static inline void cache_op()

in kernel/dma.c [13:47]

• 31 lines of code
• 5 McCabe index (conditional complexity)

static inline void cache_op(phys_addr_t paddr, size_t size,
		void (*fn)(unsigned long start, unsigned long end))
{
	struct page *page = pfn_to_page(paddr >> PAGE_SHIFT);
	unsigned offset = paddr & ~PAGE_MASK;
	size_t left = size;
	unsigned long start;

	do {
		size_t len = left;

		if (PageHighMem(page)) {
			void *addr;

			if (offset + len > PAGE_SIZE) {
				if (offset >= PAGE_SIZE) {
					page += offset >> PAGE_SHIFT;
					offset &= ~PAGE_MASK;
				}
				len = PAGE_SIZE - offset;
			}

			addr = kmap_atomic(page);
			start = (unsigned long)(addr + offset);
			fn(start, start + len);
			kunmap_atomic(addr);
		} else {
			start = (unsigned long)phys_to_virt(paddr);
			fn(start, start + size);
		}
		offset = 0;
		page++;
		left -= len;
	} while (left);
}