tree: https://git.kernel.org/pub/scm/linux/kernel/git/mips/linux.git mips-fixes head: afe3a2ccc9586a001d4745a9d1898adfa630e47b commit: afe3a2ccc9586a001d4745a9d1898adfa630e47b [3/3] MIPS: Use async IPIs for arch_trigger_cpumask_backtrace() config: mips-allyesconfig (attached as .config) compiler: mips-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout afe3a2ccc9586a001d4745a9d1898adfa630e47b # save the attached .config to linux build tree GCC_VERSION=7.2.0 make.cross ARCH=mips All error/warnings (new ones prefixed by >>): In file included from include/asm-generic/percpu.h:7:0, from ./arch/mips/include/generated/asm/percpu.h:1, from include/linux/percpu.h:13, from include/linux/hrtimer.h:22, from include/linux/sched.h:20, from arch/mips/kernel/process.c:13: arch/mips/kernel/process.c: In function 'raise_backtrace': >> include/linux/percpu-defs.h:91:33: error: section attribute cannot be specified for local variables extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ include/linux/percpu-defs.h:92:26: error: section attribute cannot be specified for local variables __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ >> include/linux/percpu-defs.h:92:26: error: declaration of '__pcpu_unique_static_csd' with no linkage follows extern declaration __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ include/linux/percpu-defs.h:91:33: note: previous declaration of '__pcpu_unique_static_csd' was here extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:44: error: section attribute cannot be specified for local variables static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION' extern __PCPU_ATTRS(sec) __typeof__(type) name; \ ^~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:44: error: section attribute cannot be specified for local variables static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION' __typeof__(type) name ^~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:44: error: weak declaration of 'static_csd' must be public static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION' __typeof__(type) name ^~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ >> arch/mips/kernel/process.c:669:44: error: declaration of 'static_csd' with no linkage follows extern declaration static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION' __typeof__(type) name ^~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ arch/mips/kernel/process.c:669:44: note: previous declaration of 'static_csd' was here static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION' extern __PCPU_ATTRS(sec) __typeof__(type) name; \ ^~~~ >> arch/mips/kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ -- In file included from include/asm-generic/percpu.h:7:0, from ./arch/mips/include/generated/asm/percpu.h:1, from include/linux/percpu.h:13, from include/linux/hrtimer.h:22, from include/linux/sched.h:20, from arch/mips//kernel/process.c:13: arch/mips//kernel/process.c: In function 'raise_backtrace': >> include/linux/percpu-defs.h:91:33: error: section attribute cannot be specified for local variables extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ include/linux/percpu-defs.h:92:26: error: section attribute cannot be specified for local variables __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ >> include/linux/percpu-defs.h:92:26: error: declaration of '__pcpu_unique_static_csd' with no linkage follows extern declaration __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ include/linux/percpu-defs.h:91:33: note: previous declaration of '__pcpu_unique_static_csd' was here extern __PCPU_DUMMY_ATTRS char __pcpu_unique_##name; \ ^ >> include/linux/percpu-defs.h:116:2: note: in expansion of macro 'DEFINE_PER_CPU_SECTION' DEFINE_PER_CPU_SECTION(type, name, "") ^~~~~~~~~~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:44: error: section attribute cannot be specified for local variables static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION' extern __PCPU_ATTRS(sec) __typeof__(type) name; \ ^~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:44: error: section attribute cannot be specified for local variables static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION' __typeof__(type) name ^~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:44: error: weak declaration of 'static_csd' must be public static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION' __typeof__(type) name ^~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:44: error: declaration of 'static_csd' with no linkage follows extern declaration static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:95:19: note: in definition of macro 'DEFINE_PER_CPU_SECTION' __typeof__(type) name ^~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ arch/mips//kernel/process.c:669:44: note: previous declaration of 'static_csd' was here static DEFINE_PER_CPU(call_single_data_t, static_csd); ^ include/linux/percpu-defs.h:93:44: note: in definition of macro 'DEFINE_PER_CPU_SECTION' extern __PCPU_ATTRS(sec) __typeof__(type) name; \ ^~~~ arch/mips//kernel/process.c:669:9: note: in expansion of macro 'DEFINE_PER_CPU' static DEFINE_PER_CPU(call_single_data_t, static_csd); ^~~~~~~~~~~~~~ vim +669 arch/mips/kernel/process.c 666 667 static void raise_backtrace(cpumask_t *mask) 668 { > 669 static DEFINE_PER_CPU(call_single_data_t, static_csd); 670 call_single_data_t *csd; 671 int cpu; 672 673 for_each_cpu(cpu, mask) { 674 /* 675 * If we previously sent an IPI to the target CPU & it hasn't 676 * cleared its bit in the busy cpumask then it didn't handle 677 * our previous IPI & it's not safe for us to reuse the 678 * call_single_data_t. 679 */ 680 if (cpumask_test_and_set_cpu(cpu, &backtrace_csd_busy)) { 681 pr_warn("Unable to send backtrace IPI to CPU%u - perhaps it hung?\n", 682 cpu); 683 continue; 684 } 685 686 csd = &per_cpu(static_csd, cpu); 687 csd->func = handle_backtrace; 688 smp_call_function_single_async(cpu, csd); 689 } 690 } 691 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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