linux-kernel - Re: [PATCH v2] tracing: Add warning if string in __assign_str() does not match _

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Date: Mon, 26 Feb 2024 09:33:28 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v2] tracing: Add warning if string in __assign_str()
 does not match __string()

On Fri, 23 Feb 2024 16:13:56 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> In preparation to remove the second parameter of __assign_str(), make sure
> it is really a duplicate of __string() by adding a WARN_ON_ONCE().
> 

Looks good to me. So eventually this is removed when the second parameter
is removed?

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thank you,

> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
> Changes since v1: https://lore.kernel.org/linux-trace-kernel/20240223154821.77b2426d@gandalf.local.home/
> 
> - If src is NULL it is saved as NULL, no need to not test that too.
> 
>  include/trace/stages/stage6_event_callback.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/include/trace/stages/stage6_event_callback.h b/include/trace/stages/stage6_event_callback.h
> index 0c0f50bcdc56..935608971899 100644
> --- a/include/trace/stages/stage6_event_callback.h
> +++ b/include/trace/stages/stage6_event_callback.h
> @@ -35,6 +35,7 @@
>  	do {								\
>  		char *__str__ = __get_str(dst);				\
>  		int __len__ = __get_dynamic_array_len(dst) - 1;		\
> +		WARN_ON_ONCE((src) != __data_offsets.dst##_ptr_);	\
>  		memcpy(__str__, __data_offsets.dst##_ptr_ ? :		\
>  		       EVENT_NULL_STR, __len__);			\
>  		__str__[__len__] = '\0';				\
> -- 
> 2.43.0
> 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>