diff options
Diffstat (limited to 'ANDROID_3.4.5/include/linux/mm.h')
| -rw-r--r-- | ANDROID_3.4.5/include/linux/mm.h | 1638 |
1 files changed, 0 insertions, 1638 deletions
diff --git a/ANDROID_3.4.5/include/linux/mm.h b/ANDROID_3.4.5/include/linux/mm.h deleted file mode 100644 index 3bf2f379..00000000 --- a/ANDROID_3.4.5/include/linux/mm.h +++ /dev/null @@ -1,1638 +0,0 @@ -#ifndef _LINUX_MM_H -#define _LINUX_MM_H - -#include <linux/errno.h> - -#ifdef __KERNEL__ - -#include <linux/gfp.h> -#include <linux/bug.h> -#include <linux/list.h> -#include <linux/mmzone.h> -#include <linux/rbtree.h> -#include <linux/prio_tree.h> -#include <linux/atomic.h> -#include <linux/debug_locks.h> -#include <linux/mm_types.h> -#include <linux/range.h> -#include <linux/pfn.h> -#include <linux/bit_spinlock.h> -#include <linux/shrinker.h> - -struct mempolicy; -struct anon_vma; -struct file_ra_state; -struct user_struct; -struct writeback_control; - -#ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ -extern unsigned long max_mapnr; -#endif - -extern unsigned long num_physpages; -extern unsigned long totalram_pages; -extern void * high_memory; -extern int page_cluster; - -#ifdef CONFIG_SYSCTL -extern int sysctl_legacy_va_layout; -#else -#define sysctl_legacy_va_layout 0 -#endif - -#include <asm/page.h> -#include <asm/pgtable.h> -#include <asm/processor.h> - -#define nth_page(page,n) pfn_to_page(page_to_pfn((page)) + (n)) - -/* to align the pointer to the (next) page boundary */ -#define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE) - -/* - * Linux kernel virtual memory manager primitives. - * The idea being to have a "virtual" mm in the same way - * we have a virtual fs - giving a cleaner interface to the - * mm details, and allowing different kinds of memory mappings - * (from shared memory to executable loading to arbitrary - * mmap() functions). - */ - -extern struct kmem_cache *vm_area_cachep; - -#ifndef CONFIG_MMU -extern struct rb_root nommu_region_tree; -extern struct rw_semaphore nommu_region_sem; - -extern unsigned int kobjsize(const void *objp); -#endif - -/* - * vm_flags in vm_area_struct, see mm_types.h. - */ -#define VM_READ 0x00000001 /* currently active flags */ -#define VM_WRITE 0x00000002 -#define VM_EXEC 0x00000004 -#define VM_SHARED 0x00000008 - -/* mprotect() hardcodes VM_MAYREAD >> 4 == VM_READ, and so for r/w/x bits. */ -#define VM_MAYREAD 0x00000010 /* limits for mprotect() etc */ -#define VM_MAYWRITE 0x00000020 -#define VM_MAYEXEC 0x00000040 -#define VM_MAYSHARE 0x00000080 - -#define VM_GROWSDOWN 0x00000100 /* general info on the segment */ -#if defined(CONFIG_STACK_GROWSUP) || defined(CONFIG_IA64) -#define VM_GROWSUP 0x00000200 -#else -#define VM_GROWSUP 0x00000000 -#define VM_NOHUGEPAGE 0x00000200 /* MADV_NOHUGEPAGE marked this vma */ -#endif -#define VM_PFNMAP 0x00000400 /* Page-ranges managed without "struct page", just pure PFN */ -#define VM_DENYWRITE 0x00000800 /* ETXTBSY on write attempts.. */ - -#define VM_EXECUTABLE 0x00001000 -#define VM_LOCKED 0x00002000 -#define VM_IO 0x00004000 /* Memory mapped I/O or similar */ - - /* Used by sys_madvise() */ -#define VM_SEQ_READ 0x00008000 /* App will access data sequentially */ -#define VM_RAND_READ 0x00010000 /* App will not benefit from clustered reads */ - -#define VM_DONTCOPY 0x00020000 /* Do not copy this vma on fork */ -#define VM_DONTEXPAND 0x00040000 /* Cannot expand with mremap() */ -#define VM_RESERVED 0x00080000 /* Count as reserved_vm like IO */ -#define VM_ACCOUNT 0x00100000 /* Is a VM accounted object */ -#define VM_NORESERVE 0x00200000 /* should the VM suppress accounting */ -#define VM_HUGETLB 0x00400000 /* Huge TLB Page VM */ -#define VM_NONLINEAR 0x00800000 /* Is non-linear (remap_file_pages) */ -#ifndef CONFIG_TRANSPARENT_HUGEPAGE -#define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */ -#else -#define VM_HUGEPAGE 0x01000000 /* MADV_HUGEPAGE marked this vma */ -#endif -#define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ -#define VM_NODUMP 0x04000000 /* Do not include in the core dump */ - -#define VM_CAN_NONLINEAR 0x08000000 /* Has ->fault & does nonlinear pages */ -#define VM_MIXEDMAP 0x10000000 /* Can contain "struct page" and pure PFN pages */ -#define VM_SAO 0x20000000 /* Strong Access Ordering (powerpc) */ -#define VM_PFN_AT_MMAP 0x40000000 /* PFNMAP vma that is fully mapped at mmap time */ -#define VM_MERGEABLE 0x80000000 /* KSM may merge identical pages */ - -/* Bits set in the VMA until the stack is in its final location */ -#define VM_STACK_INCOMPLETE_SETUP (VM_RAND_READ | VM_SEQ_READ) - -#ifndef VM_STACK_DEFAULT_FLAGS /* arch can override this */ -#define VM_STACK_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS -#endif - -#ifdef CONFIG_STACK_GROWSUP -#define VM_STACK_FLAGS (VM_GROWSUP | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) -#else -#define VM_STACK_FLAGS (VM_GROWSDOWN | VM_STACK_DEFAULT_FLAGS | VM_ACCOUNT) -#endif - -#define VM_READHINTMASK (VM_SEQ_READ | VM_RAND_READ) -#define VM_ClearReadHint(v) (v)->vm_flags &= ~VM_READHINTMASK -#define VM_NormalReadHint(v) (!((v)->vm_flags & VM_READHINTMASK)) -#define VM_SequentialReadHint(v) ((v)->vm_flags & VM_SEQ_READ) -#define VM_RandomReadHint(v) ((v)->vm_flags & VM_RAND_READ) - -/* - * Special vmas that are non-mergable, non-mlock()able. - * Note: mm/huge_memory.c VM_NO_THP depends on this definition. - */ -#define VM_SPECIAL (VM_IO | VM_DONTEXPAND | VM_RESERVED | VM_PFNMAP) - -/* - * mapping from the currently active vm_flags protection bits (the - * low four bits) to a page protection mask.. - */ -extern pgprot_t protection_map[16]; - -#define FAULT_FLAG_WRITE 0x01 /* Fault was a write access */ -#define FAULT_FLAG_NONLINEAR 0x02 /* Fault was via a nonlinear mapping */ -#define FAULT_FLAG_MKWRITE 0x04 /* Fault was mkwrite of existing pte */ -#define FAULT_FLAG_ALLOW_RETRY 0x08 /* Retry fault if blocking */ -#define FAULT_FLAG_RETRY_NOWAIT 0x10 /* Don't drop mmap_sem and wait when retrying */ -#define FAULT_FLAG_KILLABLE 0x20 /* The fault task is in SIGKILL killable region */ - -/* - * This interface is used by x86 PAT code to identify a pfn mapping that is - * linear over entire vma. This is to optimize PAT code that deals with - * marking the physical region with a particular prot. This is not for generic - * mm use. Note also that this check will not work if the pfn mapping is - * linear for a vma starting at physical address 0. In which case PAT code - * falls back to slow path of reserving physical range page by page. - */ -static inline int is_linear_pfn_mapping(struct vm_area_struct *vma) -{ - return !!(vma->vm_flags & VM_PFN_AT_MMAP); -} - -static inline int is_pfn_mapping(struct vm_area_struct *vma) -{ - return !!