[PATCH 6/7] lkdtm: crash on overwriting protected pmalloc var

[kbuild test robot]

Hi Igor,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc2]
[cannot apply to next-20180223]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Igor-Stoppa/genalloc-track-beginning-of-allocations/20180225-081601
config: x86_64-rhel (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "pmalloc" [drivers/misc/lkdtm.ko] undefined!
>> ERROR: "pmalloc_create_pool" [drivers/misc/lkdtm.ko] undefined!
>> ERROR: "pmalloc_destroy_pool" [drivers/misc/lkdtm.ko] undefined!
>> ERROR: "pmalloc_protect_pool" [drivers/misc/lkdtm.ko] undefined!

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