-no-pie is not a useful option here, because it's passed to the _linker_ only.
i got it to build with this minimal patch:
--- a/Makefile
+++ b/Makefile
@@ -400,5 +400,5 @@ KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes
-Wno-trigraphs \
-Werror-implicit-function-declaration \
-Wno-format-security \
- -std=gnu89
+ -std=gnu89 -fno-PIE
KBUILD_AFLAGS_KERNEL :=
