netdev - Re: [PATCH v2 03/16] bitmap: Use FIELD_PREP() in expansion of FIELD_PREP

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Message-ID: <CAMuHMdV3WAxshZL9gw4+NeovX-9FjUZrk+coUAA7+=y6GmPECA@mail.gmail.com>
Date: Wed, 21 Jan 2026 17:50:21 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: david.laight.linux@...il.com
Cc: Yury Norov <yury.norov@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	Alexandre Belloni <alexandre.belloni@...tlin.com>, 
	Jonathan Cameron <Jonathan.Cameron@...wei.com>, Crt Mori <cmo@...exis.com>, 
	Richard Genoud <richard.genoud@...tlin.com>, Andy Shevchenko <andriy.shevchenko@...el.com>, 
	Luo Jie <quic_luoj@...cinc.com>, Peter Zijlstra <peterz@...radead.org>, 
	Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, 
	"David S . Miller" <davem@...emloft.net>, Mika Westerberg <mika.westerberg@...ux.intel.com>, 
	Andreas Noever <andreas.noever@...il.com>, Yehezkel Bernat <YehezkelShB@...il.com>, 
	Nicolas Frattaroli <nicolas.frattaroli@...labora.com>
Subject: Re: [PATCH v2 03/16] bitmap: Use FIELD_PREP() in expansion of FIELD_PREP_WM16()

On Fri, 12 Dec 2025 at 20:38, <david.laight.linux@...il.com> wrote:
> From: David Laight <david.laight.linux@...il.com>
>
> Instead of directly expanding __BF_FIELD_CHECK() (which really ought
> not be used outside bitfield) and open-coding the generation of the
> masked value, just call FIELD_PREP() and add an extra check for
> the mask being at most 16 bits.
> The extra check is added after calling FIELD_PREP() to get a sane
> error message if 'mask' isn't constant.
>
> Remove the leading _ from the formal parameter names.
> Prefix the local variables with _wm16_ to hopefully make them
> unique.
>
> Signed-off-by: David Laight <david.laight.linux@...il.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds