Hi Daniel,

[auto build test ERROR on net-next/master]
[also build test ERROR on next-20160906]
[cannot apply to linus/master linux/master v4.8-rc5]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
[Suggest to use git(>=2.9.0) format-patch --base=<commit> (or --base=auto for convenience) to record what (public, well-known) commit your patch series was built on]
[Check https://git-scm.com/docs/git-format-patch for more information]

url:    https://github.com/0day-ci/linux/commits/Daniel-Mack/Add-eBPF-hooks-for-cgroups/20160907-110357
config: xtensa-allmodconfig (attached as .config)
compiler: xtensa-linux-gcc (GCC) 4.9.0
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All errors (new ones prefixed by >>):

   In file included from include/linux/cgroup-defs.h:19:0,
                    from include/linux/sched.h:61,
                    from include/linux/ptrace.h:5,
                    from arch/xtensa/kernel/asm-offsets.c:21:
   include/linux/bpf-cgroup.h: In function 'cgroup_bpf_run_filter':

quoted

include/linux/bpf-cgroup.h:48:2: error: implicit declaration of function 'static_branch_unlikely' [-Werror=implicit-function-declaration]

     if (cgroup_bpf_enabled)
     ^
   cc1: some warnings being treated as errors
   make[2]: *** [arch/xtensa/kernel/asm-offsets.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +/static_branch_unlikely +48 include/linux/bpf-cgroup.h

    42	
    43	/* Wrapper for __cgroup_bpf_run_filter() guarded by cgroup_bpf_enabled */
    44	static inline int cgroup_bpf_run_filter(struct sock *sk,
    45						struct sk_buff *skb,
    46						enum bpf_attach_type type)
    47	{
  > 48		if (cgroup_bpf_enabled)
    49			return __cgroup_bpf_run_filter(sk, skb, type);
    50	
    51		return 0;

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