1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_MM_TYPES_H
3 #define _LINUX_MM_TYPES_H
5 #include <linux/mm_types_task.h>
7 #include <linux/auxvec.h>
8 #include <linux/list.h>
9 #include <linux/spinlock.h>
10 #include <linux/rbtree.h>
11 #include <linux/rwsem.h>
12 #include <linux/completion.h>
13 #include <linux/cpumask.h>
14 #include <linux/uprobes.h>
15 #include <linux/page-flags-layout.h>
16 #include <linux/workqueue.h>
17 #include <linux/seqlock.h>
21 #ifndef AT_VECTOR_SIZE_ARCH
22 #define AT_VECTOR_SIZE_ARCH 0
24 #define AT_VECTOR_SIZE (2*(AT_VECTOR_SIZE_ARCH + AT_VECTOR_SIZE_BASE + 1))
32 * Each physical page in the system has a struct page associated with
33 * it to keep track of whatever it is we are using the page for at the
34 * moment. Note that we have no way to track which tasks are using
35 * a page, though if it is a pagecache page, rmap structures can tell us
38 * If you allocate the page using alloc_pages(), you can use some of the
39 * space in struct page for your own purposes. The five words in the main
40 * union are available, except for bit 0 of the first word which must be
41 * kept clear. Many users use this word to store a pointer to an object
42 * which is guaranteed to be aligned. If you use the same storage as
43 * page->mapping, you must restore it to NULL before freeing the page.
45 * If your page will not be mapped to userspace, you can also use the four
46 * bytes in the mapcount union, but you must call page_mapcount_reset()
49 * If you want to use the refcount field, it must be used in such a way
50 * that other CPUs temporarily incrementing and then decrementing the
51 * refcount does not cause problems. On receiving the page from
52 * alloc_pages(), the refcount will be positive.
54 * If you allocate pages of order > 0, you can use some of the fields
55 * in each subpage, but you may need to restore some of their values
58 * SLUB uses cmpxchg_double() to atomically update its freelist and
59 * counters. That requires that freelist & counters be adjacent and
60 * double-word aligned. We align all struct pages to double-word
61 * boundaries, and ensure that 'freelist' is aligned within the
64 #ifdef CONFIG_HAVE_ALIGNED_STRUCT_PAGE
65 #define _struct_page_alignment __aligned(2 * sizeof(unsigned long))
67 #define _struct_page_alignment
71 unsigned long flags
; /* Atomic flags, some possibly
72 * updated asynchronously */
74 * Five words (20/40 bytes) are available in this union.
75 * WARNING: bit 0 of the first word is used for PageTail(). That
76 * means the other users of this union MUST NOT use the bit to
77 * avoid collision and false-positive PageTail().
80 struct { /* Page cache and anonymous pages */
82 * @lru: Pageout list, eg. active_list protected by
83 * lruvec->lru_lock. Sometimes used as a generic list
87 /* See page-flags.h for PAGE_MAPPING_FLAGS */
88 struct address_space
*mapping
;
89 pgoff_t index
; /* Our offset within mapping. */
91 * @private: Mapping-private opaque data.
92 * Usually used for buffer_heads if PagePrivate.
93 * Used for swp_entry_t if PageSwapCache.
94 * Indicates order in the buddy system if PageBuddy.
96 unsigned long private;
98 struct { /* page_pool used by netstack */
100 * @dma_addr: might require a 64-bit value on
101 * 32-bit architectures.
