diff -drupN a/fs/ramfs/Makefile b/fs/ramfs/Makefile
--- a/fs/ramfs/Makefile	2018-08-06 17:23:04.000000000 +0300
+++ b/fs/ramfs/Makefile	2022-06-12 05:28:14.000000000 +0300
@@ -4,6 +4,8 @@
 
 obj-y += ramfs.o
 
+ifneq ($(CONFIG_MMU),y)
 file-mmu-y := file-nommu.o
+endif
 file-mmu-$(CONFIG_MMU) := file-mmu.o
 ramfs-objs += inode.o $(file-mmu-y)