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| author | Thomas Richter <tmricht@linux.ibm.com> | 2021-03-09 12:04:47 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-03-10 09:16:47 -0300 |
| commit | c3d59cfde9cc1fa699eb6bf0d3ce4156354e3a98 (patch) | |
| tree | 4f6fd760f28aedbab8b2cb4b45e3c34c2cadc446 /tools | |
| parent | b410ed2a8572d41c68bd9208555610e4b07d0703 (diff) | |
| download | linux-c3d59cfde9cc1fa699eb6bf0d3ce4156354e3a98.tar.bz2 | |
perf synthetic-events: Fix uninitialized 'kernel_thread' variable
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 or 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]#
Fixes: c1b907953b2cd9ff ("perf tools: Skip PERF_RECORD_MMAP event synthesis for kernel threads")
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Sumanth Korikkar <sumanthk@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Link: http://lore.kernel.org/lkml/20210309110447.834292-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/synthetic-events.c | 2 |
1 files changed, 1 insertions, 1 deletions
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) |