/* internal.h: mm/ internal definitions * * 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. */ #ifndef __MM_INTERNAL_H #define __MM_INTERNAL_H #include <linux/mm.h> static inline void set_page_count(struct page *page, int v) { atomic_set(&page->_count, v); } /* * Turn a non-refcounted page (->_count == 0) into refcounted with * a count of one. */ static inline void set_page_refcounted(struct page *page) { VM_BUG_ON(PageTail(page)); VM_BUG_ON(atomic_read(&page->_count)); set_page_count(page, 1); } static inline void __put_page(struct page *page) { atomic_dec(&page->_count); } extern void __free_pages_bootmem(struct page *page, unsigned int order); /* * function for dealing with page's order in buddy system. * zone->lock is already acquired when we use these. * So, we don't need atomic page->flags operations here. */ static inline unsigned long page_order(struct page *page) { VM_BUG_ON(!PageBuddy(page)); return page_private(page); } /* * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, * so all functions starting at paging_init should be marked __init * in those cases. SPARSEMEM, however, allows for memory hotplug, * and alloc_bootmem_node is not used. */ #ifdef CONFIG_SPARSEMEM #define __paginginit __meminit #else #define __paginginit __init #endif #endif