netdev - Re: [PATCH net-next 00/12] net: stmmac: replace boolean fields in plat_stmmacenet

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Date: Thu, 22 Jun 2023 09:07:15 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, 
	Jose Abreu <joabreu@...opsys.com>, "David S . Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
	Maxime Coquelin <mcoquelin.stm32@...il.com>, Vinod Koul <vkoul@...nel.org>, 
	Bhupesh Sharma <bhupesh.sharma@...aro.org>, Chen-Yu Tsai <wens@...e.org>, 
	Jernej Skrabec <jernej.skrabec@...il.com>, Samuel Holland <samuel@...lland.org>, 
	Thierry Reding <thierry.reding@...il.com>, Jonathan Hunter <jonathanh@...dia.com>, 
	Richard Cochran <richardcochran@...il.com>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, netdev@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	linux-sunxi@...ts.linux.dev, linux-tegra@...r.kernel.org, 
	linux-mediatek@...ts.infradead.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH net-next 00/12] net: stmmac: replace boolean fields in
 plat_stmmacenet_data with flags

On Wed, Jun 21, 2023 at 10:12 PM Jakub Kicinski <kuba@...nel.org> wrote:
>
> On Wed, 21 Jun 2023 20:25:46 +0200 Bartosz Golaszewski wrote:
> > As suggested by Jose Abreu: let's drop all 12 boolean fields in
> > plat_stmmacenet_data and replace them with a common bitfield.
>
> Is that what Jose meant, or:
>
> -       bool has_integrated_pcs;
> +       u32 has_integrated_pcs:1;
>
> ?

For that to work all fields would need to be gathered together (unless
the structure is __packed - not a good idea) and all future fields
would need to be added in a specific place in the structure definition
as well. I think a bit field is clearer and harder to get wrong here.

Bart