linux-kernel - Re: [PATCH 3/8] block: add new genhd flag GENHD_FL

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Date: Fri, 22 Mar 2024 10:49:48 -0700
From: Bart Van Assche <bvanassche@....org>
To: Daniel Golle <daniel@...rotopia.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Jens Axboe <axboe@...nel.dk>, Dave Chinner <dchinner@...hat.com>,
 Jan Kara <jack@...e.cz>, Thomas Weißschuh
 <linux@...ssschuh.net>, Damien Le Moal <dlemoal@...nel.org>,
 Li Lingfeng <lilingfeng3@...wei.com>, Christian Brauner
 <brauner@...nel.org>, Christian Heusel <christian@...sel.eu>,
 Min Li <min15.li@...sung.com>, Adrian Hunter <adrian.hunter@...el.com>,
 Avri Altman <avri.altman@....com>, Hannes Reinecke <hare@...e.de>,
 Christian Loehle <CLoehle@...erstone.com>, Bean Huo <beanhuo@...ron.com>,
 Yeqi Fu <asuk4.q@...il.com>, Victor Shih <victor.shih@...esyslogic.com.tw>,
 Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 Dominique Martinet <dominique.martinet@...ark-techno.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 3/8] block: add new genhd flag GENHD_FL_NVMEM

On 3/21/24 12:33, Daniel Golle wrote:
> Add new flag to destinguish block devices which may act as an NVMEM
> provider.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>   include/linux/blkdev.h | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index c3e8f7cf96be9..f2c4f280d7619 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -81,11 +81,13 @@ struct partition_meta_info {
>    * ``GENHD_FL_NO_PART``: partition support is disabled.  The kernel will not
>    * scan for partitions from add_disk, and users can't add partitions manually.
>    *
> + * ``GENHD_FL_NVMEM``: the block device should be considered as NVMEM provider.
>    */
>   enum {
>   	GENHD_FL_REMOVABLE			= 1 << 0,
>   	GENHD_FL_HIDDEN				= 1 << 1,
>   	GENHD_FL_NO_PART			= 1 << 2,
> +	GENHD_FL_NVMEM				= 1 << 3,
>   };

What would break if this flag wouldn't exist?

Thanks,

Bart.