bitmap_base 1204 arch/arm/mm/dma-mapping.c dma_addr_t bitmap_base; bitmap_base 1213 arch/arm/mm/dma-mapping.c bitmap_base = mapping->base + mapping_size * bitmap_index; bitmap_base 1215 arch/arm/mm/dma-mapping.c start = (addr - bitmap_base) >> PAGE_SHIFT; bitmap_base 1217 arch/arm/mm/dma-mapping.c if (addr + size > bitmap_base + mapping_size) {