103 unsigned long dma_addr
[2];
105 struct { /* slab, slob and slub */
107 struct list_head slab_list
;
108 struct { /* Partial pages */
111 int pages
; /* Nr of pages left */
112 int pobjects
; /* Approximate count */
119 struct kmem_cache
*slab_cache
; /* not slob */
120 /* Double-word boundary */
121 void *freelist
; /* first free object */
123 void *s_mem
; /* slab: first object */
124 unsigned long counters
; /* SLUB */
132 struct { /* Tail pages of compound page */
133 unsigned long compound_head
; /* Bit zero is set */
135 /* First tail page only */
136 unsigned char compound_dtor
;
137 unsigned char compound_order
;
138 atomic_t compound_mapcount
;
139 unsigned int compound_nr
; /* 1 << compound_order */
141 struct { /* Second tail page of compound page */
142 unsigned long _compound_pad_1
; /* compound_head */
143 atomic_t hpage_pinned_refcount
;
144 /* For both global and memcg */
145 struct list_head deferred_list
;
147 struct { /* Page table pages */
148 unsigned long _pt_pad_1
; /* compound_head */
149 pgtable_t pmd_huge_pte
; /* protected by page->ptl */
150 unsigned long _pt_pad_2
; /* mapping */
152 struct mm_struct
*pt_mm
; /* x86 pgds only */
153 atomic_t pt_frag_refcount
; /* powerpc */
155 #if ALLOC_SPLIT_PTLOCKS
161 struct { /* ZONE_DEVICE pages */
162 /** @pgmap: Points to the hosting device page map. */
163 struct dev_pagemap
*pgmap
;
164 void *zone_device_data
;
166 * ZONE_DEVICE private pages are counted as being
167 * mapped so the next 3 words hold the mapping, index,
168 * and private fields from the source anonymous or
169 * page cache page while the page is migrated to device
171 * ZONE_DEVICE MEMORY_DEVICE_FS_DAX pages also
172 * use the mapping, index, and private fields when
173 * pmem backed DAX files are mapped.
177 /** @rcu_head: You can use this to free a page by RCU. */
178 struct rcu_head rcu_head
;
181 union { /* This union is 4 bytes in size. */
183 * If the page can be mapped to userspace, encodes the number
184 * of times this page is referenced by a page table.
189 * If the page is neither PageSlab nor mappable to userspace,
190 * the value stored here may help determine what this page
191 * is used for. See page-flags.h for a list of page types
192 * which are currently stored here.
194 unsigned int page_type
;
196 unsigned int active
; /* SLAB */
197 int units
; /* SLOB */
200 /* Usage count. *DO NOT USE DIRECTLY*. See page_ref.h */
204 unsigned long memcg_data
;
208 * On machines where all RAM is mapped into kernel address space,
209 * we can simply calculate the virtual address. On machines with
210 * highmem some memory is mapped into kernel virtual memory
211 * dynamically, so we need a place to store that address.
212 * Note that this field could be 16 bits on x86 ... ;)
214 * Architectures with slow multiplication can define
215 * WANT_PAGE_VIRTUAL in asm/page.h
217 #if defined(WANT_PAGE_VIRTUAL)
218 void *virtual; /* Kernel virtual address (NULL if
219 not kmapped, ie. highmem) */
220 #endif /* WANT_PAGE_VIRTUAL */
222 #ifdef LAST_CPUPID_NOT_IN_PAGE_FLAGS
225 } _struct_page_alignment
;
227 static inline atomic_t
*compound_mapcount_ptr(struct page
*page
)
229 return &page
[1].compound_mapcount
;
232 static inline atomic_t
*compound_pincount_ptr(struct page
*page
)
234 return &page
[2].hpage_pinned_refcount
;
238 * Used for sizing the vmemmap region on some architectures
240 #define STRUCT_PAGE_MAX_SHIFT (order_base_2(sizeof(struct page)))
242 #define PAGE_FRAG_CACHE_MAX_SIZE __ALIGN_MASK(32768, ~PAGE_MASK)
243 #define PAGE_FRAG_CACHE_MAX_ORDER get_order(PAGE_FRAG_CACHE_MAX_SIZE)
245 #define page_private(page) ((page)->private)
247 static inline void set_page_private(struct page
*page
, unsigned long private)
249 page
->private = private;
252 struct page_frag_cache
{
254 #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE)
260 /* we maintain a pagecount bias, so that we dont dirty cache line
261 * containing page->_refcount every time we allocate a fragment.
