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 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _LINUX_MMU_NOTIFIER_H
 #define _LINUX_MMU_NOTIFIER_H
 
 #include <linux/list.h>
 #include <linux/spinlock.h>
 #include <linux/mm_types.h>
 #include <linux/mmap_lock.h>
 #include <linux/srcu.h>
 #include <linux/interval_tree.h>
 
 struct mmu_notifier_subscriptions;
 struct mmu_notifier;
 struct mmu_notifier_range;
 struct mmu_interval_notifier;
 
 /**
  * enum mmu_notifier_event - reason for the mmu notifier callback
  * @MMU_NOTIFY_UNMAP: either munmap() that unmap the range or a mremap() that
  * move the range
  *
  * @MMU_NOTIFY_CLEAR: clear page table entry (many reasons for this like
  * madvise() or replacing a page by another one, ...).
  *
  * @MMU_NOTIFY_PROTECTION_VMA: update is due to protection change for the range
  * ie using the vma access permission (vm_page_prot) to update the whole range
  * is enough no need to inspect changes to the CPU page table (mprotect()
  * syscall)
  *
  * @MMU_NOTIFY_PROTECTION_PAGE: update is due to change in read/write flag for
  * pages in the range so to mirror those changes the user must inspect the CPU
  * page table (from the end callback).
  *
  * @MMU_NOTIFY_SOFT_DIRTY: soft dirty accounting (still same page and same
  * access flags). User should soft dirty the page in the end callback to make
  * sure that anyone relying on soft dirtiness catch pages that might be written
  * through non CPU mappings.
  *
  * @MMU_NOTIFY_RELEASE: used during mmu_interval_notifier invalidate to signal
  * that the mm refcount is zero and the range is no longer accessible.
  *
  * @MMU_NOTIFY_MIGRATE: used during migrate_vma_collect() invalidate to signal
  * a device driver to possibly ignore the invalidation if the
  * owner field matches the driver's device private pgmap owner.
  *
  * @MMU_NOTIFY_EXCLUSIVE: to signal a device driver that the device will no
  * longer have exclusive access to the page. When sent during creation of an
  * exclusive range the owner will be initialised to the value provided by the
  * caller of make_device_exclusive_range(), otherwise the owner will be NULL.
  */
 enum mmu_notifier_event {
     MMU_NOTIFY_UNMAP = 0,
     MMU_NOTIFY_CLEAR,
     MMU_NOTIFY_PROTECTION_VMA,
     MMU_NOTIFY_PROTECTION_PAGE,
     MMU_NOTIFY_SOFT_DIRTY,
     MMU_NOTIFY_RELEASE,
     MMU_NOTIFY_MIGRATE,
     MMU_NOTIFY_EXCLUSIVE,
 };
 
 #define MMU_NOTIFIER_RANGE_BLOCKABLE (1 << 0)
 
 struct mmu_notifier_ops {
     /*
      * Called either by mmu_notifier_unregister or when the mm is
      * being destroyed by exit_mmap, always before all pages are
      * freed. This can run concurrently with other mmu notifier
      * methods (the ones invoked outside the mm context) and it
      * should tear down all secondary mmu mappings and freeze the
      * secondary mmu. If this method isn't implemented you've to
      * be sure that nothing could possibly write to the pages
      * through the secondary mmu by the time the last thread with
      * tsk->mm == mm exits.
      *
      * As side note: the pages freed after ->release returns could
      * be immediately reallocated by the gart at an alias physical
      * address with a different cache model, so if ->release isn't
      * implemented because all _software_ driven memory accesses
      * through the secondary mmu are terminated by the time the
      * last thread of this mm quits, you've also to be sure that
      * speculative _hardware_ operations can't allocate dirty
      * cachelines in the cpu that could not be snooped and made
      * coherent with the other read and write operations happening
      * through the gart alias address, so leading to memory
      * corruption.
      */
     void (*release)(struct mmu_notifier *subscription,
             struct mm_struct *mm);
 
