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Date: Tue, 9 May 2023 08:31:23 +1000 Message-Id: <20230508223124.1438167-2-imran.f.khan@oracle.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230508223124.1438167-1-imran.f.khan@oracle.com> References: <20230508223124.1438167-1-imran.f.khan@oracle.com> MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-08_16,2023-05-05_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 malwarescore=0 adultscore=0 spamscore=0 mlxscore=0 phishscore=0 bulkscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2304280000 definitions=main-2305080149 X-Proofpoint-GUID: _fkGR7T4gLbh6PYqry66MmP2USW6qBbc X-Proofpoint-ORIG-GUID: _fkGR7T4gLbh6PYqry66MmP2USW6qBbc X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1765372411168015107?= X-GMAIL-MSGID: =?utf-8?q?1765372411168015107?= If a waiter is waiting for CSD lock, its call stack will not change between first and subsequent hang detection for the same CSD lock. So dump_stack for the waiter only for first time detection. This avoids excessive logging on large scale systems(with hundreds of CPUs) where repetitive dump_stack from hundreds of CPUs can flood the console. Signed-off-by: Imran Khan Reviewed-by: Paul E. McKenney --- kernel/smp.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/smp.c b/kernel/smp.c index ab3e5dad6cfe9..b7ccba677a0a0 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -248,7 +248,8 @@ static bool csd_lock_wait_toolong(struct __call_single_data *csd, u64 ts0, u64 * arch_send_call_function_single_ipi(cpu); } } - dump_stack(); + if (firsttime) + dump_stack(); *ts1 = ts2; return false;