Merge tag 'gfs2-for-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux...

[linux.git] / mm / util.c

diff --git a/mm/util.c b/mm/util.c
index 4ddb6e186dd5cff8768ccbc186c85b31f05fe2c0..8c9b7d1e7c499828c429b93853af28e7299edcc1 100644 (file)
--- a/mm/util.c
+++ b/mm/util.c
@@ -311,6 +311,18 @@ int vma_is_stack_for_current(struct vm_area_struct *vma)
        return (vma->vm_start <= KSTK_ESP(t) && vma->vm_end >= KSTK_ESP(t));
 }
 
+/*
+ * Change backing file, only valid to use during initial VMA setup.
+ */
+void vma_set_file(struct vm_area_struct *vma, struct file *file)
+{
+       /* Changing an anonymous vma with this is illegal */
+       get_file(file);
+       swap(vma->vm_file, file);
+       fput(file);
+}
+EXPORT_SYMBOL(vma_set_file);
+
 #ifndef STACK_RND_MASK
 #define STACK_RND_MASK (0x7ff >> (PAGE_SHIFT - 12))     /* 8MB of VA */
 #endif