263 unsigned int pagecnt_bias
;
267 typedef unsigned long vm_flags_t
;
270 * A region containing a mapping of a non-memory backed file under NOMMU
271 * conditions. These are held in a global tree and are pinned by the VMAs that
275 struct rb_node vm_rb
; /* link in global region tree */
276 vm_flags_t vm_flags
; /* VMA vm_flags */
277 unsigned long vm_start
; /* start address of region */
278 unsigned long vm_end
; /* region initialised to here */
279 unsigned long vm_top
; /* region allocated to here */
280 unsigned long vm_pgoff
; /* the offset in vm_file corresponding to vm_start */
281 struct file
*vm_file
; /* the backing file or NULL */
283 int vm_usage
; /* region usage count (access under nommu_region_sem) */
284 bool vm_icache_flushed
: 1; /* true if the icache has been flushed for
288 #ifdef CONFIG_USERFAULTFD
289 #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) { NULL, })
290 struct vm_userfaultfd_ctx
{
291 struct userfaultfd_ctx
*ctx
;
293 #else /* CONFIG_USERFAULTFD */
294 #define NULL_VM_UFFD_CTX ((struct vm_userfaultfd_ctx) {})
295 struct vm_userfaultfd_ctx
{};
296 #endif /* CONFIG_USERFAULTFD */
299 * This struct describes a virtual memory area. There is one of these
300 * per VM-area/task. A VM area is any part of the process virtual memory
301 * space that has a special rule for the page-fault handlers (ie a shared
302 * library, the executable area etc).
304 struct vm_area_struct
{
305 /* The first cache line has the info for VMA tree walking. */
307 unsigned long vm_start
; /* Our start address within vm_mm. */
308 unsigned long vm_end
; /* The first byte after our end address
311 /* linked list of VM areas per task, sorted by address */
312 struct vm_area_struct
*vm_next
, *vm_prev
;
314 struct rb_node vm_rb
;
317 * Largest free memory gap in bytes to the left of this VMA.
318 * Either between this VMA and vma->vm_prev, or between one of the
319 * VMAs below us in the VMA rbtree and its ->vm_prev. This helps
320 * get_unmapped_area find a free area of the right size.
322 unsigned long rb_subtree_gap
;
324 /* Second cache line starts here. */
326 struct mm_struct
*vm_mm
; /* The address space we belong to. */
329 * Access permissions of this VMA.
330 * See vmf_insert_mixed_prot() for discussion.
332 pgprot_t vm_page_prot
;
333 unsigned long vm_flags
; /* Flags, see mm.h. */
336 * For areas with an address space and backing store,
337 * linkage into the address_space->i_mmap interval tree.
341 unsigned long rb_subtree_last
;
345 * A file's MAP_PRIVATE vma can be in both i_mmap tree and anon_vma
346 * list, after a COW of one of the file pages. A MAP_SHARED vma
347 * can only be in the i_mmap tree. An anonymous MAP_PRIVATE, stack
348 * or brk vma (with NULL file) can only be in an anon_vma list.
