[cocci] [PATCH v3 2/6] coccinelle: misc: Add field_modify script

[Markus Elfring]

> This script finds and suggests conversions of opencoded field
> modify patterns with the wrapper FIELD_MODIFY() API defined in
> include/linux/bitfield.h for better readability.

See also:
https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.15-rc3#n94


…
> +++ b/scripts/coccinelle/misc/field_modify.cocci
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +///

I suggest to omit a blank comment line here.


> +/// Replaced below code with the wrapper FIELD_MODIFY(MASK, &reg, val)

Replace?


…
> +// Copyright (C) 2025 Qualcomm Innovation Center, Inc.

Copyright: ?


> +// URL: https://coccinelle.gitlabpages.inria.fr/website

I suggest to omit such information here.


…
> +virtual patch

How do you think about to support additional operation modes?


…
> +- reg &= ~mask;
> +- reg |= FIELD_PREP(mask, val);
> ++ FIELD_MODIFY(mask, &reg, val);

Would you like to integrate the following SmPL code variant?

-reg &= ~mask;
-reg |= FIELD_PREP
+       FIELD_MODIFY
                  (mask,
+                  &reg,
                   val
                  );


Regards,
Markus