tree: https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git kprobes/kretprobe-stackfix head: 6e2b8966c87adc1be0fb4a386fb24ae438f4cb79 commit: 0d46dfb8d0aa9f3a9b64d8b119bca53bde8fb642 [3/10] kprobes: treewide: Remove trampoline_address from kretprobe_trampoline_handler() config: i386-randconfig-m021-20210316 (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/mhiramat/linux.git/commit... git remote add mhiramat https://git.kernel.org/pub/scm/linux/kernel/git/mhiramat/linux.git git fetch --no-tags mhiramat kprobes/kretprobe-stackfix git checkout 0d46dfb8d0aa9f3a9b64d8b119bca53bde8fb642 # save the attached .config to linux build tree make W=1 ARCH=i386 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/kgdb.h:19, from include/linux/fb.h:5, from drivers/hid/hid-picolcd_core.c:15: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from include/linux/kgdb.h:19, from include/linux/fb.h:5, from drivers/hid/hid-picolcd_core.c:15: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ drivers/hid/hid-picolcd_core.c: In function 'picolcd_raw_event': drivers/hid/hid-picolcd_core.c:332:6: warning: variable 'ret' set but not used [-Wunused-but-set-variable] 332 | int ret = 0; | ^~~ -- In file included from include/linux/kgdb.h:19, from include/linux/fb.h:5, from drivers/hid/hid-picolcd_leds.c:15: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from include/linux/kgdb.h:19, from include/linux/fb.h:5, from drivers/hid/hid-picolcd_leds.c:15: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ -- In file included from init/main.c:36: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from init/main.c:36: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ init/main.c:776:20: warning: no previous prototype for 'mem_encrypt_init' [-Wmissing-prototypes] 776 | void __init __weak mem_encrypt_init(void) { } | ^~~~~~~~~~~~~~~~ -- In file included from arch/x86/include/asm/traps.h:6, from arch/x86/entry/common.c:29: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from arch/x86/include/asm/traps.h:6, from arch/x86/entry/common.c:29: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ arch/x86/entry/common.c:82:24: warning: no previous prototype for 'do_int80_syscall_32' [-Wmissing-prototypes] 82 | __visible noinstr void do_int80_syscall_32(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~ arch/x86/entry/common.c:148:24: warning: no previous prototype for 'do_fast_syscall_32' [-Wmissing-prototypes] 148 | __visible noinstr long do_fast_syscall_32(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~ arch/x86/entry/common.c:200:24: warning: no previous prototype for 'do_SYSENTER_32' [-Wmissing-prototypes] 200 | __visible noinstr long do_SYSENTER_32(struct pt_regs *regs) | ^~~~~~~~~~~~~~ -- In file included from arch/x86/include/asm/traps.h:6, from arch/x86/kernel/irq.c:23: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from arch/x86/include/asm/traps.h:6, from arch/x86/kernel/irq.c:23: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/trace/define_trace.h:102, from arch/x86/include/asm/trace/irq_vectors.h:383, from arch/x86/kernel/irq.c:27: include/trace/trace_events.h:27:23: warning: 'str__irq_vectors__trace_system_name' defined but not used [-Wunused-const-variable=] 27 | #define __app__(x, y) str__##x##y | ^~~~~ include/trace/trace_events.h:28:21: note: in expansion of macro '__app__' 28 | #define __app(x, y) __app__(x, y) | ^~~~~~~ include/trace/trace_events.h:30:29: note: in expansion of macro '__app' 30 | #define TRACE_SYSTEM_STRING __app(TRACE_SYSTEM_VAR,__trace_system_name) | ^~~~~ include/trace/trace_events.h:33:20: note: in expansion of macro 'TRACE_SYSTEM_STRING' 33 | static const char TRACE_SYSTEM_STRING[] = \ | ^~~~~~~~~~~~~~~~~~~ include/trace/trace_events.h:36:1: note: in expansion of macro 'TRACE_MAKE_SYSTEM_STR' 36 | TRACE_MAKE_SYSTEM_STR(); | ^~~~~~~~~~~~~~~~~~~~~ -- In file included from arch/x86/include/asm/traps.h:6, from arch/x86/kernel/doublefault_32.c:11: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from arch/x86/include/asm/traps.h:6, from arch/x86/kernel/doublefault_32.c:11: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ arch/x86/kernel/doublefault_32.c:23:36: warning: no previous prototype for 'doublefault_shim' [-Wmissing-prototypes] 23 | asmlinkage noinstr void __noreturn doublefault_shim(void) | ^~~~~~~~~~~~~~~~ arch/x86/kernel/doublefault_32.c:117:6: warning: no previous prototype for 'doublefault_init_cpu_tss' [-Wmissing-prototypes] 117 | void doublefault_init_cpu_tss(void) | ^~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from arch/x86/kernel/paravirt.c:15: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from arch/x86/kernel/paravirt.c:15: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ arch/x86/kernel/paravirt.c:96:13: warning: no previous