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

From: Adrian Hunter
Date: Thu Nov 22 2018 - 06:31:15 EST


Fix following warnings:

event-parse.c: In function âtep_find_event_by_nameâ:
event-parse.c:3521:21: warning: âeventâ 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 âtep_data_lat_fmtâ:
event-parse.c:5200:4: warning: âmigrate_disableâ may be used uninitialized in this function [-Wmaybe-uninitialized]
trace_seq_printf(s, "%d", migrate_disable);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event-parse.c:5207:4: warning: âlock_depthâ 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 âtep_event_infoâ:
event-parse.c:5047:7: warning: âlen_argâ may be used uninitialized in this function [-Wmaybe-uninitialized]
trace_seq_printf(s, format, len_arg, (char)val);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event-parse.c:4884:6: note: âlen_argâ was declared here
int len_arg;
^~~~~~~
event-parse.c:4338:11: warning: âvsizeâ may be used uninitialized in this function [-Wmaybe-uninitialized]
val = tep_read_number(pevent, bptr, vsize);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
event-parse.c:4224:6: note: âvsizeâ was declared here
int vsize;
^~~~~

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

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
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