     /*
      * clear_flush_young is called after the VM is
      * test-and-clearing the young/accessed bitflag in the
      * pte. This way the VM will provide proper aging to the
      * accesses to the page through the secondary MMUs and not
      * only to the ones through the Linux pte.
      * Start-end is necessary in case the secondary MMU is mapping the page
      * at a smaller granularity than the primary MMU.
      */
     int (*clear_flush_young)(struct mmu_notifier *subscription,
                  struct mm_struct *mm,
                  unsigned long start,
                  unsigned long end);
 
     /*
      * clear_young is a lightweight version of clear_flush_young. Like the
      * latter, it is supposed to test-and-clear the young/accessed bitflag
      * in the secondary pte, but it may omit flushing the secondary tlb.
      */
     int (*clear_young)(struct mmu_notifier *subscription,
                struct mm_struct *mm,
                unsigned long start,
                unsigned long end);
 
     /*
      * test_young is called to check the young/accessed bitflag in
      * the secondary pte. This is used to know if the page is
      * frequently used without actually clearing the flag or tearing
      * down the secondary mapping on the page.
      */
     int (*test_young)(struct mmu_notifier *subscription,
               struct mm_struct *mm,
               unsigned long address);
 
     /*
      * change_pte is called in cases that pte mapping to page is changed:
      * for example, when ksm remaps pte to point to a new shared page.
      */
     void (*change_pte)(struct mmu_notifier *subscription,
                struct mm_struct *mm,
                unsigned long address,
                pte_t pte);
 
     /*
      * invalidate_range_start() and invalidate_range_end() must be
      * paired and are called only when the mmap_lock and/or the
      * locks protecting the reverse maps are held. If the subsystem
      * can't guarantee that no additional references are taken to
      * the pages in the range, it has to implement the
      * invalidate_range() notifier to remove any references taken
      * after invalidate_range_start().
      *
      * Invalidation of multiple concurrent ranges may be
      * optionally permitted by the driver. Either way the
      * establishment of sptes is forbidden in the range passed to
      * invalidate_range_begin/end for the whole duration of the
      * invalidate_range_begin/end critical section.
      *
      * invalidate_range_start() is called when all pages in the
      * range are still mapped and have at least a refcount of one.
      *
      * invalidate_range_end() is called when all pages in the
      * range have been unmapped and the pages have been freed by
      * the VM.
      *
      * The VM will remove the page table entries and potentially
      * the page between invalidate_range_start() and
      * invalidate_range_end(). If the page must not be freed
      * because of pending I/O or other circumstances then the
      * invalidate_range_start() callback (or the initial mapping
      * by the driver) must make sure that the refcount is kept
      * elevated.
      *
      * If the driver increases the refcount when the pages are
      * initially mapped into an address space then either
      * invalidate_range_start() or invalidate_range_end() may
      * decrease the refcount. If the refcount is decreased on
      * invalidate_range_start() then the VM can free pages as page
      * table entries are removed.  If the refcount is only
      * dropped on invalidate_range_end() then the driver itself
      * will drop the last refcount but it must take care to flush
      * any secondary tlb before doing the final free on the
      * page. Pages will no longer be referenced by the linux
      * address space but may still be referenced by sptes until
      * the last refcount is dropped.
      *
      * If blockable argument is set to false then the callback cannot
      * sleep and has to return with -EAGAIN if sleeping would be required.
      * 0 should be returned otherwise. Please note that notifiers that can
      * fail invalidate_range_start are not allowed to implement
      * invalidate_range_end, as there is no mechanism for informing the
      * notifier that its start failed.
      */
     int (*invalidate_range_start)(struct mmu_notifier *subscription,
                       const struct mmu_notifier_range *range);
     void (*invalidate_range_end)(struct mmu_notifier *subscription,
                      const struct mmu_notifier_range *range);
 
