linux-kernel - Re: [gustavoars:for-next/cast-function 1/3] kernel/trace/ftrace.c:7029:6: error: no previous prototype for function 'arch_ftrace_ops_list

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Date:   Thu, 14 Oct 2021 13:14:56 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [gustavoars:for-next/cast-function 1/3]
 kernel/trace/ftrace.c:7029:6: error: no previous prototype for function
 'arch_ftrace_ops_list_func'

On Thu, Oct 14, 2021 at 01:53:17PM -0400, Steven Rostedt wrote:
> This should fix this issue as well as some of the other ones reported on
> this commit.
> 
> [ I'll be adding this update to my own version in my tree ]

Great. I'll apply it to my tree. Thanks! :)

--
Gustavo

> 
> -- Steve
> 
> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index b86f52683b6f..8771c435f34b 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -178,7 +178,8 @@
>  			ftrace_ops_list_func = arch_ftrace_ops_list_func;
>  #else
>  # ifdef CONFIG_FUNCTION_TRACER
> -#  define MCOUNT_REC()	ftrace_stub_graph = ftrace_stub;
> +#  define MCOUNT_REC()	ftrace_stub_graph = ftrace_stub;	\
> +			ftrace_ops_list_func = arch_ftrace_ops_list_func;
>  # else
>  #  define MCOUNT_REC()
>  # endif
> diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
> index 832e65f06754..871b51bec170 100644
> --- a/include/linux/ftrace.h
> +++ b/include/linux/ftrace.h
> @@ -30,16 +30,25 @@
>  #define ARCH_SUPPORTS_FTRACE_OPS 0
>  #endif
>  
> +#ifdef CONFIG_FUNCTION_TRACER
> +struct ftrace_ops;
>  /*
>   * If the arch's mcount caller does not support all of ftrace's
>   * features, then it must call an indirect function that
>   * does. Or at least does enough to prevent any unwelcome side effects.
> + *
> + * Also define the function prototype that these architectures use
> + * to call the ftrace_ops_list_func().
>   */
>  #if !ARCH_SUPPORTS_FTRACE_OPS
>  # define FTRACE_FORCE_LIST_FUNC 1
> +void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip);
>  #else
>  # define FTRACE_FORCE_LIST_FUNC 0
> +void arch_ftrace_ops_list_func(unsigned long ip, unsigned long parent_ip,
> +			       struct ftrace_ops *op, struct ftrace_regs *fregs);
>  #endif
> +#endif /* CONFIG_FUNCTION_TRACER */
>  
>  /* Main tracing buffer and events set up */
>  #ifdef CONFIG_TRACING
> @@ -88,8 +97,6 @@ extern int
>  ftrace_enable_sysctl(struct ctl_table *table, int write,
>  		     void *buffer, size_t *lenp, loff_t *ppos);
>  
> -struct ftrace_ops;
> -
>  #ifndef CONFIG_HAVE_DYNAMIC_FTRACE_WITH_ARGS
>  
>  struct ftrace_regs {