Hi "周琰杰, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on robh/for-next] [also build test WARNING on tip/timers/core linus/master v5.7-rc6] [cannot apply to linux/master next-20200518] [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/Zhou-Yanjie/Introduce-SMP-support-for-CI20-based-on-JZ4780/20200519-224008 base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next config: mips-allyesconfig (attached as .config) compiler: mips-linux-gcc (GCC) 9.3.0 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 COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>, old ones prefixed by <<): >> arch/mips/kernel/idle.c:97:6: warning: no previous prototype for 'jz4780_smp_wait_irqoff' [-Wmissing-prototypes] 97 | void jz4780_smp_wait_irqoff(void) | ^~~~~~~~~~~~~~~~~~~~~~ arch/mips/kernel/idle.c:155:13: warning: no previous prototype for 'check_wait' [-Wmissing-prototypes] 155 | void __init check_wait(void) | ^~~~~~~~~~ vim +/jz4780_smp_wait_irqoff +97 arch/mips/kernel/idle.c 90 91 /* 92 * The Ingenic jz4780 SMP variant has to write back dirty cache lines before 93 * executing wait. The CPU & cache clock will be gated until we return from 94 * the wait, and if another core attempts to access data from our data cache 95 * during this time then it will lock up. 96 */ > 97 void jz4780_smp_wait_irqoff(void) 98 { 99 unsigned long pending = read_c0_cause() & read_c0_status() & CAUSEF_IP; 100 101 /* 102 * Going to idle has a significant overhead due to the cache flush so 103 * try to avoid it if we'll immediately be woken again due to an IRQ. 104 */ 105 if (!need_resched() && !pending) { 106 r4k_blast_dcache(); 107 108 __asm__( 109 " .set push \n" 110 " .set mips3 \n" 111 " sync \n" 112 " wait \n" 113 " .set pop \n"); 114 } 115 116 local_irq_enable(); 117 } 118 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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