(vma->vm_flags & VM_PFNMAP); -} - -/* - * vm_fault is filled by the the pagefault handler and passed to the vma's - * ->fault function. The vma's ->fault is responsible for returning a bitmask - * of VM_FAULT_xxx flags that give details about how the fault was handled. - * - * pgoff should be used in favour of virtual_address, if possible. If pgoff - * is used, one may set VM_CAN_NONLINEAR in the vma->vm_flags to get nonlinear - * mapping support. - */ -struct vm_fault { - unsigned int flags; /* FAULT_FLAG_xxx flags */ - pgoff_t pgoff; /* Logical page offset based on vma */ - void __user *virtual_address; /* Faulting virtual address */ - - struct page *page; /* ->fault handlers should return a - * page here, unless VM_FAULT_NOPAGE - * is set (which is also implied by - * VM_FAULT_ERROR). - */ -}; - -/* - * These are the virtual MM functions - opening of an area, closing and - * unmapping it (needed to keep files on disk up-to-date etc), pointer - * to the functions called when a no-page or a wp-page exception occurs. - */ -struct vm_operations_struct { - void (*open)(struct vm_area_struct * area); - void (*close)(struct vm_area_struct * area); - int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); - - /* notification that a previously read-only page is about to become - * writable, if an error is returned it will cause a SIGBUS */ - int (*page_mkwrite)(struct vm_area_struct *vma, struct vm_fault *vmf); - - /* called by access_process_vm when get_user_pages() fails, typically - * for use by special VMAs that can switch between memory and hardware - */ - int (*access)(struct vm_area_struct *vma, unsigned long addr, - void *buf, int len, int write); -#ifdef CONFIG_NUMA - /* - * set_policy() op must add a reference to any non-NULL @new mempolicy - * to hold the policy upon return. Caller should pass NULL @new to - * remove a policy and fall back to surrounding context--i.e. do not - * install a MPOL_DEFAULT policy, nor the task or system default - * mempolicy. - */ - int (*set_policy)(struct vm_area_struct *vma, struct mempolicy *new); - - /* - * get_policy() op must add reference [mpol_get()] to any policy at - * (vma,addr) marked as MPOL_SHARED. The shared policy infrastructure - * in mm/mempolicy.c will do this automatically. - * get_policy() must NOT add a ref if the policy at (vma,addr) is not - * marked as MPOL_SHARED. vma policies are protected by the mmap_sem. - * If no [shared/vma] mempolicy exists at the addr, get_policy() op - * must return NULL--i.e., do not "fallback" to task or system default - * policy. - */ - struct mempolicy *(*get_policy)(struct vm_area_struct *vma, - unsigned long addr); - int (*migrate)(struct vm_area_struct *vma, const nodemask_t *from, - const nodemask_t *to, unsigned long flags); -#endif -}; - -struct mmu_gather; -struct inode; - -#define page_private(page) ((page)->private) -#define set_page_private(page, v) ((page)->private = (v)) - -/* - * FIXME: take this include out, include page-flags.h in - * files which need it (119 of them) - */ -#include <linux/page-flags.h> -#include <linux/huge_mm.h> - -/* - * Methods to modify the page usage count. - * - * What counts for a page usage: - * - cache mapping (page->mapping) - * - private data (page->private) - * - page mapped in a task's page tables, each mapping - * is counted separately - * - * Also, many kernel routines increase the page count before a critical - * routine so they can be sure the page doesn't go away from under them. - */ - -/* - * Drop a ref, return true if the refcount fell to zero (the page has no users) - */ -static inline int put_page_testzero(struct page *page) -{ - VM_BUG_ON(atomic_read(&page->_count) == 0); - return atomic_dec_and_test(&page->_count); -} - -/* - * Try to grab a ref unless the page has a refcount of zero, return false if - * that is the case. - */ -static inline int get_page_unless_zero(struct page *page) -{ - return atomic_inc_not_zero(&page->_count); -} - -extern int page_is_ram(unsigned long pfn); - -/* Support for virtually mapped pages */ -struct page *vmalloc_to_page(const void *addr); -unsigned long vmalloc_to_pfn(const void *addr); - -/* - * Determine if an address is within the vmalloc range - * - * On nommu, vmalloc/vfree wrap through kmalloc/kfree directly, so there - * is no special casing required. - */ -static inline int is_vmalloc_addr(const void *x) -{ -#ifdef CONFIG_MMU - unsigned long addr = (unsigned long)x; - - return addr >= VMALLOC_START && addr < VMALLOC_END; -#else - return 0; -#endif -} -#ifdef CONFIG_MMU -extern int is_vmalloc_or_module_addr(const void *x); -#else -static inline int is_vmalloc_or_module_addr(const void *x) -{ - return 0; -} -#endif - -static inline void compound_lock(struct page *page) -{ -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - bit_spin_lock(PG_compound_lock, &page->flags); -#endif -} - -static inline void compound_unlock(struct page *page) -{ -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - bit_spin_unlock(PG_compound_lock, &page->flags); -#endif -} - -static inline unsigned long compound_lock_irqsave(struct page *page) -{ - unsigned long uninitialized_var(flags); -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - local_irq_save(flags); - compound_lock(page); -#endif - return flags; -} - -static inline void compound_unlock_irqrestore(struct page *page, - unsigned long flags) -{ -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - compound_unlock(page); - local_irq_restore(flags); -#endif -} - -static inline struct page *compound_head(struct page *page) -{ - if (unlikely(PageTail(page))) - return page->first_page; - return page; -} - -/* - * The atomic page->_mapcount, starts from -1: so that transitions - * both from it and to it can be tracked, using atomic_inc_and_test - * and atomic_add_negative(-1). - */ -static inline void reset_page_mapcount(struct page *page) -{ - atomic_set(&(page)->_mapcount, -1); -} - -static inline int page_mapcount(struct page *page) -{ - return atomic_read(&(page)->_mapcount) + 1; -} - -static inline int page_count(struct page *page) -{ - return atomic_read(&compound_head(page)->_count); -} - -static inline void get_huge_page_tail(struct page *page) -{ - /* - * __split_huge_page_refcount() cannot run - * from under us. - */ - VM_BUG_ON(page_mapcount(page) < 0); - VM_BUG_ON(atomic_read(&page->_count) != 0); - atomic_inc(&page->_mapcount); -} - -extern bool __get_page_tail(struct page *page); - -static inline void get_page(struct page *page) -{ - if (unlikely(PageTail(page))) - if (likely(__get_page_tail(page))) - return; - /* - * Getting a normal page or the head of a compound page - * requires to already have an elevated page->_count. - */ - VM_BUG_ON(atomic_read(&page->_count) <= 0); - atomic_inc(&page->_count); -} - -static inline struct page *virt_to_head_page(const void *x) -{ - struct page *page = virt_to_page(x); - return compound_head(page); -} - -/* - * Setup the page count before being freed into the page allocator for - * the first time (boot or memory hotplug) - */ -static inline void init_page_count(struct page *page) -{ - atomic_set(&page->_count, 1); -} - -/* - * PageBuddy() indicate that the page is free and in the buddy system - * (see mm/page_alloc.c). - * - * PAGE_BUDDY_MAPCOUNT_VALUE must be <= -2 but better not too close to - * -2 so that an underflow of the page_mapcount() won't be mistaken - * for a genuine PAGE_BUDDY_MAPCOUNT_VALUE. -128 can be created very - * efficiently by most CPU architectures. - */ -#define PAGE_BUDDY_MAPCOUNT_VALUE (-128) - -static inline int PageBuddy(struct