tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tglx-pc.2021.05.10a head: 650c7ee79df04a22835a23144ffb918a75ab04e6 commit: 2ae8c0da23534e0cbf43aa185b3f261ce8340e45 [1/13] lib/debug: Remove pointless ARCH_NO_PREEMPT dependencies config: um-allmodconfig (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/paulmck/linux-rcu.git/com... git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git git fetch --no-tags rcu tglx-pc.2021.05.10a git checkout 2ae8c0da23534e0cbf43aa185b3f261ce8340e45 # save the attached .config to linux build tree make W=1 W=1 ARCH=um 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 arch/um/kernel/irq.c:19: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/linux/cpumask.h:10, from arch/um/kernel/irq.c:10: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/irq.c:620:13: warning: no previous prototype for 'init_IRQ' [-Wmissing-prototypes] 620 | void __init init_IRQ(void) | ^~~~~~~~ -- In file included from arch/um/kernel/mem.c:18: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/linux/list.h:9, from include/linux/module.h:12, from arch/um/kernel/mem.c:7: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/mem.c:184:8: warning: no previous prototype for 'pgd_alloc' [-Wmissing-prototypes] 184 | pgd_t *pgd_alloc(struct mm_struct *mm) | ^~~~~~~~~ arch/um/kernel/mem.c:197:7: warning: no previous prototype for 'uml_kmalloc' [-Wmissing-prototypes] 197 | void *uml_kmalloc(int size, int flags) | ^~~~~~~~~~~ -- In file included from arch/um/kernel/process.c:31: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/asm-generic/bug.h:20, from ./arch/um/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/percpu.h:5, from include/linux/context_tracking_state.h:5, from include/linux/hardirq.h:5, from arch/um/kernel/process.c:11: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/process.c:49:5: warning: no previous prototype for 'pid_to_processor_id' [-Wmissing-prototypes] 49 | int pid_to_processor_id(int pid) | ^~~~~~~~~~~~~~~~~~~ arch/um/kernel/process.c:85:7: warning: no previous prototype for '__switch_to' [-Wmissing-prototypes] 85 | void *__switch_to(struct task_struct *from, struct task_struct *to) | ^~~~~~~~~~~ arch/um/kernel/process.c: In function 'new_thread_handler': arch/um/kernel/process.c:120:21: warning: variable 'n' set but not used [-Wunused-but-set-variable] 120 | int (*fn)(void *), n; | ^ arch/um/kernel/process.c: At top level: arch/um/kernel/process.c:138:6: warning: no previous prototype for 'fork_handler' [-Wmissing-prototypes] 138 | void fork_handler(void) | ^~~~~~~~~~~~ arch/um/kernel/process.c:214:6: warning: no previous prototype for 'arch_cpu_idle' [-Wmissing-prototypes] 214 | void arch_cpu_idle(void) | ^~~~~~~~~~~~~ >> arch/um/kernel/process.c:221:5: error: conflicting types for '__cant_sleep' 221 | int __cant_sleep(void) { | ^~~~~~~~~~~~ In file included from include/asm-generic/bug.h:20, from ./arch/um/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/percpu.h:5, from include/linux/context_tracking_state.h:5, from include/linux/hardirq.h:5, from arch/um/kernel/process.c:11: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/process.c:251:5: warning: no previous prototype for 'copy_to_user_proc' [-Wmissing-prototypes] 251 | int copy_to_user_proc(void __user *to, void *from, int size) | ^~~~~~~~~~~~~~~~~ arch/um/kernel/process.c:261:5: warning: no previous prototype for 'clear_user_proc' [-Wmissing-prototypes] 261 | int clear_user_proc(void __user *buf, int size) | ^~~~~~~~~~~~~~~ arch/um/kernel/process.c:274:6: warning: no previous prototype for 'set_using_sysemu' [-Wmissing-prototypes] 274 | void set_using_sysemu(int value) | ^~~~~~~~~~~~~~~~ arch/um/kernel/process.c:281:5: warning: no previous prototype for 'get_using_sysemu' [-Wmissing-prototypes] 281 | int get_using_sysemu(void) | ^~~~~~~~~~~~~~~~ arch/um/kernel/process.c:319:12: warning: no previous prototype for 'make_proc_sysemu' [-Wmissing-prototypes] 319 | int __init make_proc_sysemu(void) | ^~~~~~~~~~~~~~~~ arch/um/kernel/process.c:359:15: warning: no previous prototype for 'arch_align_stack' [-Wmissing-prototypes] 359 | unsigned long arch_align_stack(unsigned long sp) | ^~~~~~~~~~~~~~~~ -- In file included from arch/um/kernel/reboot.c:12: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/linux/list.h:9, from include/linux/rculist.h:10, from include/linux/sched/signal.h:5, from arch/um/kernel/reboot.c:6: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/reboot.c:45:6: warning: no previous prototype for 'machine_restart' [-Wmissing-prototypes] 45 | void machine_restart(char * __unused) | ^~~~~~~~~~~~~~~ arch/um/kernel/reboot.c:51:6: warning: no previous prototype for 'machine_power_off' [-Wmissing-prototypes] 51 | void machine_power_off(void) | ^~~~~~~~~~~~~~~~~ arch/um/kernel/reboot.c:57:6: warning: no previous prototype for 'machine_halt' [-Wmissing-prototypes] 57 | void machine_halt(void) | ^~~~~~~~~~~~ -- In file included from arch/um/kernel/signal.c:14: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/linux/list.h:9, from include/linux/module.h:12, from arch/um/kernel/signal.c:6: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ -- In file included from