Hi Wang, [auto build test WARNING on net-next/master -- if it's inappropriate base, please suggest rules for selecting the more suitable base]
url: https://github.com/0day-ci/linux/commits/Wang-Nan/bpf-Output-error-message-to-logbuf-when-loading/20151026-143920 config: x86_64-randconfig-x019-201543 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): kernel/bpf/syscall.c: In function 'bpf_prog_load_note': >> kernel/bpf/syscall.c:600:2: warning: ignoring return value of >> 'copy_to_user', declared with attribute warn_unused_result [-Wunused-result] copy_to_user(log_ubuf, log_buf, log_size); ^ vim +/copy_to_user +600 kernel/bpf/syscall.c 584 va_list args; 585 586 log_ubuf = (char __user *) (unsigned long) attr->log_buf; 587 log_level = attr->log_level; 588 log_size = sizeof(log_buf); 589 if (attr->log_size < log_size) 590 log_size = attr->log_size; 591 592 if (log_level == 0 || !log_size || !log_ubuf) 593 return; 594 595 va_start(args, fmt); 596 log_len = vscnprintf(log_buf, log_size, fmt, args); 597 va_end(args); 598 599 /* Don't need to care the copying result too much */ > 600 copy_to_user(log_ubuf, log_buf, log_size); 601 } 602 603 /* last field in 'union bpf_attr' used by this command */ 604 #define BPF_PROG_LOAD_LAST_FIELD kern_version 605 606 static int bpf_prog_load(union bpf_attr *attr) 607 { 608 enum bpf_prog_type type = attr->prog_type; --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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