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

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Message-ID: <d227e982-d69d-45b7-9388-9082f86af69c@web.de>
Date: Thu, 30 Oct 2025 11:19:10 +0100
From: Markus Elfring <Markus.Elfring@....de>
To: Julia Lawall <julia.lawall@...ia.fr>, cocci@...ia.fr
Cc: LKML <linux-kernel@...r.kernel.org>, kernel-janitors@...r.kernel.org,
 Miaoqian Lin <linmq006@...il.com>
Subject: Re: [cocci] [RFC] Increasing usage of direct pointer assignments from
 memcpy() calls with SmPL?

…> I think you would get a more satisfactory result by just removing all of
> the code and adding it back. Then Coccinelle would take charge of laying
> out the whole thing.
…

See also once more:

>> Another SmPL script example might become helpful.
>>
>> @replacement2@
>> expression object, size, source, target;
>> @@
>>  target =
>> -         object; memcpy(target, source, size)
>> +         memcpy(object, source, size)
>>  ;
>>
>>
>> Markus_Elfring@...ne:…/Projekte/Linux/next-analyses> time /usr/bin/spatch --max-width 100 --no-loops …/Projekte/Coccinelle/janitor/use_memcpy_assignment2.cocci arch/arm64/kvm/arm.c
…>> real    0m0,626s
>> user    0m0,588s
>> sys     0m0,037s

Regards,
Markus