 9cfa2ffaa9d6..d85d1e6b1988 100644
--- a/arch/s390/oprofile/init.c
+++ b/arch/s390/oprofile/init.c
@@ -20,8 +20,6 @@
 
 #include "../../../drivers/oprofile/oprof.h"
 
-extern void s390_backtrace(struct pt_regs * const regs, unsigned int depth);
-
 #include "hwsampler.h"
 #include "op_counter.h"
 
@@ -494,6 +492,24 @@ static void oprofile_hwsampler_exit(void)
 	hwsampler_shutdown();
 }
 
+static int __s390_backtrace(void *data, unsigned long address)
+{
+	unsigned int *depth = data;
+
+	if (*depth == 0)
+		return 1;
+	(*depth)--;
+	oprofile_add_trace(address);
+	return 0;
+}
+
+static void s390_backtrace(struct pt_regs *regs, unsigned int depth)
+{
+	if (user_mode(regs))
+		return;
+	dump_trace(__s390_backtrace, &depth, NULL, regs->gprs[15]);
+}
+
 int __init oprofile_arch_init(struct oprofile_operations *ops)
 {
 	ops->backtrace = s390_backtrace;