350 struct list_head anon_vma_chain
; /* Serialized by mmap_lock &
352 struct anon_vma
*anon_vma
; /* Serialized by page_table_lock */
354 /* Function pointers to deal with this struct. */
355 const struct vm_operations_struct
*vm_ops
;
357 /* Information about our backing store: */
358 unsigned long vm_pgoff
; /* Offset (within vm_file) in PAGE_SIZE
360 struct file
* vm_file
; /* File we map to (can be NULL). */
361 void * vm_private_data
; /* was vm_pte (shared mem) */
364 atomic_long_t swap_readahead_info
;
367 struct vm_region
*vm_region
; /* NOMMU mapping region */
370 struct mempolicy
*vm_policy
; /* NUMA policy for the VMA */
372 struct vm_userfaultfd_ctx vm_userfaultfd_ctx
;
373 } __randomize_layout
;
376 struct task_struct
*task
;
377 struct core_thread
*next
;
382 struct core_thread dumper
;
383 struct completion startup
;
389 struct vm_area_struct
*mmap
; /* list of VMAs */
390 struct rb_root mm_rb
;
391 u64 vmacache_seqnum
; /* per-thread vmacache */
393 unsigned long (*get_unmapped_area
) (struct file
*filp
,
394 unsigned long addr
, unsigned long len
,
395 unsigned long pgoff
, unsigned long flags
);
397 unsigned long mmap_base
; /* base of mmap area */
398 unsigned long mmap_legacy_base
; /* base of mmap area in bottom-up allocations */
399 #ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES
400 /* Base adresses for compatible mmap() */
401 unsigned long mmap_compat_base
;
402 unsigned long mmap_compat_legacy_base
;
404 unsigned long task_size
; /* size of task vm space */
405 unsigned long highest_vm_end
; /* highest vma end address */
408 #ifdef CONFIG_MEMBARRIER
410 * @membarrier_state: Flags controlling membarrier behavior.
412 * This field is close to @pgd to hopefully fit in the same
413 * cache-line, which needs to be touched by switch_mm().
415 atomic_t membarrier_state
;
419 * @mm_users: The number of users including userspace.
421 * Use mmget()/mmget_not_zero()/mmput() to modify. When this
422 * drops to 0 (i.e. when the task exits and there are no other
423 * temporary reference holders), we also release a reference on
424 * @mm_count (which may then free the &struct mm_struct if
425 * @mm_count also drops to 0).
430 * @mm_count: The number of references to &struct mm_struct
431 * (@mm_users count as 1).
433 * Use mmgrab()/mmdrop() to modify. When this drops to 0, the
434 * &struct mm_struct is freed.
439 * @has_pinned: Whether this mm has pinned any pages. This can
440 * be either replaced in the future by @pinned_vm when it
441 * becomes stable, or grow into a counter on its own. We're
442 * aggresive on this bit now - even if the pinned pages were
443 * unpinned later on, we'll still keep this bit set for the
444 * lifecycle of this mm just for simplicity.
449 atomic_long_t pgtables_bytes
; /* PTE page table pages */
451 int map_count
; /* number of VMAs */
453 spinlock_t page_table_lock
; /* Protects page tables and some
457 * With some kernel config, the current mmap_lock's offset
458 * inside 'mm_struct' is at 0x120, which is very optimal, as
459 * its two hot fields 'count' and 'owner' sit in 2 different
460 * cachelines, and when mmap_lock is highly contended, both
461 * of the 2 fields will be accessed frequently, current layout
462 * will help to reduce cache bouncing.
464 * So please be careful with adding new fields before
465 * mmap_lock, which can easily push the 2 fields into one
468 struct rw_semaphore mmap_lock
;
470 struct list_head mmlist
; /* List of maybe swapped mm's. These
471 * are globally strung together off
472 * init_mm.mmlist, and are protected
477 unsigned long hiwater_rss
; /* High-watermark of RSS usage */
478 unsigned long hiwater_vm
; /* High-water virtual memory usage */
480 unsigned long total_vm
; /* Total pages mapped */
481 unsigned long locked_vm
; /* Pages that have PG_mlocked set */
482 atomic64_t pinned_vm
; /* Refcount permanently increased */
483 unsigned long data_vm
; /* VM_WRITE & ~VM_SHARED & ~VM_STACK */
484 unsigned long exec_vm
; /* VM_EXEC & ~VM_WRITE & ~VM_STACK */
485 unsigned long stack_vm
; /* VM_STACK */
486 unsigned long def_flags
;
489 * @write_protect_seq: Locked when any thread is write
490 * protecting pages mapped by this mm to enforce a later COW,
491 * for instance during page table copying for fork().
