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-rw-r--r--fs/namespace.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 2019899f2ab..e5aa1eeb574 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1526,6 +1526,10 @@ static void chroot_fs_refs(struct nameidata *old_nd, struct nameidata *new_nd)
* pointed to by put_old must yield the same directory as new_root. No other
* file system may be mounted on put_old. After all, new_root is a mountpoint.
*
+ * Also, the current root cannot be on the 'rootfs' (initial ramfs) filesystem.
+ * See Documentation/filesystems/ramfs-rootfs-initramfs.txt for alternatives
+ * in this situation.
+ *
* Notes:
* - we don't move root/cwd if they are not at the root (reason: if something
* cared enough to change them, it's probably wrong to force them elsewhere)