tracing/events: fix output format of user stack

According to "events/ftrace/user_stack/format", fix the output of
user stack.

before fix:

  sh-1073  [000]    31.137561:  <b7f274fe> <-  <0804e33c> <-  <080835c1>

after fix:

  sh-1072  [000]    37.039329:
 =>  <b7f8a4fe>
 =>  <0804e33c>
 =>  <080835c1>

Signed-off-by: walimis <walimisdev@gmail.com>
LKML-Reference: <1244016090-7814-3-git-send-email-walimisdev@gmail.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 64596a571609a123f596569ad8822d0ff6f11b1d..8dadbbbd2d5c36be0399e69a417b069b5f05d965 100644 (file)
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -389,17 +389,20 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
 
                if (ip == ULONG_MAX || !ret)
                        break;
-               if (i && ret)
-                       ret = trace_seq_puts(s, " <- ");
+               if (ret)
+                       ret = trace_seq_puts(s, " => ");
                if (!ip) {
                        if (ret)
                                ret = trace_seq_puts(s, "??");
+                       if (ret)
+                               ret = trace_seq_puts(s, "\n");
                        continue;
                }
                if (!ret)
                        break;
                if (ret)
                        ret = seq_print_user_ip(s, mm, ip, sym_flags);
+               ret = trace_seq_puts(s, "\n");
        }
 
        if (mm)
@@ -1012,10 +1015,10 @@ static enum print_line_t trace_user_stack_print(struct trace_iterator *iter,
 
        trace_assign_type(field, iter->ent);
 
-       if (!seq_print_userip_objs(field, s, flags))
+       if (!trace_seq_putc(s, '\n'))
                goto partial;
 
-       if (!trace_seq_putc(s, '\n'))
+       if (!seq_print_userip_objs(field, s, flags))
                goto partial;
 
        return TRACE_TYPE_HANDLED;