[PATCH] tools lib traceevent: Fix compile warnings in tools/lib/traceevent/event-parse.c

[Adrian Hunter]

Fix following warnings:

event-parse.c: In function ‘tep_find_event_by_name’:
event-parse.c:3521:21: warning: ‘event’ may be used uninitialized in this 
function [-Wmaybe-uninitialized]
  pevent->last_event = event;
  ~~~~~~~~~~~~~~~~~~~^~~~~~~
  CC       ui/gtk/hists.o
  LINK     plugin_mac80211.so
  CC       nlattr.o
event-parse.c: In function ‘tep_data_lat_fmt’:
event-parse.c:5200:4: warning: ‘migrate_disable’ may be used uninitialized in 
this function [-Wmaybe-uninitialized]
    trace_seq_printf(s, "%d", migrate_disable);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event-parse.c:5207:4: warning: ‘lock_depth’ may be used uninitialized in this 
function [-Wmaybe-uninitialized]
    trace_seq_printf(s, "%d", lock_depth);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  LINK     plugin_sched_switch.so
  LINK     plugin_function.so
  LINK     plugin_xen.so
event-parse.c: In function ‘tep_event_info’:
event-parse.c:5047:7: warning: ‘len_arg’ may be used uninitialized in this 
function [-Wmaybe-uninitialized]
       trace_seq_printf(s, format, len_arg, (char)val);
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event-parse.c:4884:6: note: ‘len_arg’ was declared here
  int len_arg;
      ^~~~~~~
event-parse.c:4338:11: warning: ‘vsize’ may be used uninitialized in this 
function [-Wmaybe-uninitialized]
     val = tep_read_number(pevent, bptr, vsize);
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event-parse.c:4224:6: note: ‘vsize’ was declared here
  int vsize;
      ^~~~~

$ gcc --version
  gcc (Clear Linux OS for Intel Architecture) 8.2.1 20180502

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
 tools/lib/traceevent/event-parse.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/tools/lib/traceevent/event-parse.c 
b/tools/lib/traceevent/event-parse.c
index 3692f29fee46..fbd6d6813fab 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -3498,7 +3498,7 @@ struct tep_event_format *
 tep_find_event_by_name(struct tep_handle *pevent,
                       const char *sys, const char *name)
 {
-       struct tep_event_format *event;
+       struct tep_event_format *event = NULL;
        int i;
 
        if (pevent->last_event &&
@@ -4221,7 +4221,7 @@ static struct tep_print_arg *make_bprint_args(char *fmt, 
void *data, int size, s
        unsigned long long ip, val;
        char *ptr;
        void *bptr;
-       int vsize;
+       int vsize = 0;
 
        field = pevent->bprint_buf_field;
        ip_field = pevent->bprint_ip_field;
@@ -4881,7 +4881,7 @@ static void pretty_print(struct trace_seq *s, void *data, 
int size, struct tep_e
        char format[32];
        int show_func;
        int len_as_arg;
-       int len_arg;
+       int len_arg = 0;
        int len;
        int ls;
 
@@ -5146,8 +5146,8 @@ void tep_data_lat_fmt(struct tep_handle *pevent,
        static int migrate_disable_exists;
        unsigned int lat_flags;
        unsigned int pc;
-       int lock_depth;
-       int migrate_disable;
+       int lock_depth = 0;
+       int migrate_disable = 0;
        int hardirq;
        int softirq;
        void *data = record->data;
-- 
2.17.1