void flush_dcache_page()

in mm/cache.c [755:784]

• 19 lines of code
• 6 McCabe index (conditional complexity)

void flush_dcache_page(struct page *page)
{
	struct address_space *mapping;

	if (!cache_is_vipt_aliasing()) {
		clear_bit(PG_dc_clean, &page->flags);
		return;
	}

	/* don't handle anon pages here */
	mapping = page_mapping_file(page);
	if (!mapping)
		return;

	/*
	 * pagecache page, file not yet mapped to userspace
	 * Make a note that K-mapping is dirty
	 */
	if (!mapping_mapped(mapping)) {
		clear_bit(PG_dc_clean, &page->flags);
	} else if (page_mapcount(page)) {

		/* kernel reading from page with U-mapping */
		phys_addr_t paddr = (unsigned long)page_address(page);
		unsigned long vaddr = page->index << PAGE_SHIFT;

		if (addr_not_cache_congruent(paddr, vaddr))
			__flush_dcache_page(paddr, vaddr);
	}
}