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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: awlkwsLNmSCu2sRk0nPTogUE+A0Fsb+jvLqmnbfEritk1tVRb22GS4P8hSPBgrsZl0f2lkjnXuKj4nctT4dw7A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA4PR10MB8565 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-02_01,2025-12-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 phishscore=0 mlxlogscore=999 mlxscore=0 spamscore=0 malwarescore=0 bulkscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2512120000 definitions=main-2601020093 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTAyMDA5MyBTYWx0ZWRfX4IOE5M5QsRR3 BjT87LBk7/0lDklXUbIq6Xyl9hMMiPKvS57kyk11NS86DQr5lHBeFJiRajVy3cM8khubG2bmmls SSbhawqobjJ+6u5Dbd7buL3xJI+rtuv8MUBqvYS589hCq9HwRAGCNoULlgZiTCXSGignk7HVjSi qC2KGYYlzvnQwTG947eIu+QkNQ0HlX/YS9YE7GswXZyB3DaIOnLo3I+KAOekTaTu5zhguQYjXee 8DzQG+Mnel0YssMtu+18geOkHxQb9vdDT2UCGVQzLWjWvxMA3ANn7ttiohcN6o4sIJNRzAtvJY9 eaq00COo18ym1xgYFl1I/3KiQrglW8J3klNFSZHThbCviLkr9z1vcN6hIRVsBb+mRl2mm1qY8AT 897/Vi3ktBbDkK8gswVMBHK58Id90RxmsQhz+clYXhQwWKoFULYZHyz6akic7NMHeY5TOzZzKk1 upvwqOHMNYg5oY6xXIA== X-Authority-Analysis: v=2.4 cv=NMvYOk6g c=1 sm=1 tr=0 ts=69579f01 b=1 cx=c_pps a=WeWmnZmh0fydH62SvGsd2A==:117 a=WeWmnZmh0fydH62SvGsd2A==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=5KLPUuaC_9wA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=2UBqqSSNp84Is-KnQXoA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: RgqnscTXNUISxk-_u42SOv95qU_OXlZa X-Proofpoint-ORIG-GUID: RgqnscTXNUISxk-_u42SOv95qU_OXlZa On 31/12/2025 01:19, vulab@iscas.ac.cn wrote: > Hi John, > > Thank you for the feedback. > > Regarding the suggestion to audit all cpumask_of_node() implementations: > > I noticed that a very similar issue was recently fixed in the > megaraid_sas driver (commit 752eb816b55a, "scsi: megaraid_sas: Fix > invalid node index"), where an UBSAN array-index-out-of-bounds warning > was addressed by handling NUMA_NO_NODE locally in the driver. > > Following that approach, it seems reasonable for mpt3sas to handle > this case locally as well, while leaving any broader unification of > cpumask_of_node() semantics across architectures as a separate > discussion, since changes in the x86 topology headers may have wider > impact. > > Regarding the fallback behavior: > > The existing megaraid_sas fix falls back to node 0, but as you pointed > out, some implementations (e.g. drivers/base/arch_numa.c) treat > NUMA_NO_NODE as indicating no specific NUMA locality and return > cpu_all_mask. Forcing node 0 in this case may unnecessarily constrain > interrupt affinity on NUMA systems. > > For a v2, I propose to: > > > 1. > Fix the issue locally in the mpt3sas driver (similar to > > megaraid_sas); and > > > 1. > Use cpu_online_mask as the fallback when dev_to_node() returns > > NUMA_NO_NODE, to better match the intended semantics, while still > preventing out-of-bounds access. > > Please let me know if this sounds acceptable. I am not the driver maintainer, so it is not my choice. But I will try to remedy this in the per-arch code if you don't want to.