Re: [PATCH v2] ftrace: Cleanup ftrace_dyn_arch_init()

[Weizhao Ouyang <o451686892@xxxxxxxxx>]

On 2021/9/6 22:22, Michael Ellerman wrote:
> Weizhao Ouyang <o451686892@xxxxxxxxx> writes:
>> Most of ARCHs use empty ftrace_dyn_arch_init(), introduce a weak common
>> ftrace_dyn_arch_init() to cleanup them.
>>
>> Signed-off-by: Weizhao Ouyang <o451686892@xxxxxxxxx>
>> Acked-by: Heiko Carstens <hca@xxxxxxxxxxxxx> (s390)
>>
>> ---
>>
>> Changes in v2:
>> -- correct CONFIG_DYNAMIC_FTRACE on PowerPC
>> -- add Acked-by tag
>> diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
>> index debe8c4f7062..d59f67c0225f 100644
>> --- a/arch/powerpc/include/asm/ftrace.h
>> +++ b/arch/powerpc/include/asm/ftrace.h
>> @@ -61,6 +61,10 @@ struct dyn_arch_ftrace {
>>  };
>>  #endif /* __ASSEMBLY__ */
>>  
>> +#ifdef CONFIG_DYNAMIC_FTRACE
>> +int __init ftrace_dyn_arch_init(void);
>> +#endif /* CONFIG_DYNAMIC_FTRACE */
>> +
>>  #ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
>>  #define ARCH_SUPPORTS_FTRACE_OPS 1
>>  #endif
> That breaks the build for powerpc:
>
>   /linux/arch/powerpc/include/asm/ftrace.h: Assembler messages:
>   /linux/arch/powerpc/include/asm/ftrace.h:65: Error: unrecognized opcode: `int'
>   make[4]: *** [/linux/scripts/Makefile.build:352: arch/powerpc/kernel/trace/ftrace_64.o] Error 1
>   make[3]: *** [/linux/scripts/Makefile.build:514: arch/powerpc/kernel/trace] Error 2
>   make[2]: *** [/linux/scripts/Makefile.build:514: arch/powerpc/kernel] Error 2
>   make[1]: *** [/linux/Makefile:1861: arch/powerpc] Error 2
>   make[1]: *** Waiting for unfinished jobs....
>
> It needs to be inside an #ifndef __ASSEMBLY__ section.
>
> cheers

Thanks for reply, I'll fix it up.