     /*
      * invalidate_range() is either called between
      * invalidate_range_start() and invalidate_range_end() when the
      * VM has to free pages that where unmapped, but before the
      * pages are actually freed, or outside of _start()/_end() when
      * a (remote) TLB is necessary.
      *
      * If invalidate_range() is used to manage a non-CPU TLB with
      * shared page-tables, it not necessary to implement the
      * invalidate_range_start()/end() notifiers, as
      * invalidate_range() already catches the points in time when an
      * external TLB range needs to be flushed. For more in depth
      * discussion on this see Documentation/mm/mmu_notifier.rst
      *
      * Note that this function might be called with just a sub-range
      * of what was passed to invalidate_range_start()/end(), if
      * called between those functions.
      */
     void (*invalidate_range)(struct mmu_notifier *subscription,
                  struct mm_struct *mm,
                  unsigned long start,
                  unsigned long end);
 
     /*
      * These callbacks are used with the get/put interface to manage the
      * lifetime of the mmu_notifier memory. alloc_notifier() returns a new
      * notifier for use with the mm.
      *
      * free_notifier() is only called after the mmu_notifier has been
      * fully put, calls to any ops callback are prevented and no ops
      * callbacks are currently running. It is called from a SRCU callback
      * and cannot sleep.
      */
     struct mmu_notifier *(*alloc_notifier)(struct mm_struct *mm);
     void (*free_notifier)(struct mmu_notifier *subscription);
 };
 
 /*
  * The notifier chains are protected by mmap_lock and/or the reverse map
  * semaphores. Notifier chains are only changed when all reverse maps and
  * the mmap_lock locks are taken.
  *
  * Therefore notifier chains can only be traversed when either
  *
  * 1. mmap_lock is held.
  * 2. One of the reverse map locks is held (i_mmap_rwsem or anon_vma->rwsem).
  * 3. No other concurrent thread can access the list (release)
  */
 struct mmu_notifier {
     struct hlist_node hlist;
     const struct mmu_notifier_ops *ops;
     struct mm_struct *mm;
     struct rcu_head rcu;
     unsigned int users;
 };
 
 /**
  * struct mmu_interval_notifier_ops
  * @invalidate: Upon return the caller must stop using any SPTEs within this
  *              range. This function can sleep. Return false only if sleeping
  *              was required but mmu_notifier_range_blockable(range) is false.
  */
 struct mmu_interval_notifier_ops {
     bool (*invalidate)(struct mmu_interval_notifier *interval_sub,
                const struct mmu_notifier_range *range,
                unsigned long cur_seq);
 };
 
 struct mmu_interval_notifier {
     struct interval_tree_node interval_tree;
     const struct mmu_interval_notifier_ops *ops;
     struct mm_struct *mm;
     struct hlist_node deferred_item;
     unsigned long invalidate_seq;
 };
 
 #ifdef CONFIG_MMU_NOTIFIER
 
 #ifdef CONFIG_LOCKDEP
 extern struct lockdep_map __mmu_notifier_invalidate_range_start_map;
 #endif
 
 struct mmu_notifier_range {
     struct vm_area_struct *vma;
     struct mm_struct *mm;
     unsigned long start;
     unsigned long end;
     unsigned flags;
     enum mmu_notifier_event event;
     void *owner;
 };
 
 static inline int mm_has_notifiers(struct mm_struct *mm)
 {
     return unlikely(mm->notifier_subscriptions);
 }
 
 struct mmu_notifier *mmu_notifier_get_locked(const struct mmu_notifier_ops *ops,
                          struct mm_struct *mm);
 static inline struct mmu_notifier *
 mmu_notifier_get(const struct mmu_notifier_ops *ops, struct mm_struct *mm)
 {
     struct mmu_notifier *ret;
 
