linux-kernel - Re: [PATCH v2] tracing: devlink: Use static array for string in devlink_trap

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Date:   Wed, 13 Jul 2022 12:51:30 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, Jiri Pirko <jiri@...dia.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] tracing: devlink: Use static array for string in
 devlink_trap_report even

On Tue, 12 Jul 2022 18:58:20 -0400 Steven Rostedt wrote:
> From: "Steven Rostedt (Google)" <rostedt@...dmis.org>
> 
> The trace event devlink_trap_report uses the __dynamic_array() macro to
> determine the size of the input_dev_name field. This is because it needs
> to test the dev field for NULL, and will use "NULL" if it is. But it also
> has the size of the dynamic array as a fixed IFNAMSIZ bytes. This defeats
> the purpose of the dynamic array, as this will reserve that amount of
> bytes on the ring buffer, and to make matters worse, it will even save
> that size in the event as the event expects it to be dynamic (for which it
> is not).
> 
> Since IFNAMSIZ is just 16 bytes, just make it a static array and this will
> remove the meta data from the event that records the size.
> 
> Cc: Jakub Kicinski <kuba@...nel.org>

Acked-by: Jakub Kicinski <kuba@...nel.org>