Hi Tao, kernel test robot noticed the following build warnings: [auto build test WARNING on bpf-next/master] url: https://github.com/intel-lab-lkp/linux/commits/Tao-Chen/bpf-Add-BPF_CALL_FUNC-to-simplify-code/20240920-233936 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master patch link: https://lore.kernel.org/r/20240920153706.919154-1-chen.dylane%40gmail.com patch subject: [PATCH bpf-next 2/2] bpf: Add BPF_CALL_FUNC* to simplify code config: mips-mtx1_defconfig (https://download.01.org/0day-ci/archive/20240923/202409230306.7OGURpiH-lkp@xxxxxxxxx/config) compiler: clang version 16.0.6 (https://github.com/llvm/llvm-project 7cbf1a2591520c2491aa35339f227775f4d3adf6) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240923/202409230306.7OGURpiH-lkp@xxxxxxxxx/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Closes: https://lore.kernel.org/oe-kbuild-all/202409230306.7OGURpiH-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): kernel/bpf/core.c:2010:36: error: called object type 'u8 *' (aka 'unsigned char *') is not a function or function pointer BPF_R0 = BPF_CALL_FUNC(insn->imm)(BPF_R1, BPF_R2, BPF_R3, ~~~~~~~~~~~~~~~~~~~~~~~~^ kernel/bpf/core.c:2015:41: error: called object type 'u8 *' (aka 'unsigned char *') is not a function or function pointer BPF_R0 = BPF_CALL_FUNC_ARGS(insn->imm)(BPF_R1, BPF_R2, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/bpf/core.c:3079: In file included from include/linux/bpf_trace.h:5: In file included from include/trace/events/xdp.h:427: In file included from include/trace/define_trace.h:102: In file included from include/trace/trace_events.h:21: In file included from include/linux/trace_events.h:6: In file included from include/linux/ring_buffer.h:7: >> include/linux/poll.h:136:27: warning: division by zero is undefined [-Wdivision-by-zero] M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) | ^~~~~~~~~ include/linux/poll.h:134:32: note: expanded from macro 'M' #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/poll.h:120:51: note: expanded from macro '__MAP' (from < to ? (v & from) * (to/from) : (v & from) / (from/to)) ^ ~~~~~~~~~ include/linux/poll.h:136:39: warning: division by zero is undefined [-Wdivision-by-zero] M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) | ^~~~~~~~~ include/linux/poll.h:134:32: note: expanded from macro 'M' #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/poll.h:120:51: note: expanded from macro '__MAP' (from < to ? (v & from) * (to/from) : (v & from) / (from/to)) ^ ~~~~~~~~~ 2 warnings and 2 errors generated. vim +136 include/linux/poll.h 7a163b2195cda0 Al Viro 2018-02-01 131 7a163b2195cda0 Al Viro 2018-02-01 132 static inline __poll_t demangle_poll(u16 val) 7a163b2195cda0 Al Viro 2018-02-01 133 { 7a163b2195cda0 Al Viro 2018-02-01 134 #define M(X) (__force __poll_t)__MAP(val, POLL##X, (__force __u16)EPOLL##X) 7a163b2195cda0 Al Viro 2018-02-01 135 return M(IN) | M(OUT) | M(PRI) | M(ERR) | M(NVAL) | 7a163b2195cda0 Al Viro 2018-02-01 @136 M(RDNORM) | M(RDBAND) | M(WRNORM) | M(WRBAND) | 7a163b2195cda0 Al Viro 2018-02-01 137 M(HUP) | M(RDHUP) | M(MSG); 7a163b2195cda0 Al Viro 2018-02-01 138 #undef M 7a163b2195cda0 Al Viro 2018-02-01 139 } 7a163b2195cda0 Al Viro 2018-02-01 140 #undef __MAP 7a163b2195cda0 Al Viro 2018-02-01 141 7a163b2195cda0 Al Viro 2018-02-01 142 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki
