Hi Matteo, [FYI, it's a private test report for your RFC patch.] [auto build test WARNING on net-next/master] url: https://github.com/0day-ci/linux/commits/Matteo-Croce/page_pool-recycle-b... base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git 34bb975126419e86bc3b95e200dc41de6c6ca69c config: i386-randconfig-s002-20210311 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-262-g5e674421-dirty # https://github.com/0day-ci/linux/commit/0a15a8310c854a5bbec0a0e23000efb3f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Matteo-Croce/page_pool-recycle-buffers/20210312-034745 git checkout 0a15a8310c854a5bbec0a0e23000efb3f377e097 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; "sparse warnings: (new ones prefixed by >>)" vim +377 net/core/xdp.c 374 375 void xdp_return_skb_frame(void *data, struct xdp_mem_info *mem) 376 { 378 } 379 EXPORT_SYMBOL_GPL(xdp_return_skb_frame); 380 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org