page *page) -{ - return atomic_read(&page->_mapcount) == PAGE_BUDDY_MAPCOUNT_VALUE; -} - -static inline void __SetPageBuddy(struct page *page) -{ - VM_BUG_ON(atomic_read(&page->_mapcount) != -1); - atomic_set(&page->_mapcount, PAGE_BUDDY_MAPCOUNT_VALUE); -} - -static inline void __ClearPageBuddy(struct page *page) -{ - VM_BUG_ON(!PageBuddy(page)); - atomic_set(&page->_mapcount, -1); -} - -void put_page(struct page *page); -void put_pages_list(struct list_head *pages); - -void split_page(struct page *page, unsigned int order); -int split_free_page(struct page *page); - -/* - * Compound pages have a destructor function. Provide a - * prototype for that function and accessor functions. - * These are _only_ valid on the head of a PG_compound page. - */ -typedef void compound_page_dtor(struct page *); - -static inline void set_compound_page_dtor(struct page *page, - compound_page_dtor *dtor) -{ - page[1].lru.next = (void *)dtor; -} - -static inline compound_page_dtor *get_compound_page_dtor(struct page *page) -{ - return (compound_page_dtor *)page[1].lru.next; -} - -static inline int compound_order(struct page *page) -{ - if (!PageHead(page)) - return 0; - return (unsigned long)page[1].lru.prev; -} - -static inline int compound_trans_order(struct page *page) -{ - int order; - unsigned long flags; - - if (!PageHead(page)) - return 0; - - flags = compound_lock_irqsave(page); - order = compound_order(page); - compound_unlock_irqrestore(page, flags); - return order; -} - -static inline void set_compound_order(struct page *page, unsigned long order) -{ - page[1].lru.prev = (void *)order; -} - -#ifdef CONFIG_MMU -/* - * Do pte_mkwrite, but only if the vma says VM_WRITE. We do this when - * servicing faults for write access. In the normal case, do always want - * pte_mkwrite. But get_user_pages can cause write faults for mappings - * that do not have writing enabled, when used by access_process_vm. - */ -static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) -{ - if (likely(vma->vm_flags & VM_WRITE)) - pte = pte_mkwrite(pte); - return pte; -} -#endif - -/* - * Multiple processes may "see" the same page. E.g. for untouched - * mappings of /dev/null, all processes see the same page full of - * zeroes, and text pages of executables and shared libraries have - * only one copy in memory, at most, normally. - * - * For the non-reserved pages, page_count(page) denotes a reference count. - * page_count() == 0 means the page is free. page->lru is then used for - * freelist management in the buddy allocator. - * page_count() > 0 means the page has been allocated. - * - * Pages are allocated by the slab allocator in order to provide memory - * to kmalloc and kmem_cache_alloc. In this case, the management of the - * page, and the fields in 'struct page' are the responsibility of mm/slab.c - * unless a particular usage is carefully commented. (the responsibility of - * freeing the kmalloc memory is the caller's, of course). - * - * A page may be used by anyone else who does a __get_free_page(). - * In this case, page_count still tracks the references, and should only - * be used through the normal accessor functions. The top bits of page->flags - * and page->virtual store page management information, but all other fields - * are unused and could be used privately, carefully. The management of this - * page is the responsibility of the one who allocated it, and those who have - * subsequently been given references to it. - * - * The other pages (we may call them "pagecache pages") are completely - * managed by the Linux memory manager: I/O, buffers, swapping etc. - * The following discussion applies only to them. - * - * A pagecache page contains an opaque `private' member, which belongs to the - * page's address_space. Usually, this is the address of a circular list of - * the page's disk buffers. PG_private must be set to tell the VM to call - * into the filesystem to release these pages. - * - * A page may belong to an inode's memory mapping. In this case, page->mapping - * is the pointer to the inode, and page->index is the file offset of the page, - * in units of PAGE_CACHE_SIZE. - * - * If pagecache pages are not associated with an inode, they are said to be - * anonymous pages. These may become associated with the swapcache, and in that - * case PG_swapcache is set, and page->private is an offset into the swapcache. - * - * In either case (swapcache or inode backed), the pagecache itself holds one - * reference to the page. Setting PG_private should also increment the - * refcount. The each user mapping also has a reference to the page. - * - * The pagecache pages are stored in a per-mapping radix tree, which is - * rooted at mapping->page_tree, and indexed by offset. - * Where 2.4 and early 2.6 kernels kept dirty/clean pages in per-address_space - * lists, we instead now tag pages as dirty/writeback in the radix tree. - * - * All pagecache pages may be subject to I/O: - * - inode pages may need to be read from disk, - * - inode pages which have been modified and are MAP_SHARED may need - * to be written back to the inode on disk, - * - anonymous pages (including MAP_PRIVATE file mappings) which have been - * modified may need to be swapped out to swap space and (later) to be read - * back into memory. - */ - -/* - * The zone field is never updated after free_area_init_core() - * sets it, so none of the operations on it need to be atomic. - */ - - -/* - * page->flags layout: - * - * There are three possibilities for how page->flags get - * laid out. The first is for the normal case, without - * sparsemem. The second is for sparsemem when there is - * plenty of space for node and section. The last is when - * we have run out of space and have to fall back to an - * alternate (slower) way of determining the node. - * - * No sparsemem or sparsemem vmemmap: | NODE | ZONE | ... | FLAGS | - * classic sparse with space for node:| SECTION | NODE | ZONE | ... | FLAGS | - * classic sparse no space for node: | SECTION | ZONE | ... | FLAGS | - */ -#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) -#define SECTIONS_WIDTH SECTIONS_SHIFT -#else -#define SECTIONS_WIDTH 0 -#endif - -#define ZONES_WIDTH ZONES_SHIFT - -#if SECTIONS_WIDTH+ZONES_WIDTH+NODES_SHIFT <= BITS_PER_LONG - NR_PAGEFLAGS -#define NODES_WIDTH NODES_SHIFT -#else -#ifdef CONFIG_SPARSEMEM_VMEMMAP -#error "Vmemmap: No space for nodes field in page flags" -#endif -#define NODES_WIDTH 0 -#endif - -/* Page flags: | [SECTION] | [NODE] | ZONE | ... | FLAGS | */ -#define SECTIONS_PGOFF ((sizeof(unsigned long)*8) - SECTIONS_WIDTH) -#define NODES_PGOFF (SECTIONS_PGOFF - NODES_WIDTH) -#define ZONES_PGOFF (NODES_PGOFF - ZONES_WIDTH) - -/* - * We are going to use the flags for the page to node mapping if its in - * there. This includes the case where there is no node, so it is implicit. - */ -#if !