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Fri, 19 Jun 2026 21:59:26 +0000 (GMT) Received: from Linuxdev (unknown [9.43.77.5]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 19 Jun 2026 21:59:26 +0000 (GMT) From: Madhavan Srinivasan To: linuxppc-dev@lists.ozlabs.org, Aboorva Devarajan Cc: Athira Rajeev , Christophe Leroy , linux-kernel@vger.kernel.org, Sourabh Jain , Ritesh Harjani , Shrikanth Hegde Subject: Re: [PATCH v3 0/3] powerpc: fix preempt_count imbalances in perf and kexec paths Date: Sat, 20 Jun 2026 03:29:08 +0530 Message-ID: <178190618809.653308.7398309926910414335.b4-ty@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260605082912.305100-1-aboorvad@linux.ibm.com> References: <20260605082912.305100-1-aboorvad@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Info: AW1haW4tMjYwNjE5MDIxMCBTYWx0ZWRfX+nO9FMZIVyVj ji7tdP7mfFZI2HgEX0VSpq+g1vpcnJOTUxO+FnknGuOAfQ5zLXaVncCb/YmL+7Q8gWF9Q3nicd8 fCZ741Ahwn3cPQYRO0V0LeK8HqyV7+I= X-Proofpoint-ORIG-GUID: RW_XK1qNgOxXlhzzUGRG2X2qGWbLrSFU X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjE5MDIxMCBTYWx0ZWRfX4PCyX69o8JxV LBRMT46QdXS9feq+9W1UNsRrJZsu4eo6IXiY0FIiWyupf9yPa3mwJ/d0oVPdF+TKptqGQcWqHuM D3YgWCPOB1ZgxPtAu9UmgvwWSj30VPlbppxhHKC3bv8i5i5MWCGgL7cJve90/vz+AopkilMqbXI qIrYQClHdEZRXQdgoWgh4rMbNF5j4j6VT7W+LXeV/YT8YOw/hEgk3fhxy7xbxQqomeq/5Sv+w/c 2s7lk4Y/L+eMgJmTsKSG73i3mN2rt5tgTatOGnQHalYfpFNjlkhtv3QB9lz7XttGpxcbdqVbbwv 3AHbnusF9IqbhjVKilKh60II0YYDGe1tcKpex8XlmgfjP/Dl8K0Qzkg+Sn2FBThnSBs0LaYSjIJ /+7wJfICfSpqF5G/m4kLqt+JF0jqZSBMe/0luJ8Fd4QBl1zMrfVFBRuesdG70fPBZ8ZLDD2XCuS y/+SfsfADMR8s+42vag== X-Proofpoint-GUID: eDtnBeLAUuaK7w_cxlaZkX52WHwmxwDJ X-Authority-Analysis: v=2.4 cv=L9gtheT8 c=1 sm=1 tr=0 ts=6a35bbc5 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=ZoOJJehYrJv9vKhu22gA:9 a=QEXdDO2ut3YA:10 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=2026-06-19_05,2026-06-18_03,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 impostorscore=0 malwarescore=0 clxscore=1015 adultscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606190210 On Fri, 05 Jun 2026 13:59:09 +0530, Aboorva Devarajan wrote: > 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. > > [...] Applied to powerpc/next. [1/3] powerpc/perf: fix preempt count underflow in fsl_emb_pmu_del https://git.kernel.org/powerpc/c/81e3a86030462824a67d697739cf3f387f4ba350 [2/3] powerpc/powernv: fix preempt count leak in pnv_kexec_wait_secondaries_down https://git.kernel.org/powerpc/c/0ecd26e93e698c8327521910fc6296f5b84a4b92 [3/3] powerpc/kexec: fix double get_cpu() imbalance in kexec_prepare_cpus https://git.kernel.org/powerpc/c/5c86f1c1f972761a04bf22f4c0618d1aa714185b cheers