WARNING: vmlinux.o (__xen_guest): unexpected non-allocatable section.

Did you forget to use "ax"/"aw" in a .S file?
Note that for example <linux/init.h> contains
section definitions for use in .S files.

WARNING: modpost: Found 2 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
  GEN .version
  CHK include/linux/compile.h
  UPD include/linux/compile.h
  CC init/version.o
  LD init/built-in.o
  LD .tmp_vmlinux1
/usr/bin/ld.real: kernel image bigger than KERNEL_IMAGE_SIZE
/usr/bin/ld.real: kernel image bigger than KERNEL_IMAGE_SIZE