(NODES_WIDTH > 0 || NODES_SHIFT == 0) -#define NODE_NOT_IN_PAGE_FLAGS -#endif - -/* - * Define the bit shifts to access each section. For non-existent - * sections we define the shift as 0; that plus a 0 mask ensures - * the compiler will optimise away reference to them. - */ -#define SECTIONS_PGSHIFT (SECTIONS_PGOFF * (SECTIONS_WIDTH != 0)) -#define NODES_PGSHIFT (NODES_PGOFF * (NODES_WIDTH != 0)) -#define ZONES_PGSHIFT (ZONES_PGOFF * (ZONES_WIDTH != 0)) - -/* NODE:ZONE or SECTION:ZONE is used to ID a zone for the buddy allocator */ -#ifdef NODE_NOT_IN_PAGE_FLAGS -#define ZONEID_SHIFT (SECTIONS_SHIFT + ZONES_SHIFT) -#define ZONEID_PGOFF ((SECTIONS_PGOFF < ZONES_PGOFF)? \ - SECTIONS_PGOFF : ZONES_PGOFF) -#else -#define ZONEID_SHIFT (NODES_SHIFT + ZONES_SHIFT) -#define ZONEID_PGOFF ((NODES_PGOFF < ZONES_PGOFF)? \ - NODES_PGOFF : ZONES_PGOFF) -#endif - -#define ZONEID_PGSHIFT (ZONEID_PGOFF * (ZONEID_SHIFT != 0)) - -#if SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS -#error SECTIONS_WIDTH+NODES_WIDTH+ZONES_WIDTH > BITS_PER_LONG - NR_PAGEFLAGS -#endif - -#define ZONES_MASK ((1UL << ZONES_WIDTH) - 1) -#define NODES_MASK ((1UL << NODES_WIDTH) - 1) -#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1) -#define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) - -static inline enum zone_type page_zonenum(const struct page *page) -{ - return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK; -} - -/* - * The identification function is only used by the buddy allocator for - * determining if two pages could be buddies. We are not really - * identifying a zone since we could be using a the section number - * id if we have not node id available in page flags. - * We guarantee only that it will return the same value for two - * combinable pages in a zone. - */ -static inline int page_zone_id(struct page *page) -{ - return (page->flags >> ZONEID_PGSHIFT) & ZONEID_MASK; -} - -static inline int zone_to_nid(struct zone *zone) -{ -#ifdef CONFIG_NUMA - return zone->node; -#else - return 0; -#endif -} - -#ifdef NODE_NOT_IN_PAGE_FLAGS -extern int page_to_nid(const struct page *page); -#else -static inline int page_to_nid(const struct page *page) -{ - return (page->flags >> NODES_PGSHIFT) & NODES_MASK; -} -#endif - -static inline struct zone *page_zone(const struct page *page) -{ - return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)]; -} - -#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) -static inline void set_page_section(struct page *page, unsigned long section) -{ - page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); - page->flags |= (section & SECTIONS_MASK) << SECTIONS_PGSHIFT; -} - -static inline unsigned long page_to_section(const struct page *page) -{ - return (page->flags >> SECTIONS_PGSHIFT) & SECTIONS_MASK; -} -#endif - -static inline void set_page_zone(struct page *page, enum zone_type zone) -{ - page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT); - page->flags |= (zone & ZONES_MASK) << ZONES_PGSHIFT; -} - -static inline void set_page_node(struct page *page, unsigned long node) -{ - page->flags &= ~(NODES_MASK << NODES_PGSHIFT); - page->flags |= (node & NODES_MASK) << NODES_PGSHIFT; -} - -static inline void set_page_links(struct page *page, enum zone_type zone, - unsigned long node, unsigned long pfn) -{ - set_page_zone(page, zone); - set_page_node(page, node); -#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP) - set_page_section(page, pfn_to_section_nr(pfn)); -#endif -} - -/* - * Some inline functions in vmstat.h depend on page_zone() - */ -#include <linux/vmstat.h> - -static __always_inline void *lowmem_page_address(const struct page *page) -{ - return __va(PFN_PHYS(page_to_pfn(page))); -} - -#if defined(CONFIG_HIGHMEM) && !defined(WANT_PAGE_VIRTUAL) -#define HASHED_PAGE_VIRTUAL -#endif - -#if defined(WANT_PAGE_VIRTUAL) -#define page_address(page) ((page)->virtual) -#define set_page_address(page, address) \ - do { \ - (page)->virtual = (address); \ - } while(0) -#define page_address_init() do { } while(0) -#endif - -#if defined(HASHED_PAGE_VIRTUAL) -void *page_address(const struct page *page); -void set_page_address(struct page *page, void *virtual); -void page_address_init(void); -#endif - -#if !defined(HASHED_PAGE_VIRTUAL) && !defined(WANT_PAGE_VIRTUAL) -#define page_address(page) lowmem_page_address(page) -#define set_page_address(page, address) do { } while(0) -#define page_address_init() do { } while(0) -#endif - -/* - * On an anonymous page mapped into a user virtual memory area, - * page->mapping points to its anon_vma, not to a struct address_space; - * with the PAGE_MAPPING_ANON bit set to distinguish it. See rmap.h. - * - * On an anonymous page in a VM_MERGEABLE area, if CONFIG_KSM is enabled, - * the PAGE_MAPPING_KSM bit may be set along with the PAGE_MAPPING_ANON bit; - * and then page->mapping points, not to an anon_vma, but to a private - * structure which KSM associates with that merged page. See ksm.h. - * - * PAGE_MAPPING_KSM without PAGE_MAPPING_ANON is currently never used. - * - * Please note that, confusingly, "page_mapping" refers to the inode - * address_space which maps the page from disk; whereas "page_mapped" - * refers to user virtual address space into which the page is mapped. - */ -#define PAGE_MAPPING_ANON 1 -#define PAGE_MAPPING_KSM 2 -#define PAGE_MAPPING_FLAGS (PAGE_MAPPING_ANON | PAGE_MAPPING_KSM) - -extern struct address_space swapper_space; -static inline struct address_space *page_mapping(struct page *page) -{ - struct address_space *mapping = page->mapping; - - VM_BUG_ON(PageSlab(page)); - if (unlikely(PageSwapCache(page))) - mapping = &swapper_space; - else if ((unsigned long)mapping & PAGE_MAPPING_ANON) - mapping = NULL; - return mapping; -} - -/* Neutral page->mapping pointer to address_space or anon_vma or other */ -static inline void *page_rmapping(struct page *page) -{ - return (void *)((unsigned long)page->mapping & ~PAGE_MAPPING_FLAGS); -} - -static inline int PageAnon(struct page *page) -{ - return ((unsigned long)page->mapping & PAGE_MAPPING_ANON) != 0; -} - -/* - * Return the pagecache index of the passed page. Regular pagecache pages - * use ->index whereas swapcache pages use ->private - */ -static inline pgoff_t page_index(struct page *page) -{ - if (unlikely(PageSwapCache(page))) - return page_private(page); - return page->index; -} - -/* - * Return true if this page is mapped into pagetables. - */ -static inline int page_mapped(struct page *page) -{ - return atomic_read(&(page)->_mapcount) >= 0; -} - -/* - * Different kinds of faults, as returned by handle_mm_fault(). - * Used to decide whether a process gets delivered SIGBUS or - * just gets major/minor fault counters bumped up. - */ - -#define VM_FAULT_MINOR 0 /* For backwards compat. Remove me quickly. */ - -#define VM_FAULT_OOM 0x0001 -#define VM_FAULT_SIGBUS 0x0002 -#define VM_FAULT_MAJOR 0x0004 -#define VM_FAULT_WRITE 0x0008 /* Special case for get_user_pages */ -#define VM_FAULT_HWPOISON 0x0010 /* Hit poisoned small page */ -#define VM_FAULT_HWPOISON_LARGE 0x0020 /* Hit poisoned large page. Index encoded in upper bits */ - -#define VM_FAULT_NOPAGE 0x0100 /* ->fault installed the pte, not return page */ -#define VM_FAULT_LOCKED 0x0200 /* ->fault locked the returned page */ -#define VM_FAULT_RETRY 0x0400 /* ->fault blocked, must retry */ - -#define VM_FAULT_HWPOISON_LARGE_MASK 0xf000 /* encodes hpage index for large hwpoison */ - -#define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON | \ - VM_FAULT_HWPOISON_LARGE) - -/* Encode hstate index for a hwpoisoned large page */ -#define VM_FAULT_SET_HINDEX(x) ((x) << 12) -#define VM_FAULT_GET_HINDEX(x) (((x) >> 12) & 0xf) - -/* - * Can be called by the pagefault handler when it gets a VM_FAULT_OOM. - */ -extern void pagefault_out_of_memory(void); - -#define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) - -/* - * Flags passed to show_mem() and show_free_areas() to suppress output in - * various contexts. - */ -#define SHOW_MEM_FILTER_NODES (0x0001u) /* filter disallowed nodes */ - -extern void show_free_areas(unsigned int flags); -extern bool skip_free_areas_node(unsigned int flags, int nid); - -int shmem_lock(struct file *file, int lock, struct user_struct *user); -struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags); -void shmem_set_file(struct vm_area_struct *vma, struct file *file); -int shmem_zero_setup(struct vm_area_struct *); - -extern int can_do_mlock(void); -extern int user_shm_lock(size_t, struct user_struct *); -extern void user_shm_unlock(size_t, struct user_struct *); - -/* - * Parameter block passed down to zap_pte_range in exceptional cases. - */ -struct zap_details { - struct vm_area_struct *nonlinear_vma; /* Check page->index if set */ - struct address_space *check_mapping; /* Check page->mapping if set */ - pgoff_t first_index; /* Lowest page->index to unmap */ - pgoff_t last_index; /* Highest page->index to unmap */ -}; - -struct page *vm_normal_page(struct vm_area_struct *vma, unsigned long addr, - pte_t pte); - -int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address, - unsigned long size); -void zap_page_range(struct vm_area_struct *vma, unsigned long address, - unsigned long size, struct zap_details *); -void unmap_vmas(struct mmu_gather *tlb, - struct vm_area_struct *start_vma, unsigned long start_addr, - unsigned long end_addr, unsigned long *nr_accounted, - struct zap_details *); - -/** - * mm_walk - callbacks for walk_page_range - * @pgd_entry: if set, called for each non-empty PGD (top-level) entry - * @pud_entry: if set, called for each non-empty PUD (2nd-level) entry - * @pmd_entry: if set, called for each non-empty PMD (3rd-level) entry - * this handler is required to be able to handle - * pmd_trans_huge() pmds. They may simply choose to - * split_huge_page() instead of handling it explicitly. - * @pte_entry: if set, called for each non-empty PTE (4th-level) entry - * @pte_hole: if set, called for each hole at all levels - * @hugetlb_entry: if set, called for each hugetlb entry - * *Caution*: The caller must hold mmap_sem() if @hugetlb_entry - * is used. - * - * (see walk_page_range for more details) - */ -struct mm_walk { - int (*pgd_entry)(pgd_t *, unsigned long, unsigned long, struct mm_walk *); - int (*pud_entry)(pud_t *, unsigned long, unsigned long, struct mm_walk *); - int (*pmd_entry)(pmd_t *, unsigned long, unsigned long, struct mm_walk *); - int (*pte_entry)(pte_t *, unsigned long, unsigned long, struct mm_walk *); - int (*pte_hole)(unsigned long, unsigned long, struct mm_walk *); - int (*hugetlb_entry)(pte_t *, unsigned long, - unsigned long, unsigned long, struct mm_walk *); - struct mm_struct *mm; - void *private; -}; - -int walk_page_range(unsigned long addr, unsigned long end, - struct mm_walk *walk); -void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, - unsigned long end, unsigned long floor, unsigned long ceiling); -int copy_page_range(struct mm_struct *dst, struct mm_struct *src, - struct vm_area_struct *vma); -void unmap_mapping_range(struct address_space *mapping, - loff_t const holebegin, loff_t const holelen, int even_cows); -int follow_pfn(struct vm_area_struct *vma, unsigned long address, - unsigned long *pfn); -int follow_phys(struct vm_area_struct *vma, unsigned long address, - unsigned int flags, unsigned long *prot, resource_size_t *phys); -int generic_access_phys(struct vm_area_struct *vma, unsigned long addr, - void *buf, int len, int write); - -static inline void unmap_shared_mapping_range(struct address_space *mapping, - loff_t const holebegin, loff_t const holelen) -{ - unmap_mapping_range(mapping, holebegin, holelen, 0); -} - -extern void truncate_pagecache(struct inode *inode, loff_t old, loff_t new); -extern void truncate_setsize(struct inode *inode, loff_t newsize); -extern int vmtruncate(struct inode *inode, loff_t offset); -extern int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end); -void truncate_pagecache_range(struct inode *inode, loff_t offset, loff_t end); -int truncate_inode_page(struct address_space *mapping, struct page *page); -int generic_error_remove_page(struct address_space *mapping, struct page *page); - -int invalidate_inode_page(struct page *page); - -#ifdef CONFIG_MMU -extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, - unsigned long address, unsigned int flags); -extern int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm, - unsigned long address, unsigned int fault_flags); -#else -static inline int handle_mm_fault(struct mm_struct *mm, - struct vm_area_struct *vma, unsigned long address, - unsigned int flags) -{ - /* should never happen if there's no MMU */ - BUG(); - return VM_FAULT_SIGBUS; -} -static inline int fixup_user_fault(struct task_struct *tsk, - struct mm_struct *mm, unsigned long address, - unsigned int fault_flags) -{ - /* should never happen if there's no MMU */ - BUG(); - return -EFAULT; -} -#endif - -extern int make_pages_present(unsigned long addr, unsigned long end); -extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); -extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, - void *buf, int len, int write); - -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, - int *nonblocking); -int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, - unsigned long start, int nr_pages, int write, int force, - struct page **pages, struct vm_area_struct **vmas); -int get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages); -struct page *get_dump_page(unsigned long addr); - -extern int try_to_release_page(struct page * page, gfp_t gfp_mask); -extern void do_invalidatepage(struct page *page, unsigned long offset); - -int __set_page_dirty_nobuffers(struct page *page); -int __set_page_dirty_no_writeback(struct page *page); -int redirty_page_for_writepage(struct writeback_control *wbc, - struct page *page); -void account_page_dirtied(struct page *page, struct address_space *mapping); -void account_page_writeback(struct page *page); -int set_page_dirty(struct page *page); -int set_page_dirty_lock(struct page *page); -int clear_page_dirty_for_io(struct page *page); - -/* Is the vma a continuation of the stack vma above it? */ -static inline int vma_growsdown(struct vm_area_struct *vma, unsigned long addr) -{ - return vma && (vma->vm_end == addr) && (vma->vm_flags & VM_GROWSDOWN); -} - -static inline int stack_guard_page_start(struct vm_area_struct *vma, - unsigned long addr) -{ - return (vma->vm_flags & VM_GROWSDOWN) && - (vma->vm_start == addr) && - !vma_growsdown(vma->vm_prev, addr); -} - -/* Is the vma a continuation of the stack