1 /* internal.h: mm/ internal definitions 2 * 3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. 4 * Written by David Howells (dhowells@redhat.com) 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License 8 * as published by the Free Software Foundation; either version 9 * 2 of the License, or (at your option) any later version. 10 */ 11 #ifndef __MM_INTERNAL_H 12 #define __MM_INTERNAL_H 13 14 #include <linux/mm.h> 15 16 static inline void set_page_count(struct page *page, int v) 17 { 18 atomic_set(&page->_count, v); 19 } 20 21 /* 22 * Turn a non-refcounted page (->_count == 0) into refcounted with 23 * a count of one. 24 */ 25 static inline void set_page_refcounted(struct page *page) 26 { 27 VM_BUG_ON(PageTail(page)); 28 VM_BUG_ON(atomic_read(&page->_count)); 29 set_page_count(page, 1); 30 } 31 32 static inline void __put_page(struct page *page) 33 { 34 atomic_dec(&page->_count); 35 } 36 37 extern void __free_pages_bootmem(struct page *page, unsigned int order); 38 39 /* 40 * function for dealing with page's order in buddy system. 41 * zone->lock is already acquired when we use these. 42 * So, we don't need atomic page->flags operations here. 43 */ 44 static inline unsigned long page_order(struct page *page) 45 { 46 VM_BUG_ON(!PageBuddy(page)); 47 return page_private(page); 48 } 49 50 /* 51 * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node, 52 * so all functions starting at paging_init should be marked __init 53 * in those cases. SPARSEMEM, however, allows for memory hotplug, 54 * and alloc_bootmem_node is not used. 55 */ 56 #ifdef CONFIG_SPARSEMEM 57 #define __paginginit __meminit 58 #else 59 #define __paginginit __init 60 #endif 61 62 #endif 63