arch/um/kernel/time.c:20: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/linux/list.h:9, from include/linux/clocksource.h:15, from include/linux/clockchips.h:14, from arch/um/kernel/time.c:10: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/time.c:789:13: warning: no previous prototype for 'time_init' [-Wmissing-prototypes] 789 | void __init time_init(void) | ^~~~~~~~~ -- In file included from arch/um/kernel/tlb.c:15: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/asm-generic/bug.h:20, from ./arch/um/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from arch/um/kernel/tlb.c:6: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/tlb.c:317:6: warning: no previous prototype for 'fix_range_common' [-Wmissing-prototypes] 317 | void fix_range_common(struct mm_struct *mm, unsigned long start_addr, | ^~~~~~~~~~~~~~~~ arch/um/kernel/tlb.c:579:6: warning: no previous prototype for 'flush_tlb_mm_range' [-Wmissing-prototypes] 579 | void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start, | ^~~~~~~~~~~~~~~~~~ arch/um/kernel/tlb.c:595:6: warning: no previous prototype for 'force_flush_all' [-Wmissing-prototypes] 595 | void force_flush_all(void) | ^~~~~~~~~~~~~~~ -- In file included from arch/um/kernel/trap.c:16: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/asm-generic/bug.h:20, from ./arch/um/include/generated/asm/bug.h:1, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/mm.h:9, from arch/um/kernel/trap.c:6: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/trap.c:315:6: warning: no previous prototype for 'trap_init' [-Wmissing-prototypes] 315 | void trap_init(void) | ^~~~~~~~~ -- In file included from arch/um/kernel/um_arch.c:25: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from include/linux/delay.h:22, from arch/um/kernel/um_arch.c:6: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ arch/um/kernel/um_arch.c:359:19: warning: no previous prototype for 'read_initrd' [-Wmissing-prototypes] 359 | int __init __weak read_initrd(void) | ^~~~~~~~~~~ arch/um/kernel/um_arch.c:377:13: warning: no previous prototype for 'check_bugs' [-Wmissing-prototypes] 377 | void __init check_bugs(void) | ^~~~~~~~~~ arch/um/kernel/um_arch.c:387:7: warning: no previous prototype for 'text_poke' [-Wmissing-prototypes] 387 | void *text_poke(void *addr, const void *opcode, size_t len) | ^~~~~~~~~ arch/um/kernel/um_arch.c:399:6: warning: no previous prototype for 'text_poke_sync' [-Wmissing-prototypes] 399 | void text_poke_sync(void) | ^~~~~~~~~~~~~~ -- In file included from arch/um/kernel/skas/syscall.c:9: >> arch/um/include/shared/kern_util.h:54:12: error: conflicting types for '__cant_sleep' 54 | extern int __cant_sleep(void); | ^~~~~~~~~~~~ In file included from arch/um/kernel/skas/syscall.c:6: include/linux/kernel.h:103:13: note: previous declaration of '__cant_sleep' was here 103 | extern void __cant_sleep(const char *file, int line, int preempt_offset); | ^~~~~~~~~~~~ In file included from arch/um/include/asm/processor-generic.h:13, from arch/x86/um/asm/processor.h:41, from include/linux/rcupdate.h:30, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from include/linux/ptrace.h:6, from arch/um/kernel/skas/syscall.c:7: arch/um/kernel/skas/syscall.c: In function 'handle_syscall': arch/x86/um/shared/sysdep/syscalls_64.h:18:4: warning: cast between incompatible function types from 'long int (*)(void)' to 'long int (*)(long int, long int, long int, long int, long int, long int)' [-Wcast-function-type] 18 | (((long (*)(long, long, long, long, long, long)) \ | ^ arch/x86/um/asm/ptrace.h:36:62: note: in definition of macro 'PT_REGS_SET_SYSCALL_RETURN' 36 | #define PT_REGS_SET_SYSCALL_RETURN(r, res) (PT_REGS_AX(r) = (res)) | ^~~ arch/um/kernel/skas/syscall.c:46:5: note: in expansion of macro 'EXECUTE_SYSCALL' 46 | EXECUTE_SYSCALL(syscall, regs)); | ^~~~~~~~~~~~~~~ vim +/__cant_sleep +54 arch/um/include/shared/kern_util.h 5cb38bc47bf3705 arch/um/include/kern_util.h Jeff Dike 2006-06-04 49 edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 50 /* edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 51 * Are we disallowed to sleep? Used to choose between GFP_KERNEL and edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 52 * GFP_ATOMIC. edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 53 */ b63162939cd797c arch/um/include/kern_util.h Paolo 'Blaisorblade' Giarrusso 2006-01-18 @54 extern int __cant_sleep(void); c2220b2a124d2fe arch/um/include/shared/kern_util.h Al Viro 2012-01-30 55 extern int get_current_pid(void); edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 56 extern int copy_from_user_proc(void *to, void *from, int size); edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 57 extern int cpu(void); edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 58 extern char *uml_strdup(const char *string); edea138584d7586 arch/um/include/kern_util.h Jeff Dike 2008-02-04 59 :::::: The code at line 54 was first introduced by commit :::::: b63162939cd797c8269964ce856ed1f2fec5f70e [PATCH] uml: avoid malloc to sleep in atomic sections :::::: TO: Paolo 'Blaisorblade' Giarrusso <blaisorblade(a)yahoo.it&gt; :::::: CC: Linus Torvalds <torvalds(a)g5.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org