vma below it? */ -static inline int vma_growsup(struct vm_area_struct *vma, unsigned long addr) -{ - return vma && (vma->vm_start == addr) && (vma->vm_flags & VM_GROWSUP); -} - -static inline int stack_guard_page_end(struct vm_area_struct *vma, - unsigned long addr) -{ - return (vma->vm_flags & VM_GROWSUP) && - (vma->vm_end == addr) && - !vma_growsup(vma->vm_next, addr); -} - -extern pid_t -vm_is_stack(struct task_struct *task, struct vm_area_struct *vma, int in_group); - -extern unsigned long move_page_tables(struct vm_area_struct *vma, - unsigned long old_addr, struct vm_area_struct *new_vma, - unsigned long new_addr, unsigned long len); -extern unsigned long do_mremap(unsigned long addr, - unsigned long old_len, unsigned long new_len, - unsigned long flags, unsigned long new_addr); -extern int mprotect_fixup(struct vm_area_struct *vma, - struct vm_area_struct **pprev, unsigned long start, - unsigned long end, unsigned long newflags); - -/* - * doesn't attempt to fault and will return short. - */ -int __get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages); -/* - * per-process(per-mm_struct) statistics. - */ -static inline unsigned long get_mm_counter(struct mm_struct *mm, int member) -{ - long val = atomic_long_read(&mm->rss_stat.count[member]); - -#ifdef SPLIT_RSS_COUNTING - /* - * counter is updated in asynchronous manner and may go to minus. - * But it's never be expected number for users. - */ - if (val < 0) - val = 0; -#endif - return (unsigned long)val; -} - -static inline void add_mm_counter(struct mm_struct *mm, int member, long value) -{ - atomic_long_add(value, &mm->rss_stat.count[member]); -} - -static inline void inc_mm_counter(struct mm_struct *mm, int member) -{ - atomic_long_inc(&mm->rss_stat.count[member]); -} - -static inline void dec_mm_counter(struct mm_struct *mm, int member) -{ - atomic_long_dec(&mm->rss_stat.count[member]); -} - -static inline unsigned long get_mm_rss(struct mm_struct *mm) -{ - return get_mm_counter(mm, MM_FILEPAGES) + - get_mm_counter(mm, MM_ANONPAGES); -} - -static inline unsigned long get_mm_hiwater_rss(struct mm_struct *mm) -{ - return max(mm->hiwater_rss, get_mm_rss(mm)); -} - -static inline unsigned long get_mm_hiwater_vm(struct mm_struct *mm) -{ - return max(mm->hiwater_vm, mm->total_vm); -} - -static inline void update_hiwater_rss(struct mm_struct *mm) -{ - unsigned long _rss = get_mm_rss(mm); - - if ((mm)->hiwater_rss < _rss) - (mm)->hiwater_rss = _rss; -} - -static inline void update_hiwater_vm(struct mm_struct *mm) -{ - if (mm->hiwater_vm < mm->total_vm) - mm->hiwater_vm = mm->total_vm; -} - -static inline void setmax_mm_hiwater_rss(unsigned long *maxrss, - struct mm_struct *mm) -{ - unsigned long hiwater_rss = get_mm_hiwater_rss(mm); - - if (*maxrss < hiwater_rss) - *maxrss = hiwater_rss; -} - -#if defined(SPLIT_RSS_COUNTING) -void sync_mm_rss(struct mm_struct *mm); -#else -static inline void sync_mm_rss(struct mm_struct *mm) -{ -} -#endif - -int vma_wants_writenotify(struct vm_area_struct *vma); - -extern pte_t *__get_locked_pte(struct mm_struct *mm, unsigned long addr, - spinlock_t **ptl); -static inline pte_t *get_locked_pte(struct mm_struct *mm, unsigned long addr, - spinlock_t **ptl) -{ - pte_t *ptep; - __cond_lock(*ptl, ptep = __get_locked_pte(mm, addr, ptl)); - return ptep; -} - -#ifdef __PAGETABLE_PUD_FOLDED -static inline int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, - unsigned long address) -{ - return 0; -} -#else -int __pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address); -#endif - -#ifdef __PAGETABLE_PMD_FOLDED -static inline int __pmd_alloc(struct mm_struct *mm, pud_t *pud, - unsigned long address) -{ - return 0; -} -#else -int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address); -#endif - -int __pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, - pmd_t *pmd, unsigned long address); -int __pte_alloc_kernel(pmd_t *pmd, unsigned long address); - -/* - * The following ifdef needed to get the 4level-fixup.h header to work. - * Remove it when 4level-fixup.h has been removed. - */ -#if defined(CONFIG_MMU) && !defined(__ARCH_HAS_4LEVEL_HACK) -static inline pud_t *pud_alloc(struct mm_struct *mm, pgd_t *pgd, unsigned long address) -{ - return (unlikely(pgd_none(*pgd)) && __pud_alloc(mm, pgd, address))? - NULL: pud_offset(pgd, address); -} - -static inline pmd_t *pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) -{ - return (unlikely(pud_none(*pud)) && __pmd_alloc(mm, pud, address))? - NULL: pmd_offset(pud, address); -} -#endif /* CONFIG_MMU && !__ARCH_HAS_4LEVEL_HACK */ - -#if USE_SPLIT_PTLOCKS -/* - * We tuck a spinlock to guard each pagetable page into its struct page, - * at page->private, with BUILD_BUG_ON to make sure that this will not - * overflow into the next struct page (as it might with DEBUG_SPINLOCK). - * When freeing, reset page->mapping so free_pages_check won't complain. - */ -#define __pte_lockptr(page) &((page)->ptl) -#define pte_lock_init(_page) do { \ - spin_lock_init(__pte_lockptr(_page)); \ -} while (0) -#define pte_lock_deinit(page) ((page)->mapping = NULL) -#define pte_lockptr(mm, pmd) ({(void)(mm); __pte_lockptr(pmd_page(*(pmd)));}) -#else /* !USE_SPLIT_PTLOCKS */ -/* - * We use mm->page_table_lock to guard all pagetable pages of the mm. - */ -#define pte_lock_init(page) do {} while (0) -#define pte_lock_deinit(page) do {} while (0) -#define pte_lockptr(mm, pmd) ({(void)(pmd); &(mm)->page_table_lock;}) -#endif /* USE_SPLIT_PTLOCKS */ - -static inline void pgtable_page_ctor(struct page *page) -{ - pte_lock_init(page); - inc_zone_page_state(page, NR_PAGETABLE); -} - -static inline void pgtable_page_dtor(struct page *page) -{ - pte_lock_deinit(page); - dec_zone_page_state(page, NR_PAGETABLE); -} - -#define pte_offset_map_lock(mm, pmd, address, ptlp) \ -({ \ - spinlock_t *__ptl = pte_lockptr(mm, pmd); \ - pte_t *__pte = pte_offset_map(pmd, address); \ - *(ptlp) = __ptl; \ - spin_lock(__ptl); \ - __pte; \ -}) - -#define pte_unmap_unlock(pte, ptl) do { \ - spin_unlock(ptl); \ - pte_unmap(pte); \ -} while (0) - -#define pte_alloc_map(mm, vma, pmd, address) \ - ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, vma, \ - pmd, address))? \ - NULL: pte_offset_map(pmd, address)) - -#define pte_alloc_map_lock(mm, pmd, address, ptlp) \ - ((unlikely(pmd_none(*(pmd))) && __pte_alloc(mm, NULL, \ - pmd, address))? \ - NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) - -#define pte_alloc_kernel(pmd, address) \ - ((unlikely(pmd_none(*(pmd))) && __pte_alloc_kernel(pmd, address))? \ - NULL: pte_offset_kernel(pmd, address)) - -extern void free_area_init(unsigned long * zones_size); -extern void free_area_init_node(int nid, unsigned long * zones_size, - unsigned long zone_start_pfn, unsigned long *zholes_size); -extern void free_initmem(void); - -#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP -/* - * With CONFIG_HAVE_MEMBLOCK_NODE_MAP set, an architecture may initialise its - * zones, allocate the backing mem_map and account for memory holes in a more - * architecture independent manner. This is a substitute for creating the - * zone_sizes[] and zholes_size[] arrays and passing them