tree: https://github.com/ammarfaizi2/linux-block crng/random/jd/canary-mask head: a07711c2f9d0a5be66a965784a73e6c2c7a837d8 commit: fcc6279dcb571e541e585909b1946ef4d240990d [9/10] stackprotector: move CANARY_MASK and get_random_canary() into stackprotector.h config: i386-randconfig-a014 compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce (this is a W=1 build): # https://github.com/ammarfaizi2/linux-block/commit/fcc6279dcb571e541e585909b1946ef4d240990d git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block git fetch --no-tags ammarfaizi2-block crng/random/jd/canary-mask git checkout fcc6279dcb571e541e585909b1946ef4d240990d # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All errors (new ones prefixed by >>): arch/x86/kernel/smpboot.c: In function 'common_cpu_up': >> arch/x86/kernel/smpboot.c:1050:9: error: implicit declaration of function 'cpu_init_stack_canary'; did you mean 'boot_init_stack_canary'? [-Werror=implicit-function-declaration] 1050 | cpu_init_stack_canary(cpu, idle); | ^~~~~~~~~~~~~~~~~~~~~ | boot_init_stack_canary cc1: some warnings being treated as errors vim +1050 arch/x86/kernel/smpboot.c e1c467e69040c3 Fenghua Yu 2012-11-14 1041 66c7ceb47f628c Thomas Gleixner 2019-04-14 1042 int common_cpu_up(unsigned int cpu, struct task_struct *idle) 3f85483bd80ef1 Boris Ostrovsky 2015-04-01 1043 { 66c7ceb47f628c Thomas Gleixner 2019-04-14 1044 int ret; 66c7ceb47f628c Thomas Gleixner 2019-04-14 1045 3f85483bd80ef1 Boris Ostrovsky 2015-04-01 1046 /* Just in case we booted with a single CPU. */ 3f85483bd80ef1 Boris Ostrovsky 2015-04-01 1047 alternatives_enable_smp(); 3f85483bd80ef1 Boris Ostrovsky 2015-04-01 1048 3f85483bd80ef1 Boris Ostrovsky 2015-04-01 1049 per_cpu(current_task, cpu) = idle; c9a1ff316bc9b1 Brian Gerst 2020-06-17 @1050 cpu_init_stack_canary(cpu, idle); 3f85483bd80ef1 Boris Ostrovsky 2015-04-01 1051 66c7ceb47f628c Thomas Gleixner 2019-04-14 1052 /* Initialize the interrupt stack(s) */ 66c7ceb47f628c Thomas Gleixner 2019-04-14 1053 ret = irq_init_percpu_irqstack(cpu); 66c7ceb47f628c Thomas Gleixner 2019-04-14 1054 if (ret) 66c7ceb47f628c Thomas Gleixner 2019-04-14 1055 return ret; 66c7ceb47f628c Thomas Gleixner 2019-04-14 1056 :::::: The code at line 1050 was first introduced by commit :::::: c9a1ff316bc9b1d1806a4366d0aef6e18833ba52 x86/stackprotector: Pre-initialize canary for secondary CPUs :::::: TO: Brian Gerst :::::: CC: Borislav Petkov -- 0-DAY CI Kernel Test Service https://01.org/lkp