linux-kernel - Re: [PATCH net-next 1/5] netdevice: convert private flags

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Date: Wed, 26 Jun 2024 07:51:17 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: Alexander Lobakin <aleksander.lobakin@...el.com>
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, David Ahern
 <dsahern@...nel.org>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Andrew Lunn
 <andrew@...n.ch>, nex.sw.ncis.osdt.itp.upstreaming@...el.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/5] netdevice: convert private flags > BIT(31)
 to bitfields

On Tue, 25 Jun 2024 13:44:28 +0200 Alexander Lobakin wrote:
> +	struct_group(__priv_flags,
> +		unsigned long		priv_flags:32;
> +		unsigned long		see_all_hwtstamp_requests:1;
> +		unsigned long		change_proto_down:1;
> +	);

I don't think we should group them indiscriminately. Better to add the
asserts flag by flag. Neither of the flags you're breaking out in this
patch are used on the fast path.

Or is the problem that CACHELINE_ASSERT_GROUP_MEMBER doesn't work on
bitfields?