to - * free_area_init_node() - * - * An architecture is expected to register range of page frames backed by - * physical memory with memblock_add[_node]() before calling - * free_area_init_nodes() passing in the PFN each zone ends at. At a basic - * usage, an architecture is expected to do something like - * - * unsigned long max_zone_pfns[MAX_NR_ZONES] = {max_dma, max_normal_pfn, - * max_highmem_pfn}; - * for_each_valid_physical_page_range() - * memblock_add_node(base, size, nid) - * free_area_init_nodes(max_zone_pfns); - * - * free_bootmem_with_active_regions() calls free_bootmem_node() for each - * registered physical page range. Similarly - * sparse_memory_present_with_active_regions() calls memory_present() for - * each range when SPARSEMEM is enabled. - * - * See mm/page_alloc.c for more information on each function exposed by - * CONFIG_HAVE_MEMBLOCK_NODE_MAP. - */ -extern void free_area_init_nodes(unsigned long *max_zone_pfn); -unsigned long node_map_pfn_alignment(void); -unsigned long __absent_pages_in_range(int nid, unsigned long start_pfn, - unsigned long end_pfn); -extern unsigned long absent_pages_in_range(unsigned long start_pfn, - unsigned long end_pfn); -extern void get_pfn_range_for_nid(unsigned int nid, - unsigned long *start_pfn, unsigned long *end_pfn); -extern unsigned long find_min_pfn_with_active_regions(void); -extern void free_bootmem_with_active_regions(int nid, - unsigned long max_low_pfn); -extern void sparse_memory_present_with_active_regions(int nid); - -#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ - -#if !defined(CONFIG_HAVE_MEMBLOCK_NODE_MAP) && \ - !defined(CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID) -static inline int __early_pfn_to_nid(unsigned long pfn) -{ - return 0; -} -#else -/* please see mm/page_alloc.c */ -extern int __meminit early_pfn_to_nid(unsigned long pfn); -#ifdef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID -/* there is a per-arch backend function. */ -extern int __meminit __early_pfn_to_nid(unsigned long pfn); -#endif /* CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID */ -#endif - -extern void set_dma_reserve(unsigned long new_dma_reserve); -extern void memmap_init_zone(unsigned long, int, unsigned long, - unsigned long, enum memmap_context); -extern void setup_per_zone_wmarks(void); -extern int __meminit init_per_zone_wmark_min(void); -extern void mem_init(void); -extern void __init mmap_init(void); -extern void show_mem(unsigned int flags); -extern void si_meminfo(struct sysinfo * val); -extern void si_meminfo_node(struct sysinfo *val, int nid); -extern int after_bootmem; - -extern __printf(3, 4) -void warn_alloc_failed(gfp_t gfp_mask, int order, const char *fmt, ...); - -extern void setup_per_cpu_pageset(void); - -extern void zone_pcp_update(struct zone *zone); - -/* nommu.c */ -extern atomic_long_t mmap_pages_allocated; -extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); - -/* prio_tree.c */ -void vma_prio_tree_add(struct vm_area_struct *, struct vm_area_struct *old); -void vma_prio_tree_insert(struct vm_area_struct *, struct prio_tree_root *); -void vma_prio_tree_remove(struct vm_area_struct *, struct prio_tree_root *); -struct vm_area_struct *vma_prio_tree_next(struct vm_area_struct *vma, - struct prio_tree_iter *iter); - -#define vma_prio_tree_foreach(vma, iter, root, begin, end) \ - for (prio_tree_iter_init(iter, root, begin, end), vma = NULL; \ - (vma = vma_prio_tree_next(vma, iter)); ) - -static inline void vma_nonlinear_insert(struct vm_area_struct *vma, - struct list_head *list) -{ - vma->shared.vm_set.parent = NULL; - list_add_tail(&vma->shared.vm_set.list, list); -} - -/* mmap.c */ -extern int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin); -extern int vma_adjust(struct vm_area_struct *vma, unsigned long start, - unsigned long end, pgoff_t pgoff, struct vm_area_struct *insert); -extern struct vm_area_struct *vma_merge(struct mm_struct *, - struct vm_area_struct *prev, unsigned long addr, unsigned long end, - unsigned long vm_flags, struct anon_vma *, struct file *, pgoff_t, - struct mempolicy *); -extern struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *); -extern int split_vma(struct mm_struct *, - struct vm_area_struct *, unsigned long addr, int new_below); -extern int insert_vm_struct(struct mm_struct *, struct vm_area_struct *); -extern void __vma_link_rb(struct mm_struct *, struct vm_area_struct *, - struct rb_node **, struct rb_node *); -extern void unlink_file_vma(struct vm_area_struct *); -extern struct vm_area_struct *copy_vma(struct vm_area_struct **, - unsigned long addr, unsigned long len, pgoff_t pgoff); -extern void exit_mmap(struct mm_struct *); - -extern int mm_take_all_locks(struct mm_struct *mm); -extern void mm_drop_all_locks(struct mm_struct *mm); - -/* From fs/proc/base.c. callers must _not_ hold the mm's exe_file_lock */ -extern void added_exe_file_vma(struct mm_struct *mm); -extern void removed_exe_file_vma(struct mm_struct *mm); -extern void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file); -extern struct file *get_mm_exe_file(struct mm_struct *mm); - -extern int may_expand_vm(struct mm_struct *mm, unsigned long npages); -extern int install_special_mapping(struct mm_struct *mm, - unsigned long addr, unsigned long len, - unsigned long flags, struct page **pages); - -extern unsigned long get_unmapped_area(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); - -extern unsigned long mmap_region(struct file *file, unsigned long addr, - unsigned long len, unsigned long flags, - vm_flags_t vm_flags, unsigned long pgoff); -extern unsigned long do_mmap(struct file *, unsigned long, - unsigned long, unsigned long, - unsigned long, unsigned long); -extern int do_munmap(struct mm_struct *, unsigned long, size_t); - -/* These take the mm semaphore themselves */ -extern unsigned long vm_brk(unsigned long, unsigned long); -extern int vm_munmap(unsigned long, size_t); -extern unsigned long vm_mmap(struct file *, unsigned long, - unsigned long, unsigned long, - unsigned long, unsigned long); - -/* truncate.c */ -extern void truncate_inode_pages(struct address_space *, loff_t); -extern void truncate_inode_pages_range(struct address_space *, - loff_t lstart, loff_t lend); - -/* generic vm_area_ops exported for stackable file systems */ -extern int filemap_fault(struct vm_area_struct *, struct vm_fault *); - -/* mm/page-writeback.c */ -int write_one_page(struct page *page, int wait); -void task_dirty_inc(struct task_struct *tsk); - -/* readahead.c */ -#define VM_MAX_READAHEAD 128 /* kbytes */ -#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */ - -int force_page_cache_readahead(struct address_space *mapping, struct file *filp, - pgoff_t offset, unsigned long nr_to_read); - -void page_cache_sync_readahead(struct address_space *mapping, - struct file_ra_state *ra, - struct file *filp, - pgoff_t offset, - unsigned long size); - -void page_cache_async_readahead(struct address_space *mapping, - struct file_ra_state *ra, - struct file *filp, - struct page *pg, - pgoff_t offset, - unsigned long size); - -unsigned long max_sane_readahead(unsigned long nr); -unsigned long