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    Subject[PATCH v12 51/69] mm/gup: use maple tree navigation instead of linked list
    Date
    From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

    Use find_vma_intersection() to locate the VMAs in __mm_populate() instead
    of using find_vma() and the linked list.

    Link: https://lkml.kernel.org/r/20220504011345.662299-36-Liam.Howlett@oracle.com
    Link: https://lkml.kernel.org/r/20220621204632.3370049-52-Liam.Howlett@oracle.com
    Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: David Howells <dhowells@redhat.com>
    Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
    Cc: SeongJae Park <sj@kernel.org>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Cc: Will Deacon <will@kernel.org>
    Cc: Davidlohr Bueso <dave@stgolabs.net>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---
    mm/gup.c | 7 ++++---
    1 file changed, 4 insertions(+), 3 deletions(-)

    diff --git a/mm/gup.c b/mm/gup.c
    index 407a81d5ca03..f0e5d68ea932 100644
    --- a/mm/gup.c
    +++ b/mm/gup.c
    @@ -1641,10 +1641,11 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
    if (!locked) {
    locked = 1;
    mmap_read_lock(mm);
    - vma = find_vma(mm, nstart);
    + vma = find_vma_intersection(mm, nstart, end);
    } else if (nstart >= vma->vm_end)
    - vma = vma->vm_next;
    - if (!vma || vma->vm_start >= end)
    + vma = find_vma_intersection(mm, vma->vm_end, end);
    +
    + if (!vma)
    break;
    /*
    * Set [nstart; nend) to intersection of desired address
    --
    2.35.1
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