linux-kernel - Re: [PATCH v4 2/4] block: partitions: populate fwnode

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Date: Fri, 28 Jun 2024 13:16:13 +0100
From: Daniel Golle <daniel@...rotopia.org>
To: Christoph Hellwig <hch@...radead.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ulf Hansson <ulf.hansson@...aro.org>, Jens Axboe <axboe@...nel.dk>,
	Hauke Mehrtens <hauke@...ke-m.de>, Felix Fietkau <nbd@....name>,
	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Dave Chinner <dchinner@...hat.com>, Jan Kara <jack@...e.cz>,
	Christian Brauner <brauner@...nel.org>,
	Thomas Weißschuh <linux@...ssschuh.net>,
	Al Viro <viro@...iv.linux.org.uk>,
	Li Lingfeng <lilingfeng3@...wei.com>,
	Christian Heusel <christian@...sel.eu>,
	Min Li <min15.li@...sung.com>, Avri Altman <avri.altman@....com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Hannes Reinecke <hare@...e.de>,
	Mikko Rapeli <mikko.rapeli@...aro.org>, Yeqi Fu <asuk4.q@...il.com>,
	Victor Shih <victor.shih@...esyslogic.com.tw>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Li Zhijian <lizhijian@...itsu.com>,
	"Ricardo B. Marliere" <ricardo@...liere.net>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH v4 2/4] block: partitions: populate fwnode

Hi Christoph,

thank you for reviewing.

On Thu, Jun 27, 2024 at 09:44:28PM -0700, Christoph Hellwig wrote:
> On Thu, Jun 27, 2024 at 09:50:39PM +0100, Daniel Golle wrote:
> > +		/*
> > +		 * In case 'uuid' is defined in the partitions firmware node require
> > +		 * partition meta info being present and the specified uuid to match.
> > +		 */
> 
> Overly long lines, which is really annyoing for block comments.

Should I use 80 chars as limit everywhere?

> 
> > +		got_uuid = !fwnode_property_read_string(fw_part, "uuid", &uuid);
> > +		if (got_uuid && (!bdev->bd_meta_info ||
> > +				 !part_meta_match(uuid, bdev->bd_meta_info->uuid,
> > +						  PARTITION_META_INFO_UUIDLTH)))
> 
> Can we please not use the crazy part_meta stuff for anything new?
> We should never have merge it, and right now it is at least isolated
> to the boot time root dev_t partsing, and I'd really prefer to keep it
> in that corner.
> 

At least up to my understanding there isn't any other to know a
partitions UUID or volume name.

If there is another way to access this information I'd happily make
use of it, but I couldn't find any.