tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: 72cf0d8c01acc7aa359dae193ac04980479036f2 commit: 85fb22459cd84a3cee1a1d36a32ba119f7b1c5e7 [26/47] cgroup-v1: add disabled controller check in cgroup1_parse_param() config: powerpc64-randconfig-r013-20210216 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout 85fb22459cd84a3cee1a1d36a32ba119f7b1c5e7 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/powerpc/include/asm/io-defs.h:45:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:58:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:543:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/cgroup/cgroup-v1.c:2: In file included from kernel/cgroup/cgroup-internal.h:5: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:9: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:60:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:544:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/cgroup/cgroup-v1.c:2: In file included from kernel/cgroup/cgroup-internal.h:5: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:9: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:62:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:545:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/cgroup/cgroup-v1.c:2: In file included from kernel/cgroup/cgroup-internal.h:5: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:9: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:64:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:546:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from kernel/cgroup/cgroup-v1.c:2: In file included from kernel/cgroup/cgroup-internal.h:5: In file included from include/linux/cgroup.h:26: In file included from include/linux/kernel_stat.h:9: In file included from include/linux/interrupt.h:11: In file included from include/linux/hardirq.h:9: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:605: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:602:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:66:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:547:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ return invalfc(fc, "Disabled controller '%s'", ^ 6 warnings and 1 error generated. vim +/invalfc +927 kernel/cgroup/cgroup-v1.c 906 907 int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param) 908 { 909 struct cgroup_fs_context *ctx = cgroup_fc2context(fc); 910 struct cgroup_subsys *ss; 911 struct fs_parse_result result; 912 int opt, i; 913 914 opt = fs_parse(fc, &cgroup1_fs_parameters, param, &result); 915 if (opt == -ENOPARAM) { 916 if (strcmp(param->key, "source") == 0) { 917 if (fc->source) 918 return invalf(fc, "Multiple sources not supported"); 919 fc->source = param->string; 920 param->string = NULL; 921 return 0; 922 } 923 for_each_subsys(ss, i) { 924 if (strcmp(param->key, ss->legacy_name)) 925 continue; 926 if (!cgroup_ssid_enabled(i) || cgroup1_ssid_disabled(i)) 928 param->key); 929 ctx->subsys_mask |= (1 << i); 930 return 0; 931 } 932 return cg_invalf(fc, "cgroup1: Unknown subsys name '%s'", param->key); 933 } 934 if (opt < 0) 935 return opt; 936 937 switch (opt) { 938 case Opt_none: 939 /* Explicitly have no subsystems */ 940 ctx->none = true; 941 break; 942 case Opt_all: 943 ctx->all_ss = true; 944 break; 945 case Opt_noprefix: 946 ctx->flags |= CGRP_ROOT_NOPREFIX; 947 break; 948 case Opt_clone_children: 949 ctx->cpuset_clone_children = true; 950 break; 951 case Opt_cpuset_v2_mode: 952 ctx->flags |= CGRP_ROOT_CPUSET_V2_MODE; 953 break; 954 case Opt_xattr: 955 ctx->flags |= CGRP_ROOT_XATTR; 956 break; 957 case Opt_release_agent: 958 /* Specifying two release agents is forbidden */ 959 if (ctx->release_agent) 960 return cg_invalf(fc, "cgroup1: release_agent respecified"); 961 ctx->release_agent = param->string; 962 param->string = NULL; 963 break; 964 case Opt_name: 965 /* blocked by boot param? */ 966 if (cgroup_no_v1_named) 967 return -ENOENT; 968 /* Can't specify an empty name */ 969 if (!param->size) 970 return cg_invalf(fc, "cgroup1: Empty name"); 971 if (param->size > MAX_CGROUP_ROOT_NAMELEN - 1) 972 return cg_invalf(fc, "cgroup1: Name too long"); 973 /* Must match [\w.-]+ */ 974 for (i = 0; i < param->size; i++) { 975 char c = param->string[i]; 976 if (isalnum(c)) 977 continue; 978 if ((c == '.') || (c == '-') || (c == '_')) 979 continue; 980 return cg_invalf(fc, "cgroup1: Invalid name"); 981 } 982 /* Specifying two names is forbidden */ 983 if (ctx->name) 984 return cg_invalf(fc, "cgroup1: name respecified"); 985 ctx->name = param->string; 986 param->string = NULL; 987 break; 988 } 989 return 0; 990 } 991 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org