[PATCH 50/66] perf script python: Silence -Werror=maybe-uninitialized on gcc 5.3.0

From: Arnaldo Carvalho de Melo
Date: Tue Jul 12 2016 - 18:42:42 EST

From: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

Sounds like a compiler bug, but to silence it, initialize those
variables to NULL.

Noticed on:

Target: x86_64-alpine-linux-musl
Configured with: /home/buildozer/aports/main/gcc/src/gcc-5.3.0/configure
--prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
--build=x86_64-alpine-linux-musl --host=x86_64-alpine-linux-musl
--target=x86_64-alpine-linux-musl --with-pkgversion='Alpine 5.3.0'
--enable-checking=release --disable-fixed-point --disable-libstdcxx-pch
--disable-multilib --disable-nls --disable-werror --disable-symvers
--enable-__cxa_atexit --enable-esp --enable-cloog-backend
--enable-languages=c,c++,objc,java,fortran,ada --disable-libssp
--disable-libmudflap --disable-libsanitizer --enable-shared
--enable-threads --enable-tls --with-system-zlib
Thread model: posix
gcc version 5.3.0 (Alpine 5.3.0)

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-zyvsjvbl45o7hzcuz78wu2xi@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
tools/perf/util/scripting-engines/trace-event-python.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index ff134700bf30..6ac6b7a33f42 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -273,7 +273,7 @@ static PyObject *get_field_numeric_entry(struct event_format *event,
struct format_field *field, void *data)
bool is_array = field->flags & FIELD_IS_ARRAY;
- PyObject *obj, *list = NULL;
+ PyObject *obj = NULL, *list = NULL;
unsigned long long val;
unsigned int item_size, n_items, i;

@@ -392,7 +392,7 @@ static void python_process_tracepoint(struct perf_sample *sample,
struct addr_location *al)
struct event_format *event = evsel->tp_format;
- PyObject *handler, *context, *t, *obj, *callchain;
+ PyObject *handler, *context, *t, *obj = NULL, *callchain;
PyObject *dict = NULL;
static char handler_name[256];
struct format_field *field;