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

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

diff --git a/kernel/fork.c b/kernel/fork.c
index 3c14f8aef01ac3097566140bb95b524a75c997f5..d995ab62002b3fcb1a1bf8b490df2e13073be99a 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1229,14 +1229,19 @@ int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
        /* Forbid mm->exe_file change if old file still mapped. */
        old_exe_file = get_mm_exe_file(mm);
        if (old_exe_file) {
+               MA_STATE(mas, &mm->mm_mt, 0, 0);
                mmap_read_lock(mm);
-               for (vma = mm->mmap; vma && !ret; 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,
-                                      &old_exe_file->f_path))
+                                      &old_exe_file->f_path)) {
                                ret = -EBUSY;
+                               break;
+                       }
                }
+               rcu_read_unlock();
                mmap_read_unlock(mm);
                fput(old_exe_file);
                if (ret)