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Mon, 24 Aug 2026 12:23:12 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 24 Aug 2026 12:23:12 +0000 (GMT) From: Thomas Richter To: linux-s390@vger.kernel.org Cc: Thomas Richter Subject: [PATCH 0/3 v2] Add CPU hotplug support for PAI PMU Date: Mon, 24 Aug 2026 14:23:04 +0200 Message-ID: <20260824122307.86133-1-tmricht@linux.ibm.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: ZrBzno4TUsUr7V7CJc5BxkprZOyqfnRF X-Proofpoint-ORIG-GUID: ZrBzno4TUsUr7V7CJc5BxkprZOyqfnRF X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODI0MDEwMSBTYWx0ZWRfXwZgS38OlMByA L/xAJBhT91guRohOda5eB4fxk5czhv00LJ78ii5E1WD5pek1vGF6002LrXCZPxHFluBGXb6HOhu WpvcJzEeDJnag48htJoCmOFXwrLrdbeaAAHqbtyiAGY2udVf54inG207W3nHQmXVSlPIr+bZtZP eBHASmWCxrSwZurae3+4ZLd3tDRyk4AtXNRpsSp8xiAJVjQbyzAlsA3SUTq27rXFXXAkbq4wxuv GyIas2PWRvUEkC9sXyvCZUMdhUnJ1082j/1Kx/1hEbk8rlU7wSBRkQmmG3oRfJetukyrcVMXqtl nYKiiRalz7jKTZJzGtSGfbIfrzu8PMTj7DesFoVUdz549xnBK+pDrjLw1TnRh7ZkgJgs4XxOMGq RweyMnckg/HXLyuSgPPCkRhHJ7UyWDj5kElyj8mndMhD0GPMB/u/NOo1k9nIjehRBRZ4ajASBCO uz8SXSUfv2N98NeG6VA== X-Authority-Analysis: v=2.4 cv=QsRuG1yd c=1 sm=1 tr=0 ts=6a8c37b6 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VnNF1IyMAAAA:8 a=lQW9TJnzQ4aT2Au-fZ0A:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwODI0MDEwMSBTYWx0ZWRfX0k0FV9GqKxmU NAY9bcR7nkJBJ6UwXSHWDmbGwgs4CU/fVvoBulTYGhjiLo0lPeGF1fKPd66maTregAuXLszqkDu ZgWTuR2/aNvityWhYWyL2PL+/wezWig= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-24_03,2026-08-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 adultscore=0 suspectscore=0 priorityscore=1501 impostorscore=0 spamscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608240101 V4: Add findings from Sumanth and updated patch 3/3. - Fix reference count for CPU hotplug remove while multiple per-task events are active. V3: Add findings from Sumanth and updated patch 3/3. - Refined Fixes: commit id and messages - Handle cpuhp_setup_state() failure V2: Add findings from Sumanth and updated patch 3/3. - handle possible NULL pointer dereference in pai_event_destroy_cpu() - handle possibe memory allocation failure in pai_online_cpu() - add Reviewed-by: Sumanth Korikkar to patch 1/3 and patch 2/3. Add support for CPU hotplug add and remove for PAI PMU. Patch 1: Change function argument list Patch 2: Move locking from CPU scope to event scope Patch 3: Add CPU hotplug handler Thomas Richter (3): s390/pai: Use PAI PMU index as parameter replacing event s390/pai: Move locking to event init and delete s390/pai: Support CPU hotplug for PMU PAI arch/s390/include/asm/pai.h | 1 - arch/s390/kernel/perf_pai.c | 178 +++++++++++++++++++++++++----------- 2 files changed, 124 insertions(+), 55 deletions(-) -- 2.55.0