lib/group_cpus: Let group_cpu_evenly() return the number of initialized masks

2025-07-01T16:24:11+00:00

group_cpu_evenly() might have allocated less groups then requested: group_cpu_evenly() __group_cpus_evenly() alloc_nodes_groups() # allocated total groups may be less than numgrps when # active total CPU number is less then numgrps In this case, the caller will do an out of bound access because the caller assumes the masks returned has numgrps. Return the number of groups created so the caller can limit the access range accordingly. Acked-by: Thomas Gleixner Reviewed-by: Hannes Reinecke Reviewed-by: Ming Lei Signed-off-by: Daniel Wagner Reviewed-by: Chaitanya Kulkarni Reviewed-by: Christoph Hellwig Link: https://lore.kernel.org/r/20250617-isolcpus-queue-counters-v1-1-13923686b54b@kernel.org Signed-off-by: Jens Axboe

genirq/affinity: Move group_cpus_evenly() into lib/

2023-01-17T17:50:06+00:00

group_cpus_evenly() has become a generic function which can be used for other subsystems than the interrupt subsystem, so move it into lib/. Signed-off-by: Ming Lei Signed-off-by: Thomas Gleixner Reviewed-by: Christoph Hellwig Reviewed-by: Jens Axboe Link: https://lore.kernel.org/r/20221227022905.352674-6-ming.lei@redhat.com

kernel/linux.git/include/linux/group_cpus.h, branch v6.19.11

lib/group_cpus: Let group_cpu_evenly() return the number of initialized masks

genirq/affinity: Move group_cpus_evenly() into lib/