| #ifndef _LINUX_MM_H |
| #define _LINUX_MM_H |
| |
| #include <linux/errno.h> |
| |
| #ifdef __KERNEL__ |
| |
| #include <linux/gfp.h> |
| #include <linux/list.h> |
| #include <linux/mmzone.h> |
| #include <linux/rbtree.h> |
| #include <linux/prio_tree.h> |
| #include <linux/debug_locks.h> |
| #include <linux/mm_types.h> |
| |
| struct mempolicy; |
| struct anon_vma; |
| struct file_ra_state; |
| struct user_struct; |
| struct writeback_control; |
| struct rlimit; |
| |
| #ifndef CONFIG_DISCONTIGMEM /* Don't use mapnrs, do it properly */ |
| extern unsigned long max_mapnr; |
| #endif |
| |
| extern unsigned long num_physpages; |
| 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 */ |
| #define VM_GROWSUP 0x00000200 |
| #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) */ |
| #define VM_MAPPED_COPY 0x01000000 /* T if mapped copy of data (nommu mmap) */ |
| #define VM_INSERTPAGE 0x02000000 /* The vma has had "vm_insert_page()" done on it */ |
| #define VM_ALWAYSDUMP 0x04000000 /* Always include in core dumps */ |
| |
| #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 */ |
| |
| #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 |
| */ |
| #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 */ |
| |
| /* |
| * 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> |
| |
| /* |
| * 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); |
| } |
| |
| /* 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 |
| } |
| |
| static inline struct page *compound_head(struct page *page) |
| { |
| if (unlikely(PageTail(page))) |
| return page->first_page; |
| return page; |
| } |
| |
| static inline int page_count(struct page *page) |
| { |
| return atomic_read(&compound_head(page)->_count); |
| } |
| |
| static inline void get_page(struct page *page) |
| { |
| page = compound_head(page); |
| 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); |
| } |
| |
| void put_page(struct page *page); |
| void put_pages_list(struct list_head *pages); |
| |
| void split_page(struct page *page, unsigned int order); |
| |
| /* |
| * 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 void set_compound_order(struct page *page, unsigned long order) |
| { |
| page[1].lru.prev = (void *)order; |
| } |
| |
| /* |
| * 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 |
| |
| #ifndef PFN_SECTION_SHIFT |
| #define PFN_SECTION_SHIFT 0 |
| #endif |
| |
| /* |
| * Define the bit shifts to access each section. For non-existant |
| * 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 allcator */ |
| #ifdef NODE_NOT_IN_PAGEFLAGS |
| #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(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(struct page *page); |
| #else |
| static inline int page_to_nid(struct page *page) |
| { |
| return (page->flags >> NODES_PGSHIFT) & NODES_MASK; |
| } |
| #endif |
| |
| static inline struct zone *page_zone(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 unsigned long page_to_section(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_section(struct page *page, unsigned long section) |
| { |
| page->flags &= ~(SECTIONS_MASK << SECTIONS_PGSHIFT); |
| page->flags |= (section & SECTIONS_MASK) << SECTIONS_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); |
| set_page_section(page, pfn_to_section_nr(pfn)); |
| } |
| |
| /* |
| * Some inline functions in vmstat.h depend on page_zone() |
| */ |
| #include <linux/vmstat.h> |
| |
| static __always_inline void *lowmem_page_address(struct page *page) |
| { |
| return __va(page_to_pfn(page) << PAGE_SHIFT); |
| } |
| |
| #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(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. |
| * |
| * 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 |
| |
| 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)); |
| #ifdef CONFIG_SWAP |
| if (unlikely(PageSwapCache(page))) |
| mapping = &swapper_space; |
| else |
| #endif |
| if (unlikely((unsigned long)mapping & PAGE_MAPPING_ANON)) |
| mapping = NULL; |
| return mapping; |
| } |
| |
| 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; |
| } |
| |
| /* |
| * The atomic page->_mapcount, like _count, 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; |
| } |
| |
| /* |
| * 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 page */ |
| |
| #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_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | VM_FAULT_HWPOISON) |
| |
| /* |
| * 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) |
| |
