perf build fails on 5.12.0rc2 on s390 with this error message:
util/synthetic-events.c: In function
‘__event__synthesize_thread.part.0.isra’:
util/synthetic-events.c:787:19: error: ‘kernel_thread’ may be
used uninitialized in this function [-Werror=maybe-uninitialized]
787 | if (_pid == pid && !kernel_thread) {
| ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
The build succeeds using command 'make DEBUG=y'.
The variable kernel_thread is set by this function sequence:
__event__synthesize_thread()
| defines bool kernel_thread; as local variable and calls
+--> perf_event__prepare_comm(..., &kernel_thread)
+--> perf_event__get_comm_ids(..., bool *kernel);
On return of this function variable kernel is always
set to true of false.
To prevent this compile error, assign variable kernel_thread
a value when it is defined.
Output after:
[root@m35lp76 perf]# make util/synthetic-events.o
....
CC util/synthetic-events.o
[root@m35lp76 perf]#
Signed-off-by: Thomas Richter <[email protected]>
---
tools/perf/util/synthetic-events.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/util/synthetic-events.c
b/tools/perf/util/synthetic-events.c
index b698046ec2db..5dd451695f33 100644
--- a/tools/perf/util/synthetic-events.c
+++ b/tools/perf/util/synthetic-events.c
@@ -758,7 +758,7 @@ static int __event__synthesize_thread(union perf_event
*comm_event,
for (i = 0; i < n; i++) {
char *end;
pid_t _pid;
- bool kernel_thread;
+ bool kernel_thread = false;
_pid = strtol(dirent[i]->d_name, &end, 10);
if (*end)
--
2.29.2
