Hi Roman,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/0day-ci/linux/commits/Roman-Gushchin/bpf-cgroup-local-storage/20180706-055938
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: s390-performance_defconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=7.2.0 make.cross ARCH=s390 

All errors (new ones prefixed by >>):

   In file included from kernel//bpf/local_storage.c:2:0:
   include/linux/bpf-cgroup.h: In function 'cgroup_bpf_prog_attach':

quoted

include/linux/bpf-cgroup.h:237:10: error: 'EINVAL' undeclared (first use in this function)

     return -EINVAL;
             ^~~~~~
   include/linux/bpf-cgroup.h:237:10: note: each undeclared identifier is reported only once for each function it appears in
   include/linux/bpf-cgroup.h: In function 'cgroup_bpf_prog_detach':
   include/linux/bpf-cgroup.h:243:10: error: 'EINVAL' undeclared (first use in this function)
     return -EINVAL;
             ^~~~~~
   include/linux/bpf-cgroup.h: In function 'cgroup_bpf_prog_query':
   include/linux/bpf-cgroup.h:249:10: error: 'EINVAL' undeclared (first use in this function)
     return -EINVAL;
             ^~~~~~

vim +/EINVAL +237 include/linux/bpf-cgroup.h

30070984 Daniel Mack 2016-11-23  232  
fdb5c453 Sean Young  2018-06-19  233  static inline int cgroup_bpf_prog_attach(const union bpf_attr *attr,
fdb5c453 Sean Young  2018-06-19  234  					 enum bpf_prog_type ptype,
fdb5c453 Sean Young  2018-06-19  235  					 struct bpf_prog *prog)
fdb5c453 Sean Young  2018-06-19  236  {
fdb5c453 Sean Young  2018-06-19 @237  	return -EINVAL;
fdb5c453 Sean Young  2018-06-19  238  }
fdb5c453 Sean Young  2018-06-19  239  

:::::: The code at line 237 was first introduced by commit
:::::: fdb5c4531c1e0e50e609df83f736b6f3a02896e2 bpf: fix attach type BPF_LIRC_MODE2 dependency wrt CONFIG_CGROUP_BPF

:::::: TO: Sean Young [off-list ref]
:::::: CC: Daniel Borkmann [off-list ref]

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