linux-kernel - Re: [PATCH] tracing: Remove second parameter to __assign_rel

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Message-Id: <20240226093414.0ff0276080d61be9d4b68a73@kernel.org>
Date: Mon, 26 Feb 2024 09:34:14 +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] tracing: Remove second parameter to __assign_rel_str()

On Fri, 23 Feb 2024 16:25:19 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> The second parameter of __assign_rel_str() is no longer used. It can be removed.
> 
> Note, the only real users of rel_string is user events. This code is just
> in the sample code for testing purposes.
> 
> This makes __assign_rel_str() different than __assign_str() but that's
> fine. __assign_str() is used over 700 places and has a larger impact. That
> change will come later.

Looks good to me.

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

Thanks,

> 
> Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
> ---
>  include/trace/stages/stage6_event_callback.h | 2 +-
>  samples/trace_events/trace-events-sample.h   | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/trace/stages/stage6_event_callback.h b/include/trace/stages/stage6_event_callback.h
> index 935608971899..a0c15f67eabe 100644
> --- a/include/trace/stages/stage6_event_callback.h
> +++ b/include/trace/stages/stage6_event_callback.h
> @@ -91,7 +91,7 @@
>  #define __rel_string_len(item, src, len) __rel_dynamic_array(char, item, -1)
>  
>  #undef __assign_rel_str
> -#define __assign_rel_str(dst, src)					\
> +#define __assign_rel_str(dst)						\
>  	do {								\
>  		char *__str__ = __get_rel_str(dst);			\
>  		int __len__ = __get_rel_dynamic_array_len(dst) - 1;	\
> diff --git a/samples/trace_events/trace-events-sample.h b/samples/trace_events/trace-events-sample.h
> index 2dfaf7fc7bfa..500981eca74d 100644
> --- a/samples/trace_events/trace-events-sample.h
> +++ b/samples/trace_events/trace-events-sample.h
> @@ -574,7 +574,7 @@ TRACE_EVENT(foo_rel_loc,
>  	),
>  
>  	TP_fast_assign(
> -		__assign_rel_str(foo, foo);
> +		__assign_rel_str(foo);
>  		__entry->bar = bar;
>  		__assign_rel_bitmask(bitmask, mask,
>  			BITS_PER_BYTE * sizeof(unsigned long));
> -- 
> 2.43.0
> 


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