linux-kernel - Re: [RFC PATCH 3/6] block: add new genhd flag GENHD_FL_NO

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Date:   Thu, 20 Jul 2023 10:24:18 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Daniel Golle <daniel@...rotopia.org>, Jens Axboe <axboe@...nel.dk>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Dave Chinner <dchinner@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Thomas Weißschuh <linux@...ssschuh.net>,
        Jan Kara <jack@...e.cz>, Damien Le Moal <dlemoal@...nel.org>,
        Ming Lei <ming.lei@...hat.com>, Min Li <min15.li@...sung.com>,
        Christian Loehle <CLoehle@...erstone.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jack Wang <jinpu.wang@...os.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Yeqi Fu <asuk4.q@...il.com>, Avri Altman <avri.altman@....com>,
        Hans de Goede <hdegoede@...hat.com>,
        Ye Bin <yebin10@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafał Miłecki <rafal@...ecki.pl>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [RFC PATCH 3/6] block: add new genhd flag GENHD_FL_NO_NVMEM

On 7/20/23 00:03, Daniel Golle wrote:
> Add new flag to destinguish block devices which should not act as an
> NVMEM provider, such as for example an emulated block device on top of
> an MTD partition which already acts as an NVMEM provider itself.
> 
> Signed-off-by: Daniel Golle <daniel@...rotopia.org>
> ---
>   include/linux/blkdev.h | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 2f5371b8482c0..e853d1815be15 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -80,11 +80,14 @@ 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_NO_NVMEM``: NVMEM emulation is disabled.  The kernel will not
> + * emulate an NVMEM device on top of this disk.
>    */
>   enum {
>   	GENHD_FL_REMOVABLE			= 1 << 0,
>   	GENHD_FL_HIDDEN				= 1 << 1,
>   	GENHD_FL_NO_PART			= 1 << 2,
> +	GENHD_FL_NO_NVMEM			= 1 << 3,
>   };
>   
>   enum {
Please reverse this flag. Most of the devices will not have an NVMEM 
partition, and we shouldn't require each and every driver to tag their 
devices.
So please use GENHD_FL_NVMEM and only set this flag on devices which 
really have an NVMEM partition.

Cheers,

Hannes