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Date: Thu, 27 May 2021 16:23:50 +0800
From: Rong Chen <rong.a.chen@...el.com>
To: paulmck@...nel.org, kernel test robot <lkp@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: Re: [rcu:tglx-pc.2021.05.25a 1/13]
arch/um/include/shared/kern_util.h:54:12: error: conflicting types for
'__cant_sleep'
On 5/26/21 11:38 PM, Paul E. McKenney wrote:
> On Wed, May 26, 2021 at 06:35:39PM +0800, kernel test robot wrote:
>> tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tglx-pc.2021.05.25a
>> head: 3315aaeb39182958aadff39fa64d66ab241ef120
>> commit: b10e7a6023f08ff0610d24606732e85158c4eed9 [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/commit/?id=b10e7a6023f08ff0610d24606732e85158c4eed9
>> git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
>> git fetch --no-tags rcu tglx-pc.2021.05.25a
>> git checkout b10e7a6023f08ff0610d24606732e85158c4eed9
>> # save the attached .config to linux build tree
>> make W=1 ARCH=um
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All errors (new ones prefixed by >>):
> With this .config, um fails to build even on v5.3-rc3. With the .config
> recommended by the um people, it builds fine both on v5.3-rc3 and with
> each and every commit of the tglx-pc.2021.05.25a patch series.
>
> Therefore, I am not yet convinced that these errors are something that
> we should be worried about.
>
> Thanx, Paul
Hi Paul,
Thanks for the response, we'll only test configs in arch/um/configs to
avoid noise.
Best Regards,
Rong Chen
>
>> 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
>>
>> 5cb38bc47bf370 arch/um/include/kern_util.h Jeff Dike 2006-06-04 49
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 50 /*
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 51 * Are we disallowed to sleep? Used to choose between GFP_KERNEL and
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 52 * GFP_ATOMIC.
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 53 */
>> b63162939cd797 arch/um/include/kern_util.h Paolo 'Blaisorblade' Giarrusso 2006-01-18 @54 extern int __cant_sleep(void);
>> c2220b2a124d2f arch/um/include/shared/kern_util.h Al Viro 2012-01-30 55 extern int get_current_pid(void);
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 56 extern int copy_from_user_proc(void *to, void *from, int size);
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 57 extern int cpu(void);
>> edea138584d758 arch/um/include/kern_util.h Jeff Dike 2008-02-04 58 extern char *uml_strdup(const char *string);
>> edea138584d758 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@...oo.it>
>> :::::: CC: Linus Torvalds <torvalds@...osdl.org>
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>
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