493 seqcount_t write_protect_seq
;
495 spinlock_t arg_lock
; /* protect the below fields */
497 unsigned long start_code
, end_code
, start_data
, end_data
;
498 unsigned long start_brk
, brk
, start_stack
;
499 unsigned long arg_start
, arg_end
, env_start
, env_end
;
501 unsigned long saved_auxv
[AT_VECTOR_SIZE
]; /* for /proc/PID/auxv */
504 * Special counters, in some configurations protected by the
505 * page_table_lock, in other configurations by being atomic.
507 struct mm_rss_stat rss_stat
;
509 struct linux_binfmt
*binfmt
;
511 /* Architecture-specific MM context */
512 mm_context_t context
;
514 unsigned long flags
; /* Must use atomic bitops to access */
516 struct core_state
*core_state
; /* coredumping support */
519 spinlock_t ioctx_lock
;
520 struct kioctx_table __rcu
*ioctx_table
;
524 * "owner" points to a task that is regarded as the canonical
525 * user/owner of this mm. All of the following must be true in
526 * order for it to be changed:
528 * current == mm->owner
530 * new_owner->mm == mm
531 * new_owner->alloc_lock is held
533 struct task_struct __rcu
*owner
;
535 struct user_namespace
*user_ns
;
537 /* store ref to file /proc/<pid>/exe symlink points to */
538 struct file __rcu
*exe_file
;
539 #ifdef CONFIG_MMU_NOTIFIER
540 struct mmu_notifier_subscriptions
*notifier_subscriptions
;
542 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && !USE_SPLIT_PMD_PTLOCKS
543 pgtable_t pmd_huge_pte
; /* protected by page_table_lock */
545 #ifdef CONFIG_NUMA_BALANCING
547 * numa_next_scan is the next time that the PTEs will be marked
548 * pte_numa. NUMA hinting faults will gather statistics and
549 * migrate pages to new nodes if necessary.
551 unsigned long numa_next_scan
;
553 /* Restart point for scanning and setting pte_numa */
554 unsigned long numa_scan_offset
;
556 /* numa_scan_seq prevents two threads setting pte_numa */
560 * An operation with batched TLB flushing is going on. Anything
561 * that can move process memory needs to flush the TLB when
562 * moving a PROT_NONE or PROT_NUMA mapped page.
564 atomic_t tlb_flush_pending
;
565 #ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
566 /* See flush_tlb_batched_pending() */
567 bool tlb_flush_batched
;
569 struct uprobes_state uprobes_state
;
570 #ifdef CONFIG_HUGETLB_PAGE
571 atomic_long_t hugetlb_usage
;
573 struct work_struct async_put_work
;
575 #ifdef CONFIG_IOMMU_SUPPORT
578 } __randomize_layout
;
581 * The mm_cpumask needs to be at the end of mm_struct, because it
582 * is dynamically sized based on nr_cpu_ids.
584 unsigned long cpu_bitmap
[];
587 extern struct mm_struct init_mm
;
589 /* Pointer magic because the dynamic array size confuses some compilers. */
590 static inline void mm_init_cpumask(struct mm_struct
*mm
)
592 unsigned long cpu_bitmap
= (unsigned long)mm
;
594 cpu_bitmap
+= offsetof(struct mm_struct
, cpu_bitmap
);
595 cpumask_clear((struct cpumask
*)cpu_bitmap
);
598 /* Future-safe accessor for struct mm_struct's cpu_vm_mask. */
599 static inline cpumask_t
*mm_cpumask(struct mm_struct
*mm
)
601 return (struct cpumask
*)&mm
->cpu_bitmap
;
605 extern void tlb_gather_mmu(struct mmu_gather
*tlb
, struct mm_struct
*mm
);
606 extern void tlb_gather_mmu_fullmm(struct mmu_gather
*tlb
, struct mm_struct
*mm
);
607 extern void tlb_finish_mmu(struct mmu_gather
*tlb
);
609 static inline void init_tlb_flush_pending(struct mm_struct
*mm
)
611 atomic_set(&mm
->tlb_flush_pending
, 0);
614 static inline void inc_tlb_flush_pending(struct mm_struct
*mm
)
616 atomic_inc(&mm
->tlb_flush_pending
);
618 * The only time this value is relevant is when there are indeed pages
619 * to flush. And we'll only flush pages after changing them, which
622 * So the ordering here is:
624 * atomic_inc(&mm->tlb_flush_pending);
631 * mm_tlb_flush_pending();
636 * atomic_dec(&mm->tlb_flush_pending);
638 * Where the increment if constrained by the PTL unlock, it thus
639 * ensures that the increment is visible if the PTE modification is
640 * visible. After all, if there is no PTE modification, nobody cares
641 * about TLB flushes either.
