-next build failure with gcc 5.2.1

[Sachin Sant]

next tree fails to build on a ppc64le box with following message

  LD      init/built-in.o
  LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: modpost: Found 3 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
  KSYM    .tmp_kallsyms1.o
kallsyms failure: relative symbol value 0xc000000000000000 out of range in relative mode
Makefile:969: recipe for target 'vmlinux' failed
make: *** [vmlinux] Error 1

GCC version is : gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2) 

Have attached kernel config file.

Thanks
-Sachin

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