tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y head: eeb2e2f2ab09a74225c0ea2a481c87aef3557245 commit: f579da2a8c318e5fd1bef6ad5c300386eff9fe7d [906/2125] powerpc/64s: flush L1D after user accesses config: powerpc-randconfig-r001-20210615 (attached as .config) compiler: powerpc64-linux-gcc (GCC) 7.5.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.4.y git checkout f579da2a8c318e5fd1bef6ad5c300386eff9fe7d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the linux-stable-rc/linux-4.4.y HEAD eeb2e2f2ab09a74225c0ea2a481c87aef3557245 builds fine. It only hurts bisectibility. All errors (new ones prefixed by >>): include/linux/compiler.h:163:42: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ arch/powerpc/include/asm/kvm_ppc.h:287:2: note: in expansion of macro 'if' if (vcpu->arch.last_inst == KVM_INST_FETCH_FAILED) ^~ arch/powerpc/include/asm/kvm_ppc.h:287:27: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] if (vcpu->arch.last_inst == KVM_INST_FETCH_FAILED) ^ include/linux/compiler.h:174:16: note: in definition of macro '__trace_if' ______r = !!(cond); \ ^~~~ arch/powerpc/include/asm/kvm_ppc.h:287:2: note: in expansion of macro 'if' if (vcpu->arch.last_inst == KVM_INST_FETCH_FAILED) ^~ arch/powerpc/include/asm/kvm_ppc.h: In function 'kvmppc_mmu_flush_icache': arch/powerpc/include/asm/page.h:129:32: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits] #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) ^ include/linux/compiler.h:163:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ arch/powerpc/include/asm/kvm_ppc.h:525:2: note: in expansion of macro 'if' if (!pfn_valid(pfn)) ^~ arch/powerpc/include/asm/kvm_ppc.h:525:7: note: in expansion of macro 'pfn_valid' if (!pfn_valid(pfn)) ^~~~~~~~~ arch/powerpc/include/asm/page.h:129:32: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits] #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) ^ include/linux/compiler.h:163:42: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ arch/powerpc/include/asm/kvm_ppc.h:525:2: note: in expansion of macro 'if' if (!pfn_valid(pfn)) ^~ arch/powerpc/include/asm/kvm_ppc.h:525:7: note: in expansion of macro 'pfn_valid' if (!pfn_valid(pfn)) ^~~~~~~~~ arch/powerpc/include/asm/page.h:129:32: error: comparison of unsigned expression >= 0 is always true [-Werror=type-limits] #define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr) ^ include/linux/compiler.h:174:16: note: in definition of macro '__trace_if' ______r = !!(cond); \ ^~~~ arch/powerpc/include/asm/kvm_ppc.h:525:2: note: in expansion of macro 'if' if (!pfn_valid(pfn)) ^~ arch/powerpc/include/asm/kvm_ppc.h:525:7: note: in expansion of macro 'pfn_valid' if (!pfn_valid(pfn)) ^~~~~~~~~ arch/powerpc/kernel/setup_64.c: At top level: arch/powerpc/kernel/setup_64.c:254:13: error: no previous declaration for 'early_setup' [-Werror=missing-declarations] void __init early_setup(unsigned long dt_ptr) ^~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:334:6: error: no previous declaration for 'early_setup_secondary' [-Werror=missing-declarations] void early_setup_secondary(void) ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:479:13: error: no previous declaration for 'setup_system' [-Werror=missing-declarations] void __init setup_system(void) ^~~~~~~~~~~~ In file included from include/linux/rcupdate.h:40:0, from include/linux/rbtree.h:34, from include/linux/sched.h:22, from arch/powerpc/kernel/setup_64.c:17: arch/powerpc/kernel/setup_64.c: In function 'irqstack_early_init': include/linux/cpumask.h:223:9: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] (cpu) < nr_cpu_ids;) ^ include/linux/cpumask.h:743:36: note: in expansion of macro 'for_each_cpu' #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) ^~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:624:2: note: in expansion of macro 'for_each_possible_cpu' for_each_possible_cpu(i) { ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c: In function 'emergency_stack_init': include/linux/cpumask.h:223:9: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] (cpu) < nr_cpu_ids;) ^ include/linux/cpumask.h:743:36: note: in expansion of macro 'for_each_cpu' #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) ^~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:682:2: note: in expansion of macro 'for_each_possible_cpu' for_each_possible_cpu(i) { ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c: In function 'setup_per_cpu_areas': include/linux/cpumask.h:223:9: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare] (cpu) < nr_cpu_ids;) ^ include/linux/cpumask.h:743:36: note: in expansion of macro 'for_each_cpu' #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) ^~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c:802:2: note: in expansion of macro 'for_each_possible_cpu' for_each_possible_cpu(cpu) { ^~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kernel/setup_64.c: At top level: arch/powerpc/kernel/setup_64.c:910:6: error: no previous declaration for 'entry_flush_enable' [-Werror=missing-declarations] void entry_flush_enable(bool enable) ^~~~~~~~~~~~~~~~~~ void uaccess_flush_enable(bool enable) ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/uaccess_flush_enable +922 arch/powerpc/kernel/setup_64.c 921 923 { 924 if (enable) { 925 do_uaccess_flush_fixups(enabled_flush_types); 926 if (static_key_initialized) 927 static_branch_enable(&uaccess_flush_key); 928 else 929 printk(KERN_DEBUG "uaccess-flush: deferring static key until after static key initialization\n"); 930 on_each_cpu(do_nothing, NULL, 1); 931 } else { 932 static_branch_disable(&uaccess_flush_key); 933 do_uaccess_flush_fixups(L1D_FLUSH_NONE); 934 } 935 936 uaccess_flush = enable; 937 } 938 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org