Lines Matching defs:pfn
279 #define should_use_kmap(pfn) 0
281 #define should_use_kmap(pfn) page_is_ram(pfn)
286 unsigned long pfn;
288 pfn = pg_off >> PAGE_SHIFT;
289 if (should_use_kmap(pfn)) {
292 return (void __iomem __force *)kmap(pfn_to_page(pfn));
299 unsigned long pfn;
301 pfn = pg_off >> PAGE_SHIFT;
302 if (should_use_kmap(pfn))
303 kunmap(pfn_to_page(pfn));