<snip>

But the issue remain the same:
$ make
make -C /home/lexa/linux M=/home/lexa/module
O=/home/lexa/module/build_x86 modules
make[1]: Entering directory '/home/lexa/linux'
make[2]: Entering directory '/home/lexa/module/build_x86'

  WARNING: Symbol version dump ./Module.symvers
           is missing; modules will have no dependencies and modversions.
<snip>

Please run make modules from the top level directory of your source tree and and then module.symvers will be generated.