[nf-next:master 5/7] ./usr/include/linux/netfilter/nf_osf.h:73: userspace cannot reference function or variable defined in the kernel

kbuild test robot <lkp@xxxxxxxxx> · Tue, 31 Jul 2018 12:21:26 +0800

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next.git master
head:   4ed8eb6570a49931c705512060acd50058d61616
commit: f9324952088f1cd62ea4addf9ff532f1e6452a22 [5/7] netfilter: nfnetlink_osf: extract nfnetlink_subsystem code from xt_osf.c
config: i386-randconfig-a1-07310851 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout f9324952088f1cd62ea4addf9ff532f1e6452a22
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

>> ./usr/include/linux/netfilter/nf_osf.h:73: userspace cannot reference function or variable defined in the kernel

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