void flush_dcache_page()

in mm/cacheflush.c [173:198]

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

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

	/*
	 * The zero page is never written to, so never has any dirty
	 * cache lines, and therefore never needs to be flushed.
	 */
	if (page == ZERO_PAGE(0))
		return;

	mapping = page_mapping_file(page);

	/* Flush this page if there are aliases. */
	if (mapping && !mapping_mapped(mapping)) {
		clear_bit(PG_dcache_clean, &page->flags);
	} else {
		__flush_dcache_page(mapping, page);
		if (mapping) {
			unsigned long start = (unsigned long)page_address(page);
			flush_aliases(mapping,  page);
			flush_icache_range(start, start + PAGE_SIZE);
		}
		set_bit(PG_dcache_clean, &page->flags);
	}
}