Hello, The patch 1-2 are to cleanup unused variable and return type. The patch 3 is to fix the param usage description in kernel doc. The patch 4 is to panic on purpose when nslabs is too small. Dongli Zhang: [PATCH v1 1/4] swiotlb: remove unused swiotlb_force [PATCH v1 2/4] swiotlb: remove useless return [PATCH v1 3/4] x86/swiotlb: fix param usage in boot-options.rst [PATCH v1 4/4] swiotlb: panic if nslabs is too small Thank you very much! Dongli Zhang