/* highmem.c: arch-specific highmem stuff * * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/highmem.h> void *kmap(struct page *page) { might_sleep(); if (!PageHighMem(page)) return page_address(page); return kmap_high(page); } void kunmap(struct page *page) { if (in_interrupt()) BUG(); if (!PageHighMem(page)) return; kunmap_high(page); } struct page *kmap_atomic_to_page(void *ptr) { return virt_to_page(ptr); }