Worked on the sched-ext/scx repository, delivering a focused refactor of BPF land initialization to streamline CPU mask management. The approach involved replacing manual mask creation with the calloc_cpumask helper, which simplified handling of primary, L2, and L3 CPU masks across task contexts. This change reduced repetitive code and improved the maintainability and readability of the BPF initialization logic. By leveraging C and system programming skills within the context of kernel development, the work laid a foundation for safer CPU mask handling and easier future audits. No bugs were reported during this period, reflecting careful and targeted engineering efforts.