[PATCH v3 12/13] mm: delete mmap_write_trylock() and vma_try_start_write()

[Hugh Dickins]

mmap_write_trylock() and vma_try_start_write() were added just for
khugepaged, but now it has no use for them: delete.

Signed-off-by: Hugh Dickins <hu...@google.com>
---
 include/linux/mm.h        | 17 -----------------
 include/linux/mmap_lock.h | 10 ----------
 2 files changed, 27 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 2dd73e4f3d8e..b7b45be616ad 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -692,21 +692,6 @@ static inline void vma_start_write(struct vm_area_struct 
*vma)
        up_write(&vma->vm_lock->lock);
 }
 
-static inline bool vma_try_start_write(struct vm_area_struct *vma)
-{
-       int mm_lock_seq;
-
-       if (__is_vma_write_locked(vma, &mm_lock_seq))
-               return true;
-
-       if (!down_write_trylock(&vma->vm_lock->lock))
-               return false;
-
-       vma->vm_lock_seq = mm_lock_seq;
-       up_write(&vma->vm_lock->lock);
-       return true;
-}
-
 static inline void vma_assert_write_locked(struct vm_area_struct *vma)
 {
        int mm_lock_seq;
@@ -731,8 +716,6 @@ static inline bool vma_start_read(struct vm_area_struct 
*vma)
                { return false; }
 static inline void vma_end_read(struct vm_area_struct *vma) {}
 static inline void vma_start_write(struct vm_area_struct *vma) {}
-static inline bool vma_try_start_write(struct vm_area_struct *vma)
-               { return true; }
 static inline void vma_assert_write_locked(struct vm_area_struct *vma) {}
 static inline void vma_mark_detached(struct vm_area_struct *vma,
                                     bool detached) {}
diff --git a/include/linux/mmap_lock.h b/include/linux/mmap_lock.h
index aab8f1b28d26..d1191f02c7fa 100644
--- a/include/linux/mmap_lock.h
+++ b/include/linux/mmap_lock.h
@@ -112,16 +112,6 @@ static inline int mmap_write_lock_killable(struct 
mm_struct *mm)
        return ret;
 }
 
-static inline bool mmap_write_trylock(struct mm_struct *mm)
-{
-       bool ret;
-
-       __mmap_lock_trace_start_locking(mm, true);
-       ret = down_write_trylock(&mm->mmap_lock) != 0;
-       __mmap_lock_trace_acquire_returned(mm, true, ret);
-       return ret;
-}
-
 static inline void mmap_write_unlock(struct mm_struct *mm)
 {
        __mmap_lock_trace_released(mm, true);
-- 
2.35.3