tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/fpu head: 42088f5f7dcaf5e6d51b71cb32097ca4dad9b225 commit: ea9a8a73e58ed8b9a24d6c84c033c7064fe2a05c [5/9] jump_label, x86: Improve error when we fail expected text config: x86_64-rhel-8.3 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?... git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git git fetch --no-tags peterz-queue x86/fpu git checkout ea9a8a73e58ed8b9a24d6c84c033c7064fe2a05c # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): In file included from include/linux/kernel.h:16, from arch/x86/include/asm/percpu.h:27, from arch/x86/include/asm/current.h:6, from include/linux/sched.h:12, from include/linux/ratelimit.h:6, from include/linux/dev_printk.h:16, from include/linux/device.h:15, from include/linux/node.h:18, from include/linux/memory.h:19, from arch/x86/kernel/jump_label.c:9: arch/x86/kernel/jump_label.c: In function '__jump_label_set_jump_code': 42 | addr, addr, addr, expect, init, type); | ^~~~ include/linux/printk.h:333:34: note: in definition of macro 'pr_crit' 333 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~~ arch/x86/kernel/jump_label.c:42:31: note: each undeclared identifier is reported only once for each function it appears in 42 | addr, addr, addr, expect, init, type); | ^~~~ include/linux/printk.h:333:34: note: in definition of macro 'pr_crit' 333 | printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__) | ^~~~~~~~~~~ vim +42 arch/x86/kernel/jump_label.c 18 19 static const void * 20 __jump_label_set_jump_code(struct jump_entry *entry, enum jump_label_type type) 21 { 22 const void *expect, *code; 23 const void *addr, *dest; 24 25 addr = (void *)jump_entry_code(entry); 26 dest = (void *)jump_entry_target(entry); 27 28 code = text_gen_insn(JMP32_INSN_OPCODE, addr, dest); 29 30 if (type == JUMP_LABEL_JMP) 31 expect = x86_nops[5]; 32 else 33 expect = code; 34 35 if (memcmp(addr, expect, JUMP_LABEL_NOP_SIZE)) { 36 /* 37 * The location is not an op that we were expecting. 38 * Something went wrong. Crash the box, as something could be 39 * corrupting the kernel. 40 */ 41 pr_crit("jump_label: Fatal kernel bug, unexpected op at %pS [%p] (%5ph != %5ph)) init:%d type:%d\n", 43 BUG(); 44 } 45 46 if (type == JUMP_LABEL_NOP) 47 code = x86_nops[5]; 48 49 return code; 50 } 51 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org