diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
index 9a0ac85946dbf40429d6adf3e6e5d90bf7b5ce33..f97621149839dab962d2be9e254aa728e433dbef 100644
--- a/arch/x86/kernel/entry_32.S
+++ b/arch/x86/kernel/entry_32.S
@@ -1217,12 +1217,9 @@ trace_return:
 	pushl %eax
 	pushl %ecx
 	pushl %edx
-	movl 0xc(%esp), %eax
-	pushl %eax
+	movl 0xc(%esp), %edx
 	lea 0x4(%ebp), %eax
-	pushl %eax
 	call prepare_ftrace_return
-	addl $8, %esp
 	popl %edx
 	popl %ecx
 	popl %eax
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 16a571dea2ef73243ee844395ffc3ec5bd2a946c..fe832738e1e2794beb45a18b9a9424946b3d8f61 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -44,62 +44,37 @@ void ftrace_nmi_exit(void)
 	atomic_dec(&in_nmi);
 }
 
-/*
- * Synchronize accesses to return adresses stack with
- * interrupts.
- */
-static raw_spinlock_t ret_stack_lock;
-
 /* Add a function return address to the trace stack on thread info.*/
 static int push_return_trace(unsigned long ret, unsigned long long time,
 				unsigned long func)
 {
 	int index;
-	struct thread_info *ti;
-	unsigned long flags;
-	int err = 0;
-
-	raw_local_irq_save(flags);
-	__raw_spin_lock(&ret_stack_lock);
+	struct thread_info *ti = current_thread_info();
 
-	ti = current_thread_info();
 	/* The return trace stack is full */
-	if (ti->curr_ret_stack == FTRACE_RET_STACK_SIZE - 1) {
-		err = -EBUSY;
-		goto out;
-	}
+	if (ti->curr_ret_stack == FTRACE_RET_STACK_SIZE - 1)
+		return -EBUSY;
 
 	index = ++ti->curr_ret_stack;
 	ti->ret_stack[index].ret = ret;
 	ti->ret_stack[index].func = func;
 	ti->ret_stack[index].calltime = time;
 
-out:
-	__raw_spin_unlock(&ret_stack_lock);
-	raw_local_irq_restore(flags);
-	return err;
+	return 0;
 }
 
 /* Retrieve a function return address to the trace stack on thread info.*/
 static void pop_return_trace(unsigned long *ret, unsigned long long *time,
 				unsigned long *func)
 {
-	struct thread_info *ti;
 	int index;
-	unsigned long flags;
-
-	raw_local_irq_save(flags);
-	__raw_spin_lock(&ret_stack_lock);
 
-	ti = current_thread_info();
+	struct thread_info *ti = current_thread_info();
 	index = ti->curr_ret_stack;
 	*ret = ti->ret_stack[index].ret;
 	*func = ti->ret_stack[index].func;
 	*time = ti->ret_stack[index].calltime;
 	ti->curr_ret_stack--;
-
-	__raw_spin_unlock(&ret_stack_lock);
-	raw_local_irq_restore(flags);
 }
 
 /*
@@ -120,7 +95,6 @@ unsigned long ftrace_return_to_handler(void)
  * Hook the return address and push it in the stack of return addrs
  * in current thread info.
  */
-asmlinkage
 void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
 {
 	unsigned long old;
@@ -175,14 +149,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
 		*parent = old;
 }
 
-static int __init init_ftrace_function_return(void)
-{
-	ret_stack_lock = (raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
-	return 0;
-}
-device_initcall(init_ftrace_function_return);
-
-
 #endif
 
 #ifdef CONFIG_DYNAMIC_FTRACE
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 86dc353f89b99cfe66c01c9348052cab0e06f91d..2d6c2cf0c3bcc7087a77bd3d85e2e7640d18f9be 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -53,8 +53,14 @@ void tracing_off(void)
 /* FIXME!!! */
 u64 ring_buffer_time_stamp(int cpu)
 {
+	u64 time;
+
+	preempt_disable_notrace();
 	/* shift to debug/test normalization and TIME_EXTENTS */
-	return sched_clock() << DEBUG_SHIFT;
+	time = sched_clock() << DEBUG_SHIFT;
+	preempt_enable_notrace();
+
+	return time;
 }
 
 void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
diff --git a/scripts/bootgraph.pl b/scripts/bootgraph.pl
index d2c61efc216f4bd413dd271faa3aa62c736c6203..a8635a10fef28fa165df0aa4cb2ab545135042d3 100644
--- a/scripts/bootgraph.pl
+++ b/scripts/bootgraph.pl
@@ -109,8 +109,8 @@ my $stylecounter = 0;
 my %rows;
 my $rowscount = 1;
 my @initcalls = sort { $start{$a} <=> $start{$b} } keys(%start);
-my $key;
-foreach $key (@initcalls) {
+
+foreach my $key (@initcalls) {
 	my $duration = $end{$key} - $start{$key};
 
 	if ($duration >= $threshold) {