     mmap_write_lock(mm);
     ret = mmu_notifier_get_locked(ops, mm);
     mmap_write_unlock(mm);
     return ret;
 }
 void mmu_notifier_put(struct mmu_notifier *subscription);
 void mmu_notifier_synchronize(void);
 
 extern int mmu_notifier_register(struct mmu_notifier *subscription,
                  struct mm_struct *mm);
 extern int __mmu_notifier_register(struct mmu_notifier *subscription,
                    struct mm_struct *mm);
 extern void mmu_notifier_unregister(struct mmu_notifier *subscription,
                     struct mm_struct *mm);
 
 unsigned long
 mmu_interval_read_begin(struct mmu_interval_notifier *interval_sub);
 int mmu_interval_notifier_insert(struct mmu_interval_notifier *interval_sub,
                  struct mm_struct *mm, unsigned long start,
                  unsigned long length,
                  const struct mmu_interval_notifier_ops *ops);
 int mmu_interval_notifier_insert_locked(
     struct mmu_interval_notifier *interval_sub, struct mm_struct *mm,
     unsigned long start, unsigned long length,
     const struct mmu_interval_notifier_ops *ops);
 void mmu_interval_notifier_remove(struct mmu_interval_notifier *interval_sub);
 
 /**
  * mmu_interval_set_seq - Save the invalidation sequence
  * @interval_sub - The subscription passed to invalidate
  * @cur_seq - The cur_seq passed to the invalidate() callback
  *
  * This must be called unconditionally from the invalidate callback of a
  * struct mmu_interval_notifier_ops under the same lock that is used to call
  * mmu_interval_read_retry(). It updates the sequence number for later use by
  * mmu_interval_read_retry(). The provided cur_seq will always be odd.
  *
  * If the caller does not call mmu_interval_read_begin() or
  * mmu_interval_read_retry() then this call is not required.
  */
 static inline void
 mmu_interval_set_seq(struct mmu_interval_notifier *interval_sub,
              unsigned long cur_seq)
 {
     WRITE_ONCE(interval_sub->invalidate_seq, cur_seq);
 }
 
 /**
  * mmu_interval_read_retry - End a read side critical section against a VA range
  * interval_sub: The subscription
  * seq: The return of the paired mmu_interval_read_begin()
  *
  * This MUST be called under a user provided lock that is also held
  * unconditionally by op->invalidate() when it calls mmu_interval_set_seq().
  *
  * Each call should be paired with a single mmu_interval_read_begin() and
  * should be used to conclude the read side.
  *
  * Returns true if an invalidation collided with this critical section, and
  * the caller should retry.
  */
 static inline bool
 mmu_interval_read_retry(struct mmu_interval_notifier *interval_sub,
             unsigned long seq)
 {
     return interval_sub->invalidate_seq != seq;
 }
 
 /**
  * mmu_interval_check_retry - Test if a collision has occurred
  * interval_sub: The subscription
  * seq: The return of the matching mmu_interval_read_begin()
  *
  * This can be used in the critical section between mmu_interval_read_begin()
  * and mmu_interval_read_retry().  A return of true indicates an invalidation
  * has collided with this critical region and a future
  * mmu_interval_read_retry() will return true.
  *
  * False is not reliable and only suggests a collision may not have
  * occurred. It can be called many times and does not have to hold the user
  * provided lock.
  *
  * This call can be used as part of loops and other expensive operations to
  * expedite a retry.
  */
 static inline bool
 mmu_interval_check_retry(struct mmu_interval_notifier *interval_sub,
              unsigned long seq)
 {
     /* Pairs with the WRITE_ONCE in mmu_interval_set_seq() */
     return READ_ONCE(interval_sub->invalidate_seq) != seq;
 }
 