643 * This very much relies on users (mm_tlb_flush_pending() and
644 * mm_tlb_flush_nested()) only caring about _specific_ PTEs (and
645 * therefore specific PTLs), because with SPLIT_PTE_PTLOCKS and RCpc
646 * locks (PPC) the unlock of one doesn't order against the lock of
649 * The decrement is ordered by the flush_tlb_range(), such that
650 * mm_tlb_flush_pending() will not return false unless all flushes have
655 static inline void dec_tlb_flush_pending(struct mm_struct
*mm
)
658 * See inc_tlb_flush_pending().
660 * This cannot be smp_mb__before_atomic() because smp_mb() simply does
661 * not order against TLB invalidate completion, which is what we need.
663 * Therefore we must rely on tlb_flush_*() to guarantee order.
665 atomic_dec(&mm
->tlb_flush_pending
);
668 static inline bool mm_tlb_flush_pending(struct mm_struct
*mm
)
671 * Must be called after having acquired the PTL; orders against that
672 * PTLs release and therefore ensures that if we observe the modified
673 * PTE we must also observe the increment from inc_tlb_flush_pending().
675 * That is, it only guarantees to return true if there is a flush
676 * pending for _this_ PTL.
678 return atomic_read(&mm
->tlb_flush_pending
);
681 static inline bool mm_tlb_flush_nested(struct mm_struct
*mm
)
684 * Similar to mm_tlb_flush_pending(), we must have acquired the PTL
685 * for which there is a TLB flush pending in order to guarantee
686 * we've seen both that PTE modification and the increment.
688 * (no requirement on actually still holding the PTL, that is irrelevant)
690 return atomic_read(&mm
->tlb_flush_pending
) > 1;
696 * typedef vm_fault_t - Return type for page fault handlers.
698 * Page fault handlers return a bitmask of %VM_FAULT values.
700 typedef __bitwise
unsigned int vm_fault_t
;
703 * enum vm_fault_reason - Page fault handlers return a bitmask of
704 * these values to tell the core VM what happened when handling the
705 * fault. Used to decide whether a process gets delivered SIGBUS or
706 * just gets major/minor fault counters bumped up.
708 * @VM_FAULT_OOM: Out Of Memory
709 * @VM_FAULT_SIGBUS: Bad access
710 * @VM_FAULT_MAJOR: Page read from storage
711 * @VM_FAULT_WRITE: Special case for get_user_pages
712 * @VM_FAULT_HWPOISON: Hit poisoned small page
713 * @VM_FAULT_HWPOISON_LARGE: Hit poisoned large page. Index encoded
715 * @VM_FAULT_SIGSEGV: segmentation fault
716 * @VM_FAULT_NOPAGE: ->fault installed the pte, not return page
717 * @VM_FAULT_LOCKED: ->fault locked the returned page
718 * @VM_FAULT_RETRY: ->fault blocked, must retry
719 * @VM_FAULT_FALLBACK: huge page fault failed, fall back to small
720 * @VM_FAULT_DONE_COW: ->fault has fully handled COW
721 * @VM_FAULT_NEEDDSYNC: ->fault did not modify page tables and needs
