tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ftrace-with-regs head: 11b2e25aa401d87a34c18d31b6e520dd2cd00706 commit: 11b2e25aa401d87a34c18d31b6e520dd2cd00706 [2/2] module/ftrace: handle patchable-function-entry config: parisc-c3000_defconfig (attached as .config) compiler: hppa-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 11b2e25aa401d87a34c18d31b6e520dd2cd00706 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=parisc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/parisc/kernel/module.c: In function 'module_finalize': if (symindex != -1 && !strcmp(secname, FTRACE_CALLSITE_SECTION)) { ^~~~~~~~~~~~~~~~~~~~~~~ PER_CPU_BASE_SECTION arch/parisc/kernel/module.c:954:42: note: each undeclared identifier is reported only once for each function it appears in vim +954 arch/parisc/kernel/module.c 884 885 register_unwind_table(me, sechdrs); 886 887 /* haven't filled in me->symtab yet, so have to find it 888 * ourselves */ 889 for (i = 1; i < hdr->e_shnum; i++) { 890 if(sechdrs[i].sh_type == SHT_SYMTAB 891 && (sechdrs[i].sh_flags & SHF_ALLOC)) { 892 int strindex = sechdrs[i].sh_link; 893 symindex = i; 894 /* FIXME: AWFUL HACK 895 * The cast is to drop the const from 896 * the sechdrs pointer */ 897 symhdr = (Elf_Shdr *)&sechdrs[i]; 898 strtab = (char *)sechdrs[strindex].sh_addr; 899 break; 900 } 901 } 902 903 pr_debug("module %s: strtab %p, symhdr %p\n", 904 me->name, strtab, symhdr); 905 906 if(me->arch.got_count > MAX_GOTS) { 907 printk(KERN_ERR "%s: Global Offset Table overflow (used %ld, allowed %d)\n", 908 me->name, me->arch.got_count, MAX_GOTS); 909 return -EINVAL; 910 } 911 912 kfree(me->arch.section); 913 me->arch.section = NULL; 914 915 /* no symbol table */ 916 if(symhdr == NULL) 917 return 0; 918 919 oldptr = (void *)symhdr->sh_addr; 920 newptr = oldptr + 1; /* we start counting at 1 */ 921 nsyms = symhdr->sh_size / sizeof(Elf_Sym); 922 pr_debug("OLD num_symtab %lu\n", nsyms); 923 924 for (i = 1; i < nsyms; i++) { 925 oldptr++; /* note, count starts at 1 so preincrement */ 926 if(strncmp(strtab + oldptr->st_name, 927 ".L", 2) == 0) 928 continue; 929 930 if(newptr != oldptr) 931 *newptr++ = *oldptr; 932 else 933 newptr++; 934 935 } 936 nsyms = newptr - (Elf_Sym *)symhdr->sh_addr; 937 pr_debug("NEW num_symtab %lu\n", nsyms); 938 symhdr->sh_size = nsyms * sizeof(Elf_Sym); 939 940 /* find .altinstructions section */ 941 secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 942 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 943 void *aseg = (void *) s->sh_addr; 944 char *secname = secstrings + s->sh_name; 945 946 if (!strcmp(".altinstructions", secname)) 947 /* patch .altinstructions */ 948 apply_alternatives(aseg, aseg + s->sh_size, me->name); 949 950 /* For 32 bit kernels we're compiling modules with 951 * -ffunction-sections so we must relocate the addresses in the 952 * ftrace call site section. 953 */ 955 if (s->sh_type == SHT_REL) 956 err = apply_relocate((Elf_Shdr *)sechdrs, 957 strtab, symindex, 958 s - sechdrs, me); 959 else if (s->sh_type == SHT_RELA) 960 err = apply_relocate_add((Elf_Shdr *)sechdrs, 961 strtab, symindex, 962 s - sechdrs, me); 963 if (err) 964 return err; 965 } 966 } 967 return 0; 968 } 969 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation