Re: [ardb:for-kernelci 25/25] arch/arm/kernel/traps.c:865:17: warning: no previous prototype for function 'handle_bad_stack'

From: Ard Biesheuvel
Date: Tue Nov 30 2021 - 08:12:34 EST

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In reply to: kernel test robot: "[ardb:for-kernelci 25/25] arch/arm/kernel/traps.c:865:17: warning: no previous prototype for function 'handle_bad_stack'"
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On Thu, 25 Nov 2021 at 02:35, kernel test robot <lkp@xxxxxxxxx> 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@xxxxxxxxx/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@xxxxxxxxx>
>
> 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.

> 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@xxxxxxxxxx>
> :::::: CC: Ard Biesheuvel <ardb@xxxxxxxxxx>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Next message: Srinivas Kandagatla: "Re: [PATCH 1/2] misc: fastrpc: Add fdlist implementation"
Previous message: Zhou Qingyang: "[PATCH] drm: bridge: cdns-mhdp8546: Fix a NULL pointer dereference in cdns_mhdp_atomic_enable()"
In reply to: kernel test robot: "[ardb:for-kernelci 25/25] arch/arm/kernel/traps.c:865:17: warning: no previous prototype for function 'handle_bad_stack'"
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