scripts/kconfig/conf  --syncconfig Kconfig
  DESCEND  objtool
  CALL    scripts/atomic/check-atomics.sh
  CALL    scripts/checksyscalls.sh
  CHK     include/generated/compile.h
  GZIP    kernel/config_data.gz
  CC      kernel/configs.o
  AR      kernel/built-in.a
  GEN     .version
  LD      vmlinux.o
  MODPOST vmlinux.o
  MODINFO modules.builtin.modinfo
  GEN     modules.builtin
  LD      .tmp_vmlinux1
arch/x86/platform/efi/efi_64.o: In function `efi_thunk_set_virtual_address_map':
/syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:560: undefined reference to `__efi64_thunk'
arch/x86/platform/efi/efi_64.o: In function `efi_set_virtual_address_map':
/syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:902: undefined reference to `efi_uv1_memmap_phys_prolog'
/syzkaller/managers/upstream-linux-next-kasan-gce-root/kernel/arch/x86/platform/efi/efi_64.c:921: undefined reference to `efi_uv1_memmap_phys_epilog'
Makefile:1078: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1