Re: [ammarfaizi2-block:arm64/linux/for-next/misc 2/2] arch/arm64/kernel/irq.c:81:6: warning: no previous prototype for function 'do_softirq_own_stack'

[Qi Zheng <zhengqi.arch@bytedance.com>]

On 2022/9/9 14:30, Arnd Bergmann wrote:
> On Fri, Sep 9, 2022, at 5:12 AM, kernel test robot wrote:
>> tree:   https://github.com/ammarfaizi2/linux-block
>> arm64/linux/for-next/misc
>> head:   2d2f3bb897a3de4190b1b6b296c3429d01327554
>> commit: 2d2f3bb897a3de4190b1b6b296c3429d01327554 [2/2] arm64: run
>> softirqs on the per-CPU IRQ stack
>> config: arm64-randconfig-r023-20220907
>> compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project
>> 1546df49f5a6d09df78f569e4137ddb365a3e827)
>> 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 arm64 cross compiling tool for clang build
>>          # apt-get install binutils-aarch64-linux-gnu
>>          #
>> https://github.com/ammarfaizi2/linux-block/commit/2d2f3bb897a3de4190b1b6b296c3429d01327554
>>          git remote add ammarfaizi2-block
>> https://github.com/ammarfaizi2/linux-block
>>          git fetch --no-tags ammarfaizi2-block arm64/linux/for-next/misc
>>          git checkout 2d2f3bb897a3de4190b1b6b296c3429d01327554
>>          # save the config file
>>          mkdir build_dir && cp config build_dir/.config
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1
>> O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kernel/
>>
>> If you fix the issue, kindly add following tag where applicable
>> Reported-by: kernel test robot <lkp@intel.com>
>>
>> All warnings (new ones prefixed by >>):
>>
>>>> arch/arm64/kernel/irq.c:81:6: warning: no previous prototype for function 'do_softirq_own_stack' [-Wmissing-prototypes]
>>     void do_softirq_own_stack(void)
>>          ^
>>     arch/arm64/kernel/irq.c:81:1: note: declare 'static' if the function
>> is not intended to be used outside of this translation unit
>>     void do_softirq_own_stack(void)
>>     ^
>>     static
> 
> 
> I think we are missing an "#include <asm/softirq_stack.h>"
> in arch/arm64/kernel/irq.c

Indeed. Hi Catalin, do I need to resend the v4 version? Or can you help
me to apply the following code change to the for-next/misc directly?
Both are fine for me, depending on which way is convenient for you. :)

diff --git a/arch/arm64/kernel/irq.c b/arch/arm64/kernel/irq.c
index c36ad20a52f3..181df57c812b 100644
--- a/arch/arm64/kernel/irq.c
+++ b/arch/arm64/kernel/irq.c
@@ -23,6 +23,7 @@
  #include <asm/daifflags.h>
  #include <asm/vmap_stack.h>
  #include <asm/exception.h>
+#include <asm/softirq_stack.h>

  /* Only access this in an NMI enter/exit */
  DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);

BTW, when I just compiled the kernel with W=1, I found a lot of
compilation warnings, which is somewhat unexpected.

Thanks,
Qi

> 
>         Arnd

-- 
Thanks,
Qi