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    Subject[PATCH v12 42/69] fs/proc/base: use maple tree iterators in place of linked list
    Date
    From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>

    Link: https://lkml.kernel.org/r/20220504011345.662299-27-Liam.Howlett@oracle.com
    Link: https://lkml.kernel.org/r/20220621204632.3370049-43-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>
    ---
    fs/proc/base.c | 5 ++++-
    1 file changed, 4 insertions(+), 1 deletion(-)

    diff --git a/fs/proc/base.c b/fs/proc/base.c
    index 8dfa36a99c74..617816168748 100644
    --- a/fs/proc/base.c
    +++ b/fs/proc/base.c
    @@ -2322,6 +2322,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
    GENRADIX(struct map_files_info) fa;
    struct map_files_info *p;
    int ret;
    + MA_STATE(mas, NULL, 0, 0);

    genradix_init(&fa);

    @@ -2349,6 +2350,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
    }

    nr_files = 0;
    + mas.tree = &mm->mm_mt;

    /*
    * We need two passes here:
    @@ -2360,7 +2362,8 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
    * routine might require mmap_lock taken in might_fault().
    */

    - for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
    + pos = 2;
    + mas_for_each(&mas, vma, ULONG_MAX) {
    if (!vma->vm_file)
    continue;
    if (++pos <= ctx->pos)
    --
    2.35.1
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