Hi "Björn,

I love your patch! Yet something to improve:

[auto build test ERROR on 4e99d115d865d45e17e83478d757b58d8fa66d3c]

url:    https://github.com/0day-ci/linux/commits/Bj-rn-T-pel/Introduce-preferred-busy-polling/20210929-234934
base:   4e99d115d865d45e17e83478d757b58d8fa66d3c
config: um-kunit_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/f481c00164924dd5d782a92cc67897cc7f804502
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Bj-rn-T-pel/Introduce-preferred-busy-polling/20210929-234934
        git checkout f481c00164924dd5d782a92cc67897cc7f804502
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=um SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   cc1: warning: arch/um/include/uapi: No such file or directory [-Wmissing-include-dirs]
   In file included from fs/select.c:32:
   include/net/busy_poll.h: In function 'sk_mark_napi_id_once':
>> include/net/busy_poll.h:150:36: error: 'const struct sk_buff' has no member named 'napi_id'
     150 |  __sk_mark_napi_id_once_xdp(sk, skb->napi_id);
         |                                    ^~


vim +150 include/net/busy_poll.h

   145	
   146	/* variant used for unconnected sockets */
   147	static inline void sk_mark_napi_id_once(struct sock *sk,
   148						const struct sk_buff *skb)
   149	{
 > 150		__sk_mark_napi_id_once_xdp(sk, skb->napi_id);
   151	}
   152	

---
0-DAY CI Kernel Test Service, Intel Corporation
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