Hi Toke,

I love your patch! Perhaps something to improve:

[auto build test WARNING on net-next/master]

url:    https://github.com/0day-ci/linux/commits/Toke-H-iland-J-rgensen/xdp-Refactor-devmap-code-in-preparation-for-subsequent-additions/20190301-020259
config: x86_64-randconfig-x016-201908 (attached as .config)
compiler: gcc-8 (Debian 8.2.0-21) 8.2.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/bpf-cgroup.h:5,
                    from include/linux/cgroup-defs.h:22,
                    from include/linux/cgroup.h:28,
                    from include/linux/memcontrol.h:22,
                    from include/linux/swap.h:9,
                    from include/linux/suspend.h:5,
                    from arch/x86/kernel/asm-offsets.c:13:
   include/linux/bpf.h: In function 'dev_map_inc_redirect_count':

quoted

include/linux/bpf.h:724:1: warning: no return statement in function returning non-void [-Wreturn-type]

    }
    ^

vim +724 include/linux/bpf.h

   721	
   722	static inline int dev_map_inc_redirect_count(void)
   723	{
 > 724	}
   725	

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