ra_submit(struct file_ra_state *ra, - struct address_space *mapping, - struct file *filp); - -/* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ -extern int expand_stack(struct vm_area_struct *vma, unsigned long address); - -/* CONFIG_STACK_GROWSUP still needs to to grow downwards at some places */ -extern int expand_downwards(struct vm_area_struct *vma, - unsigned long address); -#if VM_GROWSUP -extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); -#else - #define expand_upwards(vma, address) do { } while (0) -#endif - -/* Look up the first VMA which satisfies addr < vm_end, NULL if none. */ -extern struct vm_area_struct * find_vma(struct mm_struct * mm, unsigned long addr); -extern struct vm_area_struct * find_vma_prev(struct mm_struct * mm, unsigned long addr, - struct vm_area_struct **pprev); - -/* Look up the first VMA which intersects the interval start_addr..end_addr-1, - NULL if none. Assume start_addr < end_addr. */ -static inline struct vm_area_struct * find_vma_intersection(struct mm_struct * mm, unsigned long start_addr, unsigned long end_addr) -{ - struct vm_area_struct * vma = find_vma(mm,start_addr); - - if (vma && end_addr <= vma->vm_start) - vma = NULL; - return vma; -} - -static inline unsigned long vma_pages(struct vm_area_struct *vma) -{ - return (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; -} - -/* Look up the first VMA which exactly match the interval vm_start ... vm_end */ -static inline struct vm_area_struct *find_exact_vma(struct mm_struct *mm, - unsigned long vm_start, unsigned long vm_end) -{ - struct vm_area_struct *vma = find_vma(mm, vm_start); - - if (vma && (vma->vm_start != vm_start || vma->vm_end != vm_end)) - vma = NULL; - - return vma; -} - -#ifdef CONFIG_MMU -pgprot_t vm_get_page_prot(unsigned long vm_flags); -#else -static inline pgprot_t vm_get_page_prot(unsigned long vm_flags) -{ - return __pgprot(0); -} -#endif - -struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); -int remap_pfn_range(struct vm_area_struct *, unsigned long addr, - unsigned long pfn, unsigned long size, pgprot_t); -int vm_insert_page(struct vm_area_struct *, unsigned long addr, struct page *); -int vm_insert_pfn(struct vm_area_struct *vma, unsigned long addr, - unsigned long pfn); -int vm_insert_mixed(struct vm_area_struct *vma, unsigned long addr, - unsigned long pfn); - -struct page *follow_page(struct vm_area_struct *, unsigned long address, - unsigned int foll_flags); -#define FOLL_WRITE 0x01 /* check pte is writable */ -#define FOLL_TOUCH 0x02 /* mark page accessed */ -#define FOLL_GET 0x04 /* do get_page on page */ -#define FOLL_DUMP 0x08 /* give error on hole if it would be zero */ -#define FOLL_FORCE 0x10 /* get_user_pages read/write w/o permission */ -#define FOLL_NOWAIT 0x20 /* if a disk transfer is needed, start the IO - * and return without waiting upon it */ -#define FOLL_MLOCK 0x40 /* mark page as mlocked */ -#define FOLL_SPLIT 0x80 /* don't return transhuge pages, split them */ -#define FOLL_HWPOISON 0x100 /* check page is hwpoisoned */ - -typedef int (*pte_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr, - void *data); -extern int apply_to_page_range(struct mm_struct *mm, unsigned long address, - unsigned long size, pte_fn_t fn, void *data); - -#ifdef CONFIG_PROC_FS -void vm_stat_account(struct mm_struct *, unsigned long, struct file *, long); -#else -static inline void vm_stat_account(struct mm_struct *mm, - unsigned long flags, struct file *file, long pages) -{ -} -#endif /* CONFIG_PROC_FS */ - -#ifdef CONFIG_DEBUG_PAGEALLOC -extern void kernel_map_pages(struct page *page, int numpages, int enable); -#ifdef CONFIG_HIBERNATION -extern bool kernel_page_present(struct page *page); -#endif /* CONFIG_HIBERNATION */ -#else -static inline void -kernel_map_pages(struct page *page, int numpages, int enable) {} -#ifdef CONFIG_HIBERNATION -static inline bool kernel_page_present(struct page *page) { return true; } -#endif /* CONFIG_HIBERNATION */ -#endif - -extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); -#ifdef __HAVE_ARCH_GATE_AREA -int in_gate_area_no_mm(unsigned long addr); -int in_gate_area(struct mm_struct *mm, unsigned long addr); -#else -int in_gate_area_no_mm(unsigned long addr); -#define in_gate_area(mm, addr) ({(void)mm; in_gate_area_no_mm(addr);}) -#endif /* __HAVE_ARCH_GATE_AREA */ - -int drop_caches_sysctl_handler(struct ctl_table *, int, - void __user *, size_t *, loff_t *); -unsigned long shrink_slab(struct shrink_control *shrink, - unsigned long nr_pages_scanned, - unsigned long lru_pages); - -#ifndef CONFIG_MMU -#define randomize_va_space 0 -#else -extern int randomize_va_space; -#endif - -const char * arch_vma_name(struct vm_area_struct *vma); -void print_vma_addr(char *prefix, unsigned long rip); - -void sparse_mem_maps_populate_node(struct page **map_map, - unsigned long pnum_begin, - unsigned long pnum_end, - unsigned long map_count, - int nodeid); - -struct page *sparse_mem_map_populate(unsigned long pnum, int nid); -pgd_t *vmemmap_pgd_populate(unsigned long addr, int node); -pud_t *vmemmap_pud_populate(pgd_t *pgd, unsigned long addr, int node); -pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); -pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); -void *vmemmap_alloc_block(unsigned long size, int node); -void *vmemmap_alloc_block_buf(unsigned long size, int node); -void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); -int vmemmap_populate_basepages(struct page *start_page, - unsigned long pages, int node); -int vmemmap_populate(struct page *start_page, unsigned long pages, int node); -void vmemmap_populate_print_last(void); - - -enum mf_flags { - MF_COUNT_INCREASED = 1 << 0, - MF_ACTION_REQUIRED = 1 << 1, -}; -extern int memory_failure(unsigned long pfn, int trapno, int flags); -extern void memory_failure_queue(unsigned long pfn, int trapno, int flags); -extern int unpoison_memory(unsigned long pfn); -extern int sysctl_memory_failure_early_kill; -extern int sysctl_memory_failure_recovery; -extern void shake_page(struct page *p, int access); -extern atomic_long_t mce_bad_pages; -extern int soft_offline_page(struct page *page, int flags); - -extern void dump_page(struct page *page); - -#if defined(CONFIG_TRANSPARENT_HUGEPAGE) || defined(CONFIG_HUGETLBFS) -extern void clear_huge_page(struct page *page, - unsigned long addr, - unsigned int pages_per_huge_page); -extern void copy_user_huge_page(struct page *dst, struct page *src, - unsigned long addr, struct vm_area_struct *vma, - unsigned int pages_per_huge_page); -#endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ - -#ifdef CONFIG_DEBUG_PAGEALLOC -extern unsigned int _debug_guardpage_minorder; - -static inline unsigned int debug_guardpage_minorder(void) -{ - return _debug_guardpage_minorder; -} - -static inline bool page_is_guard(struct page *page) -{ - return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags); -} -#else -static inline unsigned int debug_guardpage_minorder(void) { return 0; } -static inline bool page_is_guard(struct page *page) { return false; } -#endif /* CONFIG_DEBUG_PAGEALLOC */ - -#endif /* __KERNEL__ */ -#endif /* _LINUX_MM_H */ |