linux-kernel - Re: [PATCH] nds32: ftrace: fix pointer comparison warning

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Date:   Wed, 27 Oct 2021 12:16:47 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Zong Li <zong@...estech.com>, Nick Hu <nickhu@...estech.com>,
        Vincent Chen <deanbo422@...il.com>
Subject: Re: [PATCH] nds32: ftrace: fix pointer comparison warning

On 10/27/21 4:59 AM, Steven Rostedt wrote:
> On Tue, 26 Oct 2021 22:55:54 -0700
> Randy Dunlap <rdunlap@...radead.org> wrote:
> 
>> GCC 11.1.0 for nds32 (nds32le if it matters) complains:
>>
>> ../arch/nds32/kernel/ftrace.c: In function '_mcount':
>> ../arch/nds32/kernel/ftrace.c:24:35: error: comparison of distinct pointer types lacks a cast [-Werror]
>>     24 |         if (ftrace_trace_function != ftrace_stub)
>>        |                                   ^~
>>
>> Cast the second function (pointer) to (void *) to avoid the warning.
>>
>> Fixes: a18082575c66 ("nds32/ftrace: Support static function tracer")
>> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
>> Reported-by: kernel test robot <lkp@...el.com>
>> To: Greentime Hu <green.hu@...il.com>
>> Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
>> Cc: Masami Hiramatsu <mhiramat@...nel.org>
>> Cc: Zong Li <zong@...estech.com>
>> Cc: Nick Hu <nickhu@...estech.com>
>> Cc: Vincent Chen <deanbo422@...il.com>
>> ---
>>   arch/nds32/kernel/ftrace.c |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> --- linux-next-20211026.orig/arch/nds32/kernel/ftrace.c
>> +++ linux-next-20211026/arch/nds32/kernel/ftrace.c
>> @@ -21,7 +21,7 @@ noinline void _mcount(unsigned long pare
>>   
>>   	unsigned long ip = (unsigned long)__builtin_return_address(0);
>>   
>> -	if (ftrace_trace_function != ftrace_stub)
>> +	if (ftrace_trace_function != (void *)ftrace_stub)
>>   		ftrace_trace_function(ip - MCOUNT_INSN_SIZE, parent_ip,
>>   				      NULL, NULL);
>>   
> 
> Or update ftrace_trace_function prototype that was missed when ftrace_stub
> prototype was updated.
> 
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
> diff --git a/arch/nds32/kernel/ftrace.c b/arch/nds32/kernel/ftrace.c
> index f0ef4842d191..711bc8cd186d 100644
> --- a/arch/nds32/kernel/ftrace.c
> +++ b/arch/nds32/kernel/ftrace.c
> @@ -6,7 +6,7 @@
>   
>   #ifndef CONFIG_DYNAMIC_FTRACE
>   extern void (*ftrace_trace_function)(unsigned long, unsigned long,
> -				     struct ftrace_ops*, struct pt_regs*);
> +				     struct ftrace_ops*, struct ftrace_regs*);
>   extern void ftrace_graph_caller(void);
>   
>   noinline void __naked ftrace_stub(unsigned long ip, unsigned long parent_ip,
> 

OK, looks good.

Thanks.

-- 
~Randy