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The calculation of the upper limit for queues does not depend solely on the number of online CPUs; for example, the isolcpus kernel command-line option must also be considered. To account for this, the block layer provides a helper function to retrieve the maximum number of queues. Use it to set an appropriate upper queue number limit. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Daniel Wagner <wagi@kernel.org> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> Link: https://lore.kernel.org/r/20250617-isolcpus-queue-counters-v1-4-13923686b54b@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>