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    Subject[PATCH v6 28/71] mm: Convert vma_lookup() to use mtree_load()
    Date
    From: "Matthew Wilcox (Oracle)" <willy@infradead.org>

    Unlike the rbtree, the Maple Tree will return a NULL if there's
    nothing at a particular address.

    Since the previous commit dropped the vmacache, it is now possible to
    consult the tree directly.

    Acked-by: Vlastimil Babka <vbabka@suse.cz>
    Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
    ---
    include/linux/mm.h | 7 +------
    1 file changed, 1 insertion(+), 6 deletions(-)

    diff --git a/include/linux/mm.h b/include/linux/mm.h
    index 72654108380e..c57d23b9564c 100644
    --- a/include/linux/mm.h
    +++ b/include/linux/mm.h
    @@ -2802,12 +2802,7 @@ extern struct vm_area_struct *find_vma_intersection(struct mm_struct *mm,
    static inline
    struct vm_area_struct *vma_lookup(struct mm_struct *mm, unsigned long addr)
    {
    - struct vm_area_struct *vma = find_vma(mm, addr);
    -
    - if (vma && addr < vma->vm_start)
    - vma = NULL;
    -
    - return vma;
    + return mtree_load(&mm->mm_mt, addr);
    }

    static inline unsigned long vm_start_gap(struct vm_area_struct *vma)
    --
    2.34.1
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