linux-kernel - Re: [cocci] [RFC] Increasing usage of direct pointer assignments from memcpy() calls with SmPL?

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Message-ID: <8c401643-3fe6-4511-b55f-5d7643ad4fa3@web.de>
Date: Fri, 31 Oct 2025 07:00:43 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Dan Carpenter <dan.carpenter@...aro.org>,
 Julia Lawall <julia.lawall@...ia.fr>, cocci@...ia.fr,
 kernel-janitors@...r.kernel.org
Cc: LKML <linux-kernel@...r.kernel.org>, Miaoqian Lin <linmq006@...il.com>
Subject: Re: [cocci] [RFC] Increasing usage of direct pointer assignments from
 memcpy() calls with SmPL?

> No one will thank you for making these changes...  :(  Please don't do it.

I am curious if further developers would dare to try another source code search pattern out.

@display@
expression destination, size, source, target;
@@
*target = memcpy(destination, source, size);

I would like to point out that return values from memcpy() calls are assigned
to variables in 16 source files of the software “Linux next-20251030”.

Under which circumstances can development interests grow to reduce “unused”
return values also for this kind of function?
https://wiki.sei.cmu.edu/confluence/display/c/MSC13-C.+Detect+and+remove+unused+values

Regards,
Markus