static inline void cache_op()

in mm/dma-mapping.c [15:46]

• 26 lines of code
• 4 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    = phys_to_page(paddr);
	void *start          = __va(page_to_phys(page));
	unsigned long offset = offset_in_page(paddr);
	size_t left          = size;

	do {
		size_t len = left;

		if (offset + len > PAGE_SIZE)
			len = PAGE_SIZE - offset;

		if (PageHighMem(page)) {
			start = kmap_atomic(page);

			fn((unsigned long)start + offset,
					(unsigned long)start + offset + len);

			kunmap_atomic(start);
		} else {
			fn((unsigned long)start + offset,
					(unsigned long)start + offset + len);
		}
		offset = 0;

		page++;
		start += PAGE_SIZE;
		left -= len;
	} while (left);
}