tracing/stack-tracer: fix style issues

Impact: cleanup

Signed-off-by: Török Edwin <edwintorok@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/stacktrace.c

@@ -89,7 +89,7 @@ EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
 
 struct stack_frame {
 	const void __user	*next_fp;
-	unsigned long		return_address;
+	unsigned long		ret_addr;
 };
 
 static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
@@ -108,33 +108,40 @@ static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
 	return ret;
 }
 
+static inline void __save_stack_trace_user(struct stack_trace *trace)
+{
+	const struct pt_regs *regs = task_pt_regs(current);
+	const void __user *fp = (const void __user *)regs->bp;
+
+	if (trace->nr_entries < trace->max_entries)
+		trace->entries[trace->nr_entries++] = regs->ip;
+
+	while (trace->nr_entries < trace->max_entries) {
+		struct stack_frame frame;
+
+		frame.next_fp = NULL;
+		frame.ret_addr = 0;
+		if (!copy_stack_frame(fp, &frame))
+			break;
+		if ((unsigned long)fp < regs->sp)
+			break;
+		if (frame.ret_addr) {
+			trace->entries[trace->nr_entries++] =
+				frame.ret_addr;
+		}
+		if (fp == frame.next_fp)
+			break;
+		fp = frame.next_fp;
+	}
+}
+
 void save_stack_trace_user(struct stack_trace *trace)
 {
 	/*
 	 * Trace user stack if we are not a kernel thread
 	 */
 	if (current->mm) {
-		const struct pt_regs *regs = task_pt_regs(current);
-		const void __user *fp = (const void __user *)regs->bp;
-
-		if (trace->nr_entries < trace->max_entries)
-			trace->entries[trace->nr_entries++] = regs->ip;
-
-		while (trace->nr_entries < trace->max_entries) {
-			struct stack_frame frame;
-			frame.next_fp = NULL;
-			frame.return_address = 0;
-			if (!copy_stack_frame(fp, &frame))
-				break;
-			if ((unsigned long)fp < regs->sp)
-				break;
-			if (frame.return_address)
-				trace->entries[trace->nr_entries++] =
-					frame.return_address;
-			if (fp == frame.next_fp)
-				break;
-			fp = frame.next_fp;
-		}
+		__save_stack_trace_user(trace);
 	}
 	if (trace->nr_entries < trace->max_entries)
 		trace->entries[trace->nr_entries++] = ULONG_MAX;

include/linux/stacktrace.h

@@ -25,7 +25,7 @@ extern void save_stack_trace_user(struct stack_trace *trace);
 #else
 # define save_stack_trace(trace)			do { } while (0)
 # define save_stack_trace_tsk(tsk, trace)		do { } while (0)
-# define save_stack_trace_user(trace)              do { } while (0)
+# define save_stack_trace_user(trace)			do { } while (0)
 # define print_stack_trace(trace, spaces)		do { } while (0)
 #endif
 

kernel/trace/trace.c

@@ -948,9 +948,9 @@ static void ftrace_trace_userstack(struct trace_array *tr,
 		   struct trace_array_cpu *data,
 		   unsigned long flags, int pc)
 {
+	struct ring_buffer_event *event;
 	struct userstack_entry *entry;
 	struct stack_trace trace;
-	struct ring_buffer_event *event;
 	unsigned long irq_flags;
 
 	if (!(trace_flags & TRACE_ITER_USERSTACKTRACE))
@@ -1471,8 +1471,7 @@ static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
 	if (file) {
 		ret = trace_seq_path(s, &file->f_path);
 		if (ret)
-			ret = trace_seq_printf(s, "[+0x%lx]",
-					ip - vmstart);
+			ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
 	}
 	if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
 		ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
@@ -1485,7 +1484,7 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 {
 	struct mm_struct *mm = NULL;
 	int ret = 1;
-	unsigned i;
+	unsigned int i;
 
 	if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
 		struct task_struct *task;