prototype for 'native_pv_lock_init' [-Wmissing-prototypes] 96 | void __init native_pv_lock_init(void) | ^~~~~~~~~~~~~~~~~~~ -- In file included from arch/x86/include/asm/traps.h:6, from arch/x86/mm/extable.c:9: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from arch/x86/include/asm/traps.h:6, from arch/x86/mm/extable.c:9: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:27:16: warning: no previous prototype for 'ex_handler_default' [-Wmissing-prototypes] 27 | __visible bool ex_handler_default(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:37:16: warning: no previous prototype for 'ex_handler_fault' [-Wmissing-prototypes] 37 | __visible bool ex_handler_fault(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:58:16: warning: no previous prototype for 'ex_handler_fprestore' [-Wmissing-prototypes] 58 | __visible bool ex_handler_fprestore(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:73:16: warning: no previous prototype for 'ex_handler_uaccess' [-Wmissing-prototypes] 73 | __visible bool ex_handler_uaccess(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:84:16: warning: no previous prototype for 'ex_handler_copy' [-Wmissing-prototypes] 84 | __visible bool ex_handler_copy(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~ arch/x86/mm/extable.c:96:16: warning: no previous prototype for 'ex_handler_rdmsr_unsafe' [-Wmissing-prototypes] 96 | __visible bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:113:16: warning: no previous prototype for 'ex_handler_wrmsr_unsafe' [-Wmissing-prototypes] 113 | __visible bool ex_handler_wrmsr_unsafe(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~~~~~~~~ arch/x86/mm/extable.c:129:16: warning: no previous prototype for 'ex_handler_clear_fs' [-Wmissing-prototypes] 129 | __visible bool ex_handler_clear_fs(const struct exception_table_entry *fixup, | ^~~~~~~~~~~~~~~~~~~ -- In file included from kernel/kallsyms.c:27: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from kernel/kallsyms.c:27: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ kernel/kallsyms.c:457:12: warning: no previous prototype for 'arch_get_kallsym' [-Wmissing-prototypes] 457 | int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value, | ^~~~~~~~~~~~~~~~ -- In file included from include/linux/kgdb.h:19, from kernel/panic.c:15: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from include/linux/kgdb.h:19, from kernel/panic.c:15: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ kernel/panic.c:85:13: warning: no previous prototype for 'panic_smp_self_stop' [-Wmissing-prototypes] 85 | void __weak panic_smp_self_stop(void) | ^~~~~~~~~~~~~~~~~~~ kernel/panic.c:95:13: warning: no previous prototype for 'nmi_panic_self_stop' [-Wmissing-prototypes] 95 | void __weak nmi_panic_self_stop(struct pt_regs *regs) | ^~~~~~~~~~~~~~~~~~~ kernel/panic.c:106:13: warning: no previous prototype for 'crash_smp_send_stop' [-Wmissing-prototypes] 106 | void __weak crash_smp_send_stop(void) | ^~~~~~~~~~~~~~~~~~~ kernel/panic.c: In function '__warn': kernel/panic.c:590:3: warning: function '__warn' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 590 | vprintk(args->fmt, args->args); | ^~~~~~~ kernel/panic.c: At top level: kernel/panic.c:684:24: warning: no previous prototype for '__stack_chk_fail' [-Wmissing-prototypes] 684 | __visible noinstr void __stack_chk_fail(void) | ^~~~~~~~~~~~~~~~ -- In file included from kernel/trace/ftrace.c:37: 208 | void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kprobes.h:32, from kernel/trace/ftrace.c:37: arch/x86/include/asm/kprobes.h:52:17: note: previous declaration of 'kretprobe_trampoline' was here 52 | asmlinkage void kretprobe_trampoline(void); | ^~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:302:5: warning: no previous prototype for '__register_ftrace_function' [-Wmissing-prototypes] 302 | int __register_ftrace_function(struct ftrace_ops *ops) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:345:5: warning: no previous prototype for '__unregister_ftrace_function' [-Wmissing-prototypes] 345 | int __unregister_ftrace_function(struct ftrace_ops *ops) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/trace/ftrace.c:3876:15: warning: no previous prototype for 'arch_ftrace_match_adjust' [-Wmissing-prototypes] 3876 | char * __weak arch_ftrace_match_adjust(char *str, const char *search) | ^~~~~~~~~~~~~~~~~~~~~~~~ .. vim +/kretprobe_trampoline +208 include/linux/kprobes.h 207 209 /* 210 * Since some architecture uses structured function pointer, 211 * use dereference_function_descriptor() to get real function address. 212 */ 213 static nokprobe_inline void *kretprobe_trampoline_addr(void) 214 { 215 return dereference_function_descriptor(kretprobe_trampoline); 216 } 217 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org