mm/gup: Use maple tree navigation instead of linked list

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

diff --git a/mm/gup.c b/mm/gup.c
index 55686fc8128ee24defefc646d68df0e8bf97ce82..8a69c53429094fa53d79d2231c375b7b466ef638 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -1445,6 +1445,7 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
        struct vm_area_struct *vma = NULL;
        int locked = 0;
        long ret = 0;
+       MA_STATE(mas, &mm->mm_mt, start, start);
 
        end = start + len;
 
@@ -1456,10 +1457,10 @@ 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 = mas_find(&mas, end);
                } else if (nstart >= vma->vm_end)
-                       vma = vma->vm_next;
-               if (!vma || vma->vm_start >= end)
+                       vma = mas_next(&mas, end);
+               if (!vma)
                        break;
                /*
                 * Set [nstart; nend) to intersection of desired address