Hi, [auto build test WARNING on net-next/master]
url: https://github.com/0day-ci/linux/commits/Daniel-Borkmann/BPF-event-output-helper-improvements/20160713-065944 config: s390-allyesconfig (attached as .config) compiler: s390x-linux-gnu-gcc (Debian 5.3.1-8) 5.3.1 20160205 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=s390 All warnings (new ones prefixed by >>): kernel/trace/bpf_trace.c: In function 'bpf_perf_event_output': kernel/trace/bpf_trace.c:284:1: warning: 'bpf_perf_event_output' uses dynamic stack allocation } ^ kernel/trace/bpf_trace.c: In function 'bpf_event_output': >> kernel/trace/bpf_trace.c:319:1: warning: 'bpf_event_output' uses dynamic >> stack allocation } ^ vim +/bpf_event_output +319 kernel/trace/bpf_trace.c 3644f5a9 Daniel Borkmann 2016-07-13 278 if (unlikely(flags & ~(BPF_F_INDEX_MASK))) 3644f5a9 Daniel Borkmann 2016-07-13 279 return -EINVAL; 3644f5a9 Daniel Borkmann 2016-07-13 280 3644f5a9 Daniel Borkmann 2016-07-13 281 return __bpf_perf_event_output((struct pt_regs *)(long) r1, 3644f5a9 Daniel Borkmann 2016-07-13 282 (struct bpf_map *)(long) r2, 3644f5a9 Daniel Borkmann 2016-07-13 283 flags, &raw); 3644f5a9 Daniel Borkmann 2016-07-13 @284 } 3644f5a9 Daniel Borkmann 2016-07-13 285 a43eec30 Alexei Starovoitov 2015-10-20 286 static const struct bpf_func_proto bpf_perf_event_output_proto = { a43eec30 Alexei Starovoitov 2015-10-20 287 .func = bpf_perf_event_output, 1075ef59 Alexei Starovoitov 2015-10-23 288 .gpl_only = true, a43eec30 Alexei Starovoitov 2015-10-20 289 .ret_type = RET_INTEGER, a43eec30 Alexei Starovoitov 2015-10-20 290 .arg1_type = ARG_PTR_TO_CTX, a43eec30 Alexei Starovoitov 2015-10-20 291 .arg2_type = ARG_CONST_MAP_PTR, a43eec30 Alexei Starovoitov 2015-10-20 292 .arg3_type = ARG_ANYTHING, a43eec30 Alexei Starovoitov 2015-10-20 293 .arg4_type = ARG_PTR_TO_STACK, a43eec30 Alexei Starovoitov 2015-10-20 294 .arg5_type = ARG_CONST_STACK_SIZE, a43eec30 Alexei Starovoitov 2015-10-20 295 }; a43eec30 Alexei Starovoitov 2015-10-20 296 bd570ff9 Daniel Borkmann 2016-04-18 297 static DEFINE_PER_CPU(struct pt_regs, bpf_pt_regs); bd570ff9 Daniel Borkmann 2016-04-18 298 f428cc22 Daniel Borkmann 2016-07-13 299 u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 size_meta, f428cc22 Daniel Borkmann 2016-07-13 300 void *ctx, u64 size_ctx, f428cc22 Daniel Borkmann 2016-07-13 301 unsigned long (*ctx_copy_cb)(void *dst, const void *src, f428cc22 Daniel Borkmann 2016-07-13 302 unsigned long n)) bd570ff9 Daniel Borkmann 2016-04-18 303 { bd570ff9 Daniel Borkmann 2016-04-18 304 struct pt_regs *regs = this_cpu_ptr(&bpf_pt_regs); f428cc22 Daniel Borkmann 2016-07-13 305 struct perf_raw_record_frag frag = { f428cc22 Daniel Borkmann 2016-07-13 306 .data = ctx, f428cc22 Daniel Borkmann 2016-07-13 307 .copy_cb = ctx_copy_cb, f428cc22 Daniel Borkmann 2016-07-13 308 }; f428cc22 Daniel Borkmann 2016-07-13 309 struct perf_raw_record raw = { f428cc22 Daniel Borkmann 2016-07-13 310 .size = size_meta + size_ctx, f428cc22 Daniel Borkmann 2016-07-13 311 .size_head = size_meta, f428cc22 Daniel Borkmann 2016-07-13 312 .data = meta, f428cc22 Daniel Borkmann 2016-07-13 313 .frag = size_ctx ? &frag : NULL, f428cc22 Daniel Borkmann 2016-07-13 314 }; bd570ff9 Daniel Borkmann 2016-04-18 315 bd570ff9 Daniel Borkmann 2016-04-18 316 perf_fetch_caller_regs(regs); bd570ff9 Daniel Borkmann 2016-04-18 317 f428cc22 Daniel Borkmann 2016-07-13 318 return __bpf_perf_event_output(regs, map, flags, &raw); bd570ff9 Daniel Borkmann 2016-04-18 @319 } bd570ff9 Daniel Borkmann 2016-04-18 320 606274c5 Alexei Starovoitov 2016-07-06 321 static u64 bpf_get_current_task(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) 606274c5 Alexei Starovoitov 2016-07-06 322 { :::::: The code at line 319 was first introduced by commit :::::: bd570ff970a54df653b48ed0cfb373f2ebed083d bpf: add event output helper for notifications/sampling/logging :::::: TO: Daniel Borkmann <dan...@iogearbox.net> :::::: CC: David S. Miller <da...@davemloft.net> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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