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Date: Thu, 2 Dec 2021 15:34:36 +0800
From: Rong Chen <rong.a.chen@...el.com>
To: Ard Biesheuvel <ardb@...nel.org>, kernel test robot <lkp@...el.com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [kbuild-all] Re: [ardb:for-kernelci 25/25]
arch/arm/kernel/traps.c:865:17: warning: no previous prototype for function
'handle_bad_stack'
On 11/30/21 21:12, Ard Biesheuvel wrote:
> On Thu, 25 Nov 2021 at 02:35, kernel test robot <lkp@...el.com> wrote:
>> tree: git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git for-kernelci
>> head: 5da04a8b7050432b72f6551b6c95e4b5b5fd68d1
>> commit: 5da04a8b7050432b72f6551b6c95e4b5b5fd68d1 [25/25] ARM: implement THREAD_INFO_IN_TASK for uniprocessor systems
>> config: arm-randconfig-r024-20211124 (https://download.01.org/0day-ci/archive/20211125/202111250918.ErFZktQF-lkp@intel.com/config)
>> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 67a1c45def8a75061203461ab0060c75c864df1c)
>> reproduce (this is a W=1 build):
>> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>> chmod +x ~/bin/make.cross
>> # install arm cross compiling tool for clang build
>> # apt-get install binutils-arm-linux-gnueabi
>> # https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/commit/?id=5da04a8b7050432b72f6551b6c95e4b5b5fd68d1
>> git remote add ardb git://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git
>> git fetch --no-tags ardb for-kernelci
>> git checkout 5da04a8b7050432b72f6551b6c95e4b5b5fd68d1
>> # save the config file to linux build tree
>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@...el.com>
>>
>> All warnings (new ones prefixed by >>):
>>
> This is yet another false positive. asmlinkage routines don't need a
> prototype because they are called from assembler. This is not going to
> get fixed, so please don't report this error anymore.
Hi Ard,
Sorry for the noise, we'll ignore the warnings in the future.
Best Regards,
Rong Chen
>
>
>> arch/arm/kernel/traps.c:95:6: warning: no previous prototype for function 'dump_backtrace_stm' [-Wmissing-prototypes]
>> void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl)
>> ^
>> arch/arm/kernel/traps.c:95:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> void dump_backtrace_stm(u32 *stack, u32 instruction, const char *loglvl)
>> ^
>> static
>> arch/arm/kernel/traps.c:446:17: warning: no previous prototype for function 'do_undefinstr' [-Wmissing-prototypes]
>> asmlinkage void do_undefinstr(struct pt_regs *regs)
>> ^
>> arch/arm/kernel/traps.c:446:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage void do_undefinstr(struct pt_regs *regs)
>> ^
>> static
>> arch/arm/kernel/traps.c:511:39: warning: no previous prototype for function 'handle_fiq_as_nmi' [-Wmissing-prototypes]
>> asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs)
>> ^
>> arch/arm/kernel/traps.c:511:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage void __exception_irq_entry handle_fiq_as_nmi(struct pt_regs *regs)
>> ^
>> static
>> arch/arm/kernel/traps.c:530:17: warning: no previous prototype for function 'bad_mode' [-Wmissing-prototypes]
>> asmlinkage void bad_mode(struct pt_regs *regs, int reason)
>> ^
>> arch/arm/kernel/traps.c:530:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage void bad_mode(struct pt_regs *regs, int reason)
>> ^
>> static
>> arch/arm/kernel/traps.c:603:16: warning: no previous prototype for function 'arm_syscall' [-Wmissing-prototypes]
>> asmlinkage int arm_syscall(int no, struct pt_regs *regs)
>> ^
>> arch/arm/kernel/traps.c:603:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage int arm_syscall(int no, struct pt_regs *regs)
>> ^
>> static
>> arch/arm/kernel/traps.c:729:1: warning: no previous prototype for function 'baddataabort' [-Wmissing-prototypes]
>> baddataabort(int code, unsigned long instr, struct pt_regs *regs)
>> ^
>> arch/arm/kernel/traps.c:728:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage void
>> ^
>> static
>> arch/arm/kernel/traps.c:769:17: warning: no previous prototype for function '__div0' [-Wmissing-prototypes]
>> asmlinkage void __div0(void)
>> ^
>> arch/arm/kernel/traps.c:769:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage void __div0(void)
>> ^
>> static
>>>> arch/arm/kernel/traps.c:865:17: warning: no previous prototype for function 'handle_bad_stack' [-Wmissing-prototypes]
>> asmlinkage void handle_bad_stack(struct pt_regs *regs)
>> ^
>> arch/arm/kernel/traps.c:865:12: note: declare 'static' if the function is not intended to be used outside of this translation unit
>> asmlinkage void handle_bad_stack(struct pt_regs *regs)
>> ^
>> static
>> 8 warnings generated.
>>
>>
>> vim +/handle_bad_stack +865 arch/arm/kernel/traps.c
>>
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 864
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 @865 asmlinkage void handle_bad_stack(struct pt_regs *regs)
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 866 {
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 867 unsigned long tsk_stk = (unsigned long)current->stack;
>> 5da04a8b705043 Ard Biesheuvel 2021-11-24 868 #ifdef CONFIG_IRQSTACKS
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 869 unsigned long irq_stk = (unsigned long)this_cpu_read(irq_stack_ptr);
>> 5da04a8b705043 Ard Biesheuvel 2021-11-24 870 #endif
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 871 unsigned long ovf_stk = (unsigned long)this_cpu_read(overflow_stack_ptr);
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 872
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 873 console_verbose();
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 874 pr_emerg("Insufficient stack space to handle exception!");
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 875
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 876 pr_emerg("Task stack: [0x%08lx..0x%08lx]\n",
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 877 tsk_stk, tsk_stk + THREAD_SIZE);
>> 5da04a8b705043 Ard Biesheuvel 2021-11-24 878 #ifdef CONFIG_IRQSTACKS
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 879 pr_emerg("IRQ stack: [0x%08lx..0x%08lx]\n",
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 880 irq_stk - THREAD_SIZE, irq_stk);
>> 5da04a8b705043 Ard Biesheuvel 2021-11-24 881 #endif
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 882 pr_emerg("Overflow stack: [0x%08lx..0x%08lx]\n",
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 883 ovf_stk - OVERFLOW_STACK_SIZE, ovf_stk);
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 884
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 885 die("kernel stack overflow", regs, 0);
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 886 }
>> adc7d753de62f2 Ard Biesheuvel 2021-09-23 887
>>
>> :::::: The code at line 865 was first introduced by commit
>> :::::: adc7d753de62f220505f528106a6d618104302c5 ARM: implement support for vmap'ed stacks
>>
>> :::::: TO: Ard Biesheuvel <ardb@...nel.org>
>> :::::: CC: Ard Biesheuvel <ardb@...nel.org>
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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