/* 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> void free_pgtables(struct mmu_gather *tlb, struct vm_area_struct *start_vma, unsigned long floor, unsigned long ceiling); 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 unsigned long highest_memmap_pfn; /* * in mm/vmscan.c: */ extern int isolate_lru_page(struct page *page); extern void putback_lru_page(struct page *page); /* * in mm/page_alloc.c */ extern void __free_pages_bootmem(struct page *page, unsigned int order); extern void prep_compound_page(struct page *page, unsigned long 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); } #ifdef CONFIG_HAVE_MLOCK extern long mlock_vma_pages_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); extern void munlock_vma_pages_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); static inline void munlock_vma_pages_all(struct vm_area_struct *vma) { munlock_vma_pages_range(vma, vma->vm_start, vma->vm_end); } #endif /* * unevictable_migrate_page() called only from migrate_page_copy() to * migrate unevictable flag to new page. * Note that the old page has been isolated from the LRU lists at this * point so we don't need to worry about LRU statistics. */ static inline void unevictable_migrate_page(struct page *new, struct page *old) { if (TestClearPageUnevictable(old)) SetPageUnevictable(new); } #ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT /* * Called only in fault path via page_evictable() for a new page * to determine if it's being mapped into a LOCKED vma. * If so, mark page as mlocked. */ static inline int is_mlocked_vma(struct vm_area_struct *vma, struct page *page) { VM_BUG_ON(PageLRU(page)); if (likely((vma->vm_flags & (VM_LOCKED | VM_SPECIAL)) != VM_LOCKED)) return 0; if (!TestSetPageMlocked(page)) { inc_zone_page_state(page, NR_MLOCK); count_vm_event(UNEVICTABLE_PGMLOCKED); } return 1; } /* * must be called with vma's mmap_sem held for read, and page locked. */ extern void mlock_vma_page(struct page *page); /* * Clear the page's PageMlocked(). This can be useful in a situation where * we want to unconditionally remove a page from the pagecache -- e.g., * on truncation or freeing. * * It is legal to call this function for any page, mlocked or not. * If called for a page that is still mapped by mlocked vmas, all we do * is revert to lazy LRU behaviour -- semantics are not broken. */ extern void __clear_page_mlock(struct page *page); static inline void clear_page_mlock(struct page *page) { if (unlikely(TestClearPageMlocked(page))) __clear_page_mlock(page); } /* * mlock_migrate_page - called only from migrate_page_copy() to * migrate the Mlocked page flag; update statistics. */ static inline void mlock_migrate_page(struct page *newpage, struct page *page) { if (TestClearPageMlocked(page)) { unsigned long flags; local_irq_save(flags); __dec_zone_page_state(page, NR_MLOCK); SetPageMlocked(newpage); __inc_zone_page_state(newpage, NR_MLOCK); local_irq_restore(flags); } } #else /* CONFIG_HAVE_MLOCKED_PAGE_BIT */ static inline int is_mlocked_vma(struct vm_area_struct *v, struct page *p) { return 0; } static inline void clear_page_mlock(struct page *page) { } static inline void mlock_vma_page(struct page *page) { } static inline void mlock_migrate_page(struct page *new, struct page *old) { } #endif /* CONFIG_HAVE_MLOCKED_PAGE_BIT */ /* * Return the mem_map entry representing the 'offset' subpage within * the maximally aligned gigantic page 'base'. Handle any discontiguity * in the mem_map at MAX_ORDER_NR_PAGES boundaries. */ static inline struct page *mem_map_offset(struct page *base, int offset) { if (unlikely(offset >= MAX_ORDER_NR_PAGES)) return pfn_to_page(page_to_pfn(base) + offset); return base + offset; } /* * Iterator over all subpages withing the maximally aligned gigantic * page 'base'. Handle any discontiguity in the mem_map. */ static inline struct page *mem_map_next(struct page *iter, struct page *base, int offset) { if (unlikely((offset & (MAX_ORDER_NR_PAGES - 1)) == 0)) { unsigned long pfn = page_to_pfn(base) + offset; if (!pfn_valid(pfn)) return NULL; return pfn_to_page(pfn); } return iter + 1; } /* * 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 /* Memory initialisation debug and verification */ enum mminit_level { MMINIT_WARNING, MMINIT_VERIFY, MMINIT_TRACE }; #ifdef CONFIG_DEBUG_MEMORY_INIT extern int mminit_loglevel; #define mminit_dprintk(level, prefix, fmt, arg...) \ do { \ if (level < mminit_loglevel) { \ printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG); \ printk(KERN_CONT "mminit::" prefix " " fmt, ##arg); \ } \ } while (0) extern void mminit_verify_pageflags_layout(void); extern void mminit_verify_page_links(struct page *page, enum zone_type zone, unsigned long nid, unsigned long pfn); extern void mminit_verify_zonelist(void); #else static inline void mminit_dprintk(enum mminit_level level, const char *prefix, const char *fmt, ...) { } static inline void mminit_verify_pageflags_layout(void) { } static inline void mminit_verify_page_links(struct page *page, enum zone_type zone, unsigned long nid, unsigned long pfn) { } static inline void mminit_verify_zonelist(void) { } #endif /* CONFIG_DEBUG_MEMORY_INIT */ /* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */ #if defined(CONFIG_SPARSEMEM) extern void mminit_validate_memmodel_limits(unsigned long *start_pfn, unsigned long *end_pfn); #else static inline void mminit_validate_memmodel_limits(unsigned long *start_pfn, unsigned long *end_pfn) { } #endif /* CONFIG_SPARSEMEM */ int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int len, unsigned int foll_flags, struct page **pages, struct vm_area_struct **vmas); #define ZONE_RECLAIM_NOSCAN -2 #define ZONE_RECLAIM_FULL -1 #define ZONE_RECLAIM_SOME 0 #define ZONE_RECLAIM_SUCCESS 1 #endif