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Sat, 2 May 2026 07:39:29 +0000 (GMT) From: Athira Rajeev To: acme@kernel.org, jolsa@kernel.org, adrian.hunter@intel.com, mpetlan@redhat.com, tmricht@linux.ibm.com, maddy@linux.ibm.com, irogers@google.com, namhyung@kernel.org Cc: linux-perf-users@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, atrajeev@linux.ibm.com, hbathini@linux.vnet.ibm.com, Tejas.Manhas1@ibm.com, Tanushree.Shah@ibm.com, shivani@linux.ibm.com Subject: [PATCH V3 1/2] powerpc tools perf: Initialize error code in auxtrace_record_init function Date: Sat, 2 May 2026 13:09:23 +0530 Message-Id: <20260502073924.99965-1-atrajeev@linux.ibm.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: lw-988zIJr5QU8gl66kiA5tnWNY3MCsF X-Proofpoint-GUID: xDSIgA-yTN_XAIv3DgRf4hiiHfe4eeVb X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTAyMDA3MyBTYWx0ZWRfX/AcJJDisEpPs NXzKo6qG33ApHSPy4TbfjDCDuZsEoYpPvRkXV2EF0KcLZs/zFKcQSjiU3O1y2mpAMa/QHFnAeSp Vskd+vck1L1gj/VdCZcmRxAVbVC6aGD/lRVsZgh9hPDfWvKWxIwNSXNsFRjpIRA5RW99O5B0BDo 01BoiRVuJVTR0VhaU8tuySeIEjO2l2TAatbirI26Gy+yTNFk0xAgFE+TbpejiW3kCA/nrBn5M3o se8wKvwvIwUsp6BPox4lwryhbYxNHMp7QnKnm/ywcskAkn0DoHDlVCsZ6ph+CO9jtadq0DpRUl1 cD7F/6dn4tR6zfso20dIn8Yuqmbim5W6b4gy/7PQd26EobN7CaDjpmxsR/3ocXoPydCA8koREmu yg2RrRZwxr4jOsnZPc5jUSMRmpwnPHrnbIJtbgHzUhFRR/BTDP9IpvL4PRTMcv49Vl49i3A+aRW pWwDDGB2Y93DTioJmwQ== X-Authority-Analysis: v=2.4 cv=UbFhjqSN c=1 sm=1 tr=0 ts=69f5aa3d cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=UYfmDeaf6v5XVjAx5qsA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-02_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 lowpriorityscore=0 malwarescore=0 suspectscore=0 adultscore=0 priorityscore=1501 bulkscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605020073 perf trace record fails some cases in powerpc # ./perf test "perf trace record and replay" 128: perf trace record and replay : FAILED! # ./perf trace record sleep 1 # echo $? 32 This is happening because of non-zero err value from auxtrace_record__init() function. static int record__auxtrace_init(struct record *rec) { int err; if ((rec->opts.auxtrace_snapshot_opts || rec->opts.auxtrace_sample_opts) && record__threads_enabled(rec)) { pr_err("AUX area tracing options are not available in parallel streaming mode.\n"); return -EINVAL; } if (!rec->itr) { rec->itr = auxtrace_record__init(rec->evlist, &err); if (err) return err; } Here "int err" is not initialised. The code expects "err" to be set from auxtrace_record__init() function. Update auxtrace_record__init() in arch/powerpc/util/auxtrace.c to clear err value in the beginning. - Clear err value in beginning of function. Any fail later will set appropriate return code to err. - Even if we haven't found any event for auxtrace, perf record should continue for other events. NULL return will indicate that there is no auxtrace record initialized. - Not having "err" set here will affect monitoring of other events also because perf record will fail seeing random value in err. Set err to -EINVAL before invoking auxtrace_record__init() in builtin-record.c With the fix, # ./perf trace record sleep 1 [ perf record: Woken up 2 times to write data ] [ perf record: Captured and wrote 0.033 MB perf.data (228 samples) ] Fixes: 1dbfaf94cf66 ("perf powerpc: Add basic CONFIG_AUXTRACE support for VPA pmu on powerpc") Signed-off-by: Athira Rajeev --- Changelog: v1 -> v2 Addressed review comment from Adrian: - Set err to -EINVAL before invoking auxtrace_record__init() in builtin-record.c - Added kernel-doc to auxtrace_record__init() in tools/perf/util/auxtrace.c Addressed review comment from Namhyung: - Added fixes tag tools/perf/arch/powerpc/util/auxtrace.c | 6 ++++++ tools/perf/builtin-record.c | 1 + 2 files changed, 7 insertions(+) diff --git a/tools/perf/arch/powerpc/util/auxtrace.c b/tools/perf/arch/powerpc/util/auxtrace.c index e39deff6c857..4600a1661b4f 100644 --- a/tools/perf/arch/powerpc/util/auxtrace.c +++ b/tools/perf/arch/powerpc/util/auxtrace.c @@ -71,6 +71,12 @@ struct auxtrace_record *auxtrace_record__init(struct evlist *evlist, struct evsel *pos; int found = 0; + /* + * Set err value to zero here. Any fail later + * will set appropriate return code to err. + */ + *err = 0; + evlist__for_each_entry(evlist, pos) { if (strstarts(pos->name, "vpa_dtl")) { found = 1; diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 4a5eba498c02..708825747af5 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -865,6 +865,7 @@ static int record__auxtrace_init(struct record *rec) } if (!rec->itr) { + err = -EINVAL; rec->itr = auxtrace_record__init(rec->evlist, &err); if (err) return err; -- 2.47.3