[kbuild-all] [kbuild:for-next 13/15] arch/ia64/kernel/crash.c:79:1: warning: no previous prototype for 'machine_crash_shutdown'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git for-next head: 49362029a00b1c8af81d635333806e3d0dc8fdc1 commit: 092d5045cefaf39a0c8ea8a20ccd640a038dac32 [13/15] ia64: remove unneeded header includes from <asm/mca.h> config: ia64-randconfig-r013-20210209 (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 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/masahiroy/linux-kbuild.gi... git remote add kbuild https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git git fetch --no-tags kbuild for-next git checkout 092d5045cefaf39a0c8ea8a20ccd640a038dac32 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): 79 | machine_crash_shutdown(struct pt_regs *pt) | ^~~~~~~~~~~~~~~~~~~~~~ vim +/machine_crash_shutdown +79 arch/ia64/kernel/crash.c a79561134f38de Zou Nan hai 2006-12-07 77 a79561134f38de Zou Nan hai 2006-12-07 78 void a79561134f38de Zou Nan hai 2006-12-07 @79 machine_crash_shutdown(struct pt_regs *pt) a79561134f38de Zou Nan hai 2006-12-07 80 { a79561134f38de Zou Nan hai 2006-12-07 81 /* This function is only called after the system a79561134f38de Zou Nan hai 2006-12-07 82 * has paniced or is otherwise in a critical state. a79561134f38de Zou Nan hai 2006-12-07 83 * The minimum amount of code to allow a kexec'd kernel a79561134f38de Zou Nan hai 2006-12-07 84 * to run successfully needs to happen here. a79561134f38de Zou Nan hai 2006-12-07 85 * a79561134f38de Zou Nan hai 2006-12-07 86 * In practice this means shooting down the other cpus in a79561134f38de Zou Nan hai 2006-12-07 87 * an SMP system. a79561134f38de Zou Nan hai 2006-12-07 88 */ a79561134f38de Zou Nan hai 2006-12-07 89 kexec_disable_iosapic(); a79561134f38de Zou Nan hai 2006-12-07 90 #ifdef CONFIG_SMP 1726b0883dd086 Hidetoshi Seto 2009-08-06 91 /* 1726b0883dd086 Hidetoshi Seto 2009-08-06 92 * If kdump_on_init is set and an INIT is asserted here, kdump will 1726b0883dd086 Hidetoshi Seto 2009-08-06 93 * be started again via INIT monarch. 1726b0883dd086 Hidetoshi Seto 2009-08-06 94 */ 1726b0883dd086 Hidetoshi Seto 2009-08-06 95 local_irq_disable(); 1726b0883dd086 Hidetoshi Seto 2009-08-06 96 ia64_set_psr_mc(); /* mask MCA/INIT */ 1726b0883dd086 Hidetoshi Seto 2009-08-06 97 if (atomic_inc_return(&kdump_in_progress) != 1) 1726b0883dd086 Hidetoshi Seto 2009-08-06 98 unw_init_running(kdump_cpu_freeze, NULL); 1726b0883dd086 Hidetoshi Seto 2009-08-06 99 1726b0883dd086 Hidetoshi Seto 2009-08-06 100 /* 1726b0883dd086 Hidetoshi Seto 2009-08-06 101 * Now this cpu is ready for kdump. 1726b0883dd086 Hidetoshi Seto 2009-08-06 102 * Stop all others by IPI or INIT. They could receive INIT from 1726b0883dd086 Hidetoshi Seto 2009-08-06 103 * outside and might be INIT monarch, but only thing they have to 1726b0883dd086 Hidetoshi Seto 2009-08-06 104 * do is falling into kdump_cpu_freeze(). 1726b0883dd086 Hidetoshi Seto 2009-08-06 105 * 1726b0883dd086 Hidetoshi Seto 2009-08-06 106 * If an INIT is asserted here: 1726b0883dd086 Hidetoshi Seto 2009-08-06 107 * - All receivers might be slaves, since some of cpus could already 1726b0883dd086 Hidetoshi Seto 2009-08-06 108 * be frozen and INIT might be masked on monarch. In this case, 0cced40e7c58b1 Hidetoshi Seto 2009-08-06 109 * all slaves will be frozen soon since kdump_in_progress will let 0cced40e7c58b1 Hidetoshi Seto 2009-08-06 110 * them into DIE_INIT_SLAVE_LEAVE. 1726b0883dd086 Hidetoshi Seto 2009-08-06 111 * - One might be a monarch, but INIT rendezvous will fail since 1726b0883dd086 Hidetoshi Seto 2009-08-06 112 * at least this cpu already have INIT masked so it never join 1726b0883dd086 Hidetoshi Seto 2009-08-06 113 * to the rendezvous. In this case, all slaves and monarch will 0cced40e7c58b1 Hidetoshi Seto 2009-08-06 114 * be frozen soon with no wait since the INIT rendezvous is skipped 0cced40e7c58b1 Hidetoshi Seto 2009-08-06 115 * by kdump_in_progress. 1726b0883dd086 Hidetoshi Seto 2009-08-06 116 */ a79561134f38de Zou Nan hai 2006-12-07 117 kdump_smp_send_stop(); 0ac1faca4a63fc Simon Horman 2007-02-14 118 /* not all cpu response to IPI, send INIT to freeze them */ 5959906ee9dee6 Hidetoshi Seto 2009-08-06 119 if (kdump_wait_cpu_freeze()) { a79561134f38de Zou Nan hai 2006-12-07 120 kdump_smp_send_init(); 5959906ee9dee6 Hidetoshi Seto 2009-08-06 121 /* wait again, don't go ahead if possible */ 5959906ee9dee6 Hidetoshi Seto 2009-08-06 122 kdump_wait_cpu_freeze(); a79561134f38de Zou Nan hai 2006-12-07 123 } a79561134f38de Zou Nan hai 2006-12-07 124 #endif a79561134f38de Zou Nan hai 2006-12-07 125 } a79561134f38de Zou Nan hai 2006-12-07 126 :::::: The code at line 79 was first introduced by commit :::::: a79561134f38de12dce14ed72138f38e55ef53fc [IA64] IA64 Kexec/kdump :::::: TO: Zou Nan hai <nanhai.zou(a)intel.com&gt; :::::: CC: Tony Luck <tony.luck(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org