722 * fsync() to complete (for synchronous page faults
724 * @VM_FAULT_HINDEX_MASK: mask HINDEX value
727 enum vm_fault_reason
{
728 VM_FAULT_OOM
= (__force vm_fault_t
)0x000001,
729 VM_FAULT_SIGBUS
= (__force vm_fault_t
)0x000002,
730 VM_FAULT_MAJOR
= (__force vm_fault_t
)0x000004,
731 VM_FAULT_WRITE
= (__force vm_fault_t
)0x000008,
732 VM_FAULT_HWPOISON
= (__force vm_fault_t
)0x000010,
733 VM_FAULT_HWPOISON_LARGE
= (__force vm_fault_t
)0x000020,
734 VM_FAULT_SIGSEGV
= (__force vm_fault_t
)0x000040,
735 VM_FAULT_NOPAGE
= (__force vm_fault_t
)0x000100,
736 VM_FAULT_LOCKED
= (__force vm_fault_t
)0x000200,
737 VM_FAULT_RETRY
= (__force vm_fault_t
)0x000400,
738 VM_FAULT_FALLBACK
= (__force vm_fault_t
)0x000800,
739 VM_FAULT_DONE_COW
= (__force vm_fault_t
)0x001000,
740 VM_FAULT_NEEDDSYNC
= (__force vm_fault_t
)0x002000,
741 VM_FAULT_HINDEX_MASK
= (__force vm_fault_t
)0x0f0000,
744 /* Encode hstate index for a hwpoisoned large page */
745 #define VM_FAULT_SET_HINDEX(x) ((__force vm_fault_t)((x) << 16))
746 #define VM_FAULT_GET_HINDEX(x) (((__force unsigned int)(x) >> 16) & 0xf)
748 #define VM_FAULT_ERROR (VM_FAULT_OOM | VM_FAULT_SIGBUS | \
749 VM_FAULT_SIGSEGV | VM_FAULT_HWPOISON | \
750 VM_FAULT_HWPOISON_LARGE | VM_FAULT_FALLBACK)
752 #define VM_FAULT_RESULT_TRACE \
753 { VM_FAULT_OOM, "OOM" }, \
754 { VM_FAULT_SIGBUS, "SIGBUS" }, \
755 { VM_FAULT_MAJOR, "MAJOR" }, \
756 { VM_FAULT_WRITE, "WRITE" }, \
757 { VM_FAULT_HWPOISON, "HWPOISON" }, \
758 { VM_FAULT_HWPOISON_LARGE, "HWPOISON_LARGE" }, \
759 { VM_FAULT_SIGSEGV, "SIGSEGV" }, \
760 { VM_FAULT_NOPAGE, "NOPAGE" }, \
761 { VM_FAULT_LOCKED, "LOCKED" }, \
762 { VM_FAULT_RETRY, "RETRY" }, \
763 { VM_FAULT_FALLBACK, "FALLBACK" }, \
764 { VM_FAULT_DONE_COW, "DONE_COW" }, \
765 { VM_FAULT_NEEDDSYNC, "NEEDDSYNC" }
767 struct vm_special_mapping
{
768 const char *name
; /* The name, e.g. "[vdso]". */
771 * If .fault is not provided, this points to a
772 * NULL-terminated array of pages that back the special mapping.
774 * This must not be NULL unless .fault is provided.
779 * If non-NULL, then this is called to resolve page faults
780 * on the special mapping. If used, .pages is not checked.
782 vm_fault_t (*fault
)(const struct vm_special_mapping
*sm
,
783 struct vm_area_struct
*vma
,
784 struct vm_fault
*vmf
);
786 int (*mremap
)(const struct vm_special_mapping
*sm
,
787 struct vm_area_struct
*new_vma
);
790 enum tlb_flush_reason
{
791 TLB_FLUSH_ON_TASK_SWITCH
,
792 TLB_REMOTE_SHOOTDOWN
,
794 TLB_LOCAL_MM_SHOOTDOWN
,
796 NR_TLB_FLUSH_REASONS
,
800 * A swap entry has to fit into a "unsigned long", as the entry is hidden
801 * in the "index" field of the swapper address space.
807 #endif /* _LINUX_MM_TYPES_H */