kernel/sys: Use maple tree iterators instead of linked list

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

diff --git a/kernel/sys.c b/kernel/sys.c
index a68e266c912dc189289b734017d094cd0f235b46..a5cee14f027a5b26d3b96b30abb08292a9e2cf42 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1877,9 +1877,11 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
        err = -EBUSY;
        if (exe_file) {
                struct vm_area_struct *vma;
+               MA_STATE(mas, &mm->mm_mt, 0, 0);
 
                mmap_read_lock(mm);
-               for (vma = mm->mmap; vma; vma = vma->vm_next) {
+               rcu_read_lock();
+               mas_for_each(&mas, vma, ULONG_MAX) {
                        if (!vma->vm_file)
                                continue;
                        if (path_equal(&vma->vm_file->f_path,
@@ -1887,6 +1889,7 @@ static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
                                goto exit_err;
                }
 
+               rcu_read_unlock();
                mmap_read_unlock(mm);
                fput(exe_file);
        }
@@ -1901,6 +1904,7 @@ exit:
        fdput(exe);
        return err;
 exit_err:
+       rcu_read_unlock();
        mmap_read_unlock(mm);
        fput(exe_file);
        goto exit;