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Fri, 05 Jun 2026 08:29:25 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (smtpav05.fra02v.mail.ibm.com [10.20.54.104]) by smtprelay02.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 6558TLU150266444 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 5 Jun 2026 08:29:21 GMT Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3DAB220043; Fri, 5 Jun 2026 08:29:21 +0000 (GMT) Received: from smtpav05.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E7E8E20040; Fri, 5 Jun 2026 08:29:18 +0000 (GMT) Received: from aboo.bl1-in.ibm.com (unknown [9.123.14.187]) by smtpav05.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 5 Jun 2026 08:29:18 +0000 (GMT) From: Aboorva Devarajan To: Madhavan Srinivasan , linuxppc-dev@lists.ozlabs.org Cc: Athira Rajeev , Aboorva Devarajan , Christophe Leroy , linux-kernel@vger.kernel.org, Sourabh Jain , Ritesh Harjani , Shrikanth Hegde Subject: [PATCH v3 0/3] powerpc: fix preempt_count imbalances in perf and kexec paths Date: Fri, 5 Jun 2026 13:59:09 +0530 Message-ID: <20260605082912.305100-1-aboorvad@linux.ibm.com> X-Mailer: git-send-email 2.54.0 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=Zt3d7d7G c=1 sm=1 tr=0 ts=6a2288e6 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=EHRFYB8xNeBlr5IdY6MA:9 X-Proofpoint-GUID: WUrHnIsSVauSbKzqaYQN4KLZg6-SJ3KJ X-Proofpoint-ORIG-GUID: CO7LofAGwJn7OViUwSMIlvPFupV8ibLs X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjA1MDA3NyBTYWx0ZWRfXzArCpYSzNDLW hkzp/56IbMJEWvEOvL/LPrr2p5Qfyry/Q5Flo+bECTC0kq8hhBdElrI/tEUXYXX+jtzKuPHwOmt rdhH9L7BM6KLV7OwGonqfTqnTCYk/aFkZeqV89JAhRWFWrHH+8XkbHidClteMoYOXYU2P7aTKKF Y3Fb4jYsZlFK9PwWNVSRLEV9xPGZQyY8Ubrg1zst1gEJx98EK+Ph1Z/pwYFxq9aTxzegfrWLGFj P4aSqzY6baebLOGrR2YnXMRW3AQjYW3LEw/bM161KWhHxHKgeL3Fkit5D1X94ryImKcS9EuA9K9 f75qBBlzBmnCwDE+qauzyaQgHFf0INSlpI/90Yc588Eg+5Vrtvm5NOAJG/DxLR/I+12ELks3Wgl 5u40HZiv+IEmsCLHHDktInOlT/2Dix9EYoSj/uV72nYKlB9/DUucB9uYqAbR0nFRIYI54BPq8sL izAOxoPZQpH5965zKaw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-05_01,2026-05-28_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 clxscore=1015 phishscore=0 spamscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605210000 definitions=main-2606050077 Hi all, This patch series fixes some minor preempt_count bookkeeping issues in arch/powerpc/ found during a preemption leak audit prompted by the lazy/full preemption model changes. These are get_cpu/put_cpu and get_cpu_var/put_cpu_var pairing errors that leave preempt_count incorrectly elevated or underflowed. v2 -> v3: - Patches 2 and 3: use raw_smp_processor_id() instead of smp_processor_id(). Both paths run with interrupts disabled, so the plain accessor is sufficient. v2: https://lore.kernel.org/all/20260603062743.1152253-1-aboorvad@linux.ibm.com/ v1: https://lore.kernel.org/all/20260518050855.1147242-1-aboorvad@linux.ibm.com/ Testing: - Patches 2 and 3: kexec boot-tested on PowerNV (powernv_defconfig) and pseries (pseries_defconfig). - Patch 1: compile-tested only (ppc64e_defconfig + CONFIG_FSL_EMB_PERFMON); no e500/fsl_emb hardware to runtime-test. Please let me know your comments. Thanks, Aboorva Aboorva Devarajan (3): powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del powerpc/powernv: fix preempt count leak in pnv_kexec_wait_secondaries_down powerpc/kexec: fix double get_cpu() imbalance in kexec_prepare_cpus arch/powerpc/kexec/core_64.c | 4 +--- arch/powerpc/perf/core-fsl-emb.c | 3 ++- arch/powerpc/platforms/powernv/setup.c | 3 ++- 3 files changed, 5 insertions(+), 5 deletions(-) base-commit: 03da3bc22934393e1dcc63ed3c50457b6d7e345e -- 2.54.0