| extern void show_free_areas(void); |
| |
| #ifdef CONFIG_SHMEM |
| extern int shmem_lock(struct file *file, int lock, struct user_struct *user); |
| #else |
| static inline int shmem_lock(struct file *file, int lock, |
| struct user_struct *user) |
| { |
| return 0; |
| } |
| #endif |
| struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags); |
| |
| int shmem_zero_setup(struct vm_area_struct *); |
| |
| #ifndef CONFIG_MMU |
| extern unsigned long shmem_get_unmapped_area(struct file *file, |
| unsigned long addr, |
| unsigned long len, |
| unsigned long pgoff, |
| unsigned long flags); |
| #endif |
| |
| 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 */ |
| spinlock_t *i_mmap_lock; /* For unmap_mapping_range: */ |
| unsigned long truncate_count; /* Compare vm_truncate_count */ |
| }; |
| |
| 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); |
| unsigned long zap_page_range(struct vm_area_struct *vma, unsigned long address, |
| unsigned long size, struct zap_details *); |
| unsigned long 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 |
| * @pte_entry: if set, called for each non-empty PTE (4th-level) entry |
| * @pte_hole: if set, called for each hole at all levels |
| * |
| * (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 *); |
| 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 int vmtruncate(struct inode * inode, loff_t offset); |
| extern int vmtruncate_range(struct inode * inode, loff_t offset, loff_t end); |
| |
| #ifdef CONFIG_MMU |
| extern int handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma, |
| unsigned long address, unsigned int 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; |
| } |
| #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); |
| |
| 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); |
| |
| 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); |
| int set_page_dirty(struct page *page); |
| int set_page_dirty_lock(struct page *page); |
| int clear_page_dirty_for_io(struct page *page); |
| |
| 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); |
| |
| /* |
| * A callback you can register to apply pressure to ageable caches. |
| * |
| * 'shrink' is passed a count 'nr_to_scan' and a 'gfpmask'. It should |
| * look through the least-recently-used 'nr_to_scan' entries and |
| * attempt to free them up. It should return the number of objects |
| * which remain in the cache. If it returns -1, it means it cannot do |
| * any scanning at this time (eg. there is a risk of deadlock). |
| * |
| * The 'gfpmask' refers to the allocation we are currently trying to |
| * fulfil. |
| * |
| * Note that 'shrink' will be passed nr_to_scan == 0 when the VM is |
| * querying the cache size, so a fastpath for that case is appropriate. |
| */ |
| struct shrinker { |
| int (*shrink)(int nr_to_scan, gfp_t gfp_mask); |
| int seeks; /* seeks to recreate an obj */ |
| |
| /* These are for internal use */ |
| struct list_head list; |
| long nr; /* objs pending delete */ |
| }; |
| #define DEFAULT_SEEKS 2 /* A good number if you don't know better. */ |
| extern void register_shrinker(struct shrinker *); |
| extern void unregister_shrinker(struct shrinker *); |
| |
| 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); |
| |
| #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, 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, pmd, address) \ |
| ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| NULL: pte_offset_map(pmd, address)) |
| |
| #define pte_alloc_map_lock(mm, pmd, address, ptlp) \ |
| ((unlikely(!pmd_present(*(pmd))) && __pte_alloc(mm, pmd, address))? \ |
| NULL: pte_offset_map_lock(mm, pmd, address, ptlp)) |
| |
| #define pte_alloc_kernel(pmd, address) \ |
| ((unlikely(!pmd_present(*(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); |
| #ifdef CONFIG_ARCH_POPULATES_NODE_MAP |
| /* |
| * With CONFIG_ARCH_POPULATES_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 add_active_range() 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() |
| * add_active_range(node_id, start_pfn, end_pfn) |
| * free_area_init_nodes(max_zone_pfns); |
| * |
| * If the architecture guarantees that there are no holes in the ranges |
| * registered with add_active_range(), free_bootmem_active_regions() |
| * will call 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_ARCH_POPULATES_NODE_MAP |
| */ |
| extern void free_area_init_nodes(unsigned long *max_zone_pfn); |
| extern void add_active_range(unsigned int nid, unsigned long start_pfn, |
| unsigned long end_pfn); |