 extern void __mmu_notifier_subscriptions_destroy(struct mm_struct *mm);
 extern void __mmu_notifier_release(struct mm_struct *mm);
 extern int __mmu_notifier_clear_flush_young(struct mm_struct *mm,
                       unsigned long start,
                       unsigned long end);
 extern int __mmu_notifier_clear_young(struct mm_struct *mm,
                       unsigned long start,
                       unsigned long end);
 extern int __mmu_notifier_test_young(struct mm_struct *mm,
                      unsigned long address);
 extern void __mmu_notifier_change_pte(struct mm_struct *mm,
                       unsigned long address, pte_t pte);
 extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r);
 extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r,
                   bool only_end);
 extern void __mmu_notifier_invalidate_range(struct mm_struct *mm,
                   unsigned long start, unsigned long end);
 extern bool
 mmu_notifier_range_update_to_read_only(const struct mmu_notifier_range *range);
 
 static inline bool
 mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
 {
     return (range->flags & MMU_NOTIFIER_RANGE_BLOCKABLE);
 }
 
 static inline void mmu_notifier_release(struct mm_struct *mm)
 {
     if (mm_has_notifiers(mm))
         __mmu_notifier_release(mm);
 }
 
 static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
                       unsigned long start,
                       unsigned long end)
 {
     if (mm_has_notifiers(mm))
         return __mmu_notifier_clear_flush_young(mm, start, end);
     return 0;
 }
 
 static inline int mmu_notifier_clear_young(struct mm_struct *mm,
                        unsigned long start,
                        unsigned long end)
 {
     if (mm_has_notifiers(mm))
         return __mmu_notifier_clear_young(mm, start, end);
     return 0;
 }
 
 static inline int mmu_notifier_test_young(struct mm_struct *mm,
                       unsigned long address)
 {
     if (mm_has_notifiers(mm))
         return __mmu_notifier_test_young(mm, address);
     return 0;
 }
 
 static inline void mmu_notifier_change_pte(struct mm_struct *mm,
                        unsigned long address, pte_t pte)
 {
     if (mm_has_notifiers(mm))
         __mmu_notifier_change_pte(mm, address, pte);
 }
 
 static inline void
 mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
 {
     might_sleep();
 
     lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
     if (mm_has_notifiers(range->mm)) {
         range->flags |= MMU_NOTIFIER_RANGE_BLOCKABLE;
         __mmu_notifier_invalidate_range_start(range);
     }
     lock_map_release(&__mmu_notifier_invalidate_range_start_map);
 }
 
 static inline int
 mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
 {
     int ret = 0;
 
     lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
     if (mm_has_notifiers(range->mm)) {
         range->flags &= ~MMU_NOTIFIER_RANGE_BLOCKABLE;
         ret = __mmu_notifier_invalidate_range_start(range);
     }
     lock_map_release(&__mmu_notifier_invalidate_range_start_map);
     return ret;
 }
 
 static inline void
 mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)
 {
     if (mmu_notifier_range_blockable(range))
         might_sleep();
 
     if (mm_has_notifiers(range->mm))
         __mmu_notifier_invalidate_range_end(range, false);
 }
 
 static inline void
 mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range)
 {
     if (mm_has_notifiers(range->mm))
         __mmu_notifier_invalidate_range_end(range, true);
 }
 
 static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
                   unsigned long start, unsigned long end)
 {
     if (mm_has_notifiers(mm))
         __mmu_notifier_invalidate_range(mm, start, end);
 }
 
 static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm)
 {
     mm->notifier_subscriptions = NULL;
 }
 
 static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm)
 {
     if (mm_has_notifiers(mm))
         __mmu_notifier_subscriptions_destroy(mm);
 }
 
 
 static inline void mmu_notifier_range_init(struct mmu_notifier_range *range,
                        enum mmu_notifier_event event,
                        unsigned flags,
                        struct vm_area_struct *vma,
                        struct mm_struct *mm,
                        unsigned long start,
                        unsigned long end)
 {
     range->vma = vma;
     range->event = event;
     range->mm = mm;
     range->start = start;
     range->end = end;
     range->flags = flags;
 }
 
 static inline void mmu_notifier_range_init_owner(
             struct mmu_notifier_range *range,
             enum mmu_notifier_event event, unsigned int flags,
             struct vm_area_struct *vma, struct mm_struct *mm,
             unsigned long start, unsigned long end, void *owner)
 {
     mmu_notifier_range_init(range, event, flags, vma, mm, start, end);
     range->owner = owner;
 }
 
