Hi Andrii, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] [also build test WARNING on next-20200519] [cannot apply to bpf/master rcu/dev v5.7-rc6] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Andrii-Nakryiko/BPF-ring-buffer/20200518-040019 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: arm-randconfig-r006-20200519 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>, old ones prefixed by <<): >> kernel/bpf/ringbuf.c:133:14: warning: result of comparison of constant 68719464448 with expression of type 'size_t' (aka 'unsigned int') is always false [-Wtautological-constant-out-of-range-compare] if (data_sz > RINGBUF_MAX_DATA_SZ) ~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~ 1 warning generated. vim +133 kernel/bpf/ringbuf.c 125 126 static struct bpf_ringbuf *bpf_ringbuf_alloc(size_t data_sz, int numa_node) 127 { 128 struct bpf_ringbuf *rb; 129 130 if (!data_sz || !PAGE_ALIGNED(data_sz)) 131 return ERR_PTR(-EINVAL); 132 > 133 if (data_sz > RINGBUF_MAX_DATA_SZ) 134 return ERR_PTR(-E2BIG); 135 136 rb = bpf_ringbuf_area_alloc(data_sz, numa_node); 137 if (!rb) 138 return ERR_PTR(-ENOMEM); 139 140 spin_lock_init(&rb->spinlock); 141 init_waitqueue_head(&rb->waitq); 142 init_irq_work(&rb->work, bpf_ringbuf_notify); 143 144 rb->mask = data_sz - 1; 145 rb->consumer_pos = 0; 146 rb->producer_pos = 0; 147 148 return rb; 149 } 150 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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