| extern void remove_active_range(unsigned int nid, unsigned long start_pfn, |
| unsigned long end_pfn); |
| extern void remove_all_active_ranges(void); |
| 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); |
| typedef int (*work_fn_t)(unsigned long, unsigned long, void *); |
| extern void work_with_active_regions(int nid, work_fn_t work_fn, void *data); |
| extern void sparse_memory_present_with_active_regions(int nid); |
| #endif /* CONFIG_ARCH_POPULATES_NODE_MAP */ |
| |
| #if !defined(CONFIG_ARCH_POPULATES_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 void calculate_zone_inactive_ratio(struct zone *zone); |
| extern void mem_init(void); |
| extern void __init mmap_init(void); |
| extern void show_mem(void); |
| extern void si_meminfo(struct sysinfo * val); |
| extern void si_meminfo_node(struct sysinfo *val, int nid); |
| extern int after_bootmem; |
| |
| #ifdef CONFIG_NUMA |
| extern void setup_per_cpu_pageset(void); |
| #else |
| static inline void setup_per_cpu_pageset(void) {} |
| #endif |
| |
| /* nommu.c */ |
| extern atomic_long_t mmap_pages_allocated; |
| |
| /* 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 void 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); |
| |
| #ifdef CONFIG_PROC_FS |
| /* 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); |
| #else |
| static inline void added_exe_file_vma(struct mm_struct *mm) |
| {} |
| |
| static inline void removed_exe_file_vma(struct mm_struct *mm) |
| {} |
| #endif /* CONFIG_PROC_FS */ |
| |
| 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 do_mmap_pgoff(struct file *file, unsigned long addr, |
| unsigned long len, unsigned long prot, |
| unsigned long flag, unsigned long pgoff); |
| extern unsigned long mmap_region(struct file *file, unsigned long addr, |
| unsigned long len, unsigned long flags, |
| unsigned int vm_flags, unsigned long pgoff); |
| |
| static inline unsigned long do_mmap(struct file *file, unsigned long addr, |
| unsigned long len, unsigned long prot, |
| unsigned long flag, unsigned long offset) |
| { |
| unsigned long ret = -EINVAL; |
| if ((offset + PAGE_ALIGN(len)) < offset) |
| goto out; |
| if (!(offset & ~PAGE_MASK)) |
| ret = do_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT); |
| out: |
| return ret; |
| } |
| |
| extern int do_munmap(struct mm_struct *, unsigned long, size_t); |
| |
| extern unsigned long do_brk(unsigned long, unsigned long); |
| |
| /* filemap.c */ |
| extern unsigned long page_unuse(struct page *); |
| 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); |
| |
| /* Do stack extension */ |
| extern int expand_stack(struct vm_area_struct *vma, unsigned long address); |
| #ifdef CONFIG_IA64 |
| extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); |
| #endif |
| extern int expand_stack_downwards(struct vm_area_struct *vma, |
| unsigned long address); |
| |
| /* 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; |
| } |
| |
| pgprot_t vm_get_page_prot(unsigned long vm_flags); |
| 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_ANON 0x08 /* give ZERO_PAGE if no pgtable */ |
| |
| 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 int debug_pagealloc_enabled; |
| |
| extern void kernel_map_pages(struct page *page, int numpages, int enable); |
| |
| static inline void enable_debug_pagealloc(void) |
| { |
| debug_pagealloc_enabled = 1; |
| } |
| #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) {} |
| static inline void enable_debug_pagealloc(void) |
| { |
| } |
| #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 task_struct *tsk); |
| #ifdef __HAVE_ARCH_GATE_AREA |
| int in_gate_area_no_task(unsigned long addr); |
| int in_gate_area(struct task_struct *task, unsigned long addr); |
| #else |
| int in_gate_area_no_task(unsigned long addr); |
| #define in_gate_area(task, addr) ({(void)task; in_gate_area_no_task(addr);}) |
| #endif /* __HAVE_ARCH_GATE_AREA */ |
| |
| int drop_caches_sysctl_handler(struct ctl_table *, int, struct file *, |
| void __user *, size_t *, loff_t *); |
| unsigned long shrink_slab(unsigned long scanned, gfp_t gfp_mask, |
| 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); |
| |
| 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_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); |
| |
| extern int account_locked_memory(struct mm_struct *mm, struct rlimit *rlim, |
| size_t size); |
| extern void refund_locked_memory(struct mm_struct *mm, size_t size); |
| #endif /* __KERNEL__ */ |
| #endif /* _LINUX_MM_H */ |