 #define ptep_clear_flush_young_notify(__vma, __address, __ptep)     \
 ({                                  \
     int __young;                            \
     struct vm_area_struct *___vma = __vma;              \
     unsigned long ___address = __address;               \
     __young = ptep_clear_flush_young(___vma, ___address, __ptep);   \
     __young |= mmu_notifier_clear_flush_young(___vma->vm_mm,    \
                           ___address,       \
                           ___address +      \
                             PAGE_SIZE); \
     __young;                            \
 })
 
 #define pmdp_clear_flush_young_notify(__vma, __address, __pmdp)     \
 ({                                  \
     int __young;                            \
     struct vm_area_struct *___vma = __vma;              \
     unsigned long ___address = __address;               \
     __young = pmdp_clear_flush_young(___vma, ___address, __pmdp);   \
     __young |= mmu_notifier_clear_flush_young(___vma->vm_mm,    \
                           ___address,       \
                           ___address +      \
                             PMD_SIZE);  \
     __young;                            \
 })
 
 #define ptep_clear_young_notify(__vma, __address, __ptep)       \
 ({                                  \
     int __young;                            \
     struct vm_area_struct *___vma = __vma;              \
     unsigned long ___address = __address;               \
     __young = ptep_test_and_clear_young(___vma, ___address, __ptep);\
     __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address,  \
                         ___address + PAGE_SIZE);    \
     __young;                            \
 })
 
 #define pmdp_clear_young_notify(__vma, __address, __pmdp)       \
 ({                                  \
     int __young;                            \
     struct vm_area_struct *___vma = __vma;              \
     unsigned long ___address = __address;               \
     __young = pmdp_test_and_clear_young(___vma, ___address, __pmdp);\
     __young |= mmu_notifier_clear_young(___vma->vm_mm, ___address,  \
                         ___address + PMD_SIZE); \
     __young;                            \
 })
 
 #define ptep_clear_flush_notify(__vma, __address, __ptep)       \
 ({                                  \
     unsigned long ___addr = __address & PAGE_MASK;          \
     struct mm_struct *___mm = (__vma)->vm_mm;           \
     pte_t ___pte;                           \
                                     \
     ___pte = ptep_clear_flush(__vma, __address, __ptep);        \
     mmu_notifier_invalidate_range(___mm, ___addr,           \
                     ___addr + PAGE_SIZE);       \
                                     \
     ___pte;                             \
 })
 
 #define pmdp_huge_clear_flush_notify(__vma, __haddr, __pmd)     \
 ({                                  \
     unsigned long ___haddr = __haddr & HPAGE_PMD_MASK;      \
     struct mm_struct *___mm = (__vma)->vm_mm;           \
     pmd_t ___pmd;                           \
                                     \
     ___pmd = pmdp_huge_clear_flush(__vma, __haddr, __pmd);      \
     mmu_notifier_invalidate_range(___mm, ___haddr,          \
                       ___haddr + HPAGE_PMD_SIZE);   \
                                     \
     ___pmd;                             \
 })
 
 #define pudp_huge_clear_flush_notify(__vma, __haddr, __pud)     \
 ({                                  \
     unsigned long ___haddr = __haddr & HPAGE_PUD_MASK;      \
     struct mm_struct *___mm = (__vma)->vm_mm;           \
     pud_t ___pud;                           \
                                     \
     ___pud = pudp_huge_clear_flush(__vma, __haddr, __pud);      \
     mmu_notifier_invalidate_range(___mm, ___haddr,          \
                       ___haddr + HPAGE_PUD_SIZE);   \
                                     \
     ___pud;                             \
 })
 
