mm/swapfile: Use maple tree iterator instead of vma linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>

diff --git a/mm/swapfile.c b/mm/swapfile.c
index 6212bc03360215990b8423b27d220ecd89cd733e..9366eec5787bc0fc82202e04df569a2d8bd8b88a 100644 (file)
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2103,17 +2103,24 @@ static int unuse_mm(struct mm_struct *mm, unsigned int type,
 {
        struct vm_area_struct *vma;
        int ret = 0;
+       MA_STATE(mas, &mm->mm_mt, 0, 0);
 
        mmap_read_lock(mm);
-       for (vma = mm->mmap; vma; vma = vma->vm_next) {
+       mas_lock(&mas);
+       mas_for_each(&mas, vma, ULONG_MAX) {
                if (vma->anon_vma) {
                        ret = unuse_vma(vma, type, frontswap,
                                        fs_pages_to_unuse);
                        if (ret)
                                break;
                }
+
+               mas_unlock(&mas);
+               mas_pause(&mas);
                cond_resched();
+               mas_lock(&mas);
        }
+       mas_unlock(&mas);
        mmap_read_unlock(mm);
        return ret;
 }