Hi Julia, I love your patch! Yet something to improve: [auto build test ERROR on vfio/next] [also build test ERROR on char-misc/char-misc-testing v5.5-rc3 next-20191220] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Julia-Lawall/use-mmgrab/20191230-011611 base: https://github.com/awilliam/linux-vfio.git next config: openrisc-simple_smp_defconfig (attached as .config) compiler: or1k-linux-gcc (GCC) 9.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=9.2.0 make.cross ARCH=openrisc If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): arch/openrisc/kernel/smp.c: In function 'secondary_start_kernel': >> arch/openrisc/kernel/smp.c:116:2: error: implicit declaration of function 'mmgrab'; did you mean 'igrab'? [-Werror=implicit-function-declaration] 116 | mmgrab(mm); | ^~~~~~ | igrab cc1: some warnings being treated as errors vim +116 arch/openrisc/kernel/smp.c 107 108 asmlinkage __init void secondary_start_kernel(void) 109 { 110 struct mm_struct *mm = &init_mm; 111 unsigned int cpu = smp_processor_id(); 112 /* 113 * All kernel threads share the same mm context; grab a 114 * reference and switch to it. 115 */ > 116 mmgrab(mm); 117 current->active_mm = mm; 118 cpumask_set_cpu(cpu, mm_cpumask(mm)); 119 120 pr_info("CPU%u: Booted secondary processor\n", cpu); 121 122 setup_cpuinfo(); 123 openrisc_clockevent_init(); 124 125 notify_cpu_starting(cpu); 126 127 /* 128 * OK, now it's safe to let the boot CPU continue 129 */ 130 complete(&cpu_running); 131 132 synchronise_count_slave(cpu); 133 set_cpu_online(cpu, true); 134 135 local_irq_enable(); 136 137 preempt_disable(); 138 /* 139 * OK, it's off to the idle thread for us 140 */ 141 cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); 142 } 143 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx Intel Corporation
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