 /*
  * set_pte_at_notify() sets the pte _after_ running the notifier.
  * This is safe to start by updating the secondary MMUs, because the primary MMU
  * pte invalidate must have already happened with a ptep_clear_flush() before
  * set_pte_at_notify() has been invoked.  Updating the secondary MMUs first is
  * required when we change both the protection of the mapping from read-only to
  * read-write and the pfn (like during copy on write page faults). Otherwise the
  * old page would remain mapped readonly in the secondary MMUs after the new
  * page is already writable by some CPU through the primary MMU.
  */
 #define set_pte_at_notify(__mm, __address, __ptep, __pte)       \
 ({                                  \
     struct mm_struct *___mm = __mm;                 \
     unsigned long ___address = __address;               \
     pte_t ___pte = __pte;                       \
                                     \
     mmu_notifier_change_pte(___mm, ___address, ___pte);     \
     set_pte_at(___mm, ___address, __ptep, ___pte);          \
 })
 
 #else /* CONFIG_MMU_NOTIFIER */
 
 struct mmu_notifier_range {
     unsigned long start;
     unsigned long end;
 };
 
 static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range,
                         unsigned long start,
                         unsigned long end)
 {
     range->start = start;
     range->end = end;
 }
 
 #define mmu_notifier_range_init(range,event,flags,vma,mm,start,end)  \
     _mmu_notifier_range_init(range, start, end)
 #define mmu_notifier_range_init_owner(range, event, flags, vma, mm, start, \
                     end, owner) \
     _mmu_notifier_range_init(range, start, end)
 
 static inline bool
 mmu_notifier_range_blockable(const struct mmu_notifier_range *range)
 {
     return true;
 }
 
 static inline int mm_has_notifiers(struct mm_struct *mm)
 {
     return 0;
 }
 
 static inline void mmu_notifier_release(struct mm_struct *mm)
 {
 }
 
 static inline int mmu_notifier_clear_flush_young(struct mm_struct *mm,
                       unsigned long start,
                       unsigned long end)
 {
     return 0;
 }
 
 static inline int mmu_notifier_test_young(struct mm_struct *mm,
                       unsigned long address)
 {
     return 0;
 }
 
 static inline void mmu_notifier_change_pte(struct mm_struct *mm,
                        unsigned long address, pte_t pte)
 {
 }
 
 static inline void
 mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range)
 {
 }
 
 static inline int
 mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range)
 {
     return 0;
 }
 
 static inline
 void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range)
 {
 }
 
 static inline void
 mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range)
 {
 }
 
 static inline void mmu_notifier_invalidate_range(struct mm_struct *mm,
                   unsigned long start, unsigned long end)
 {
 }
 
 static inline void mmu_notifier_subscriptions_init(struct mm_struct *mm)
 {
 }
 
 static inline void mmu_notifier_subscriptions_destroy(struct mm_struct *mm)
 {
 }
 
 #define mmu_notifier_range_update_to_read_only(r) false
 
 #define ptep_clear_flush_young_notify ptep_clear_flush_young
 #define pmdp_clear_flush_young_notify pmdp_clear_flush_young
 #define ptep_clear_young_notify ptep_test_and_clear_young
 #define pmdp_clear_young_notify pmdp_test_and_clear_young
 #define ptep_clear_flush_notify ptep_clear_flush
 #define pmdp_huge_clear_flush_notify pmdp_huge_clear_flush
 #define pudp_huge_clear_flush_notify pudp_huge_clear_flush
 #define set_pte_at_notify set_pte_at
 
 static inline void mmu_notifier_synchronize(void)
 {
 }
 
 #endif /* CONFIG_MMU_NOTIFIER */
 
 #endif /* _LINUX_MMU_NOTIFIER_H */

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