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    Subject[PATCH v12 63/69] mm/swapfile: use vma iterator instead of vma linked list
    Date
    From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

    unuse_mm() no longer needs to reference the linked list.

    Link: https://lkml.kernel.org/r/20220504011345.662299-48-Liam.Howlett@oracle.com
    Link: https://lkml.kernel.org/r/20220621204632.3370049-64-Liam.Howlett@oracle.com
    Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
    Acked-by: Vlastimil Babka <vbabka@suse.cz>
    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: Will Deacon <will@kernel.org>
    Cc: Davidlohr Bueso <dave@stgolabs.net>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    ---
    mm/swapfile.c | 4 +++-
    1 file changed, 3 insertions(+), 1 deletion(-)

    diff --git a/mm/swapfile.c b/mm/swapfile.c
    index a2e66d855b19..ec4c1b276691 100644
    --- a/mm/swapfile.c
    +++ b/mm/swapfile.c
    @@ -1991,14 +1991,16 @@ static int unuse_mm(struct mm_struct *mm, unsigned int type)
    {
    struct vm_area_struct *vma;
    int ret = 0;
    + VMA_ITERATOR(vmi, mm, 0);

    mmap_read_lock(mm);
    - for (vma = mm->mmap; vma; vma = vma->vm_next) {
    + for_each_vma(vmi, vma) {
    if (vma->anon_vma) {
    ret = unuse_vma(vma, type);
    if (ret)
    break;
    }
    +
    cond_resched();
    }
    mmap_read_unlock(mm);
    --
    2.35.1
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