Re: [PATCH v13 06/13] null_blk: allow zoned devices with non power-of-2 zone sizes

(off-list ancestor, not in this archive)
[PATCH v13 00/13] support zoned block devices with non-power-of-2 zone sizes · Pankaj Raghav <hidden> · 2022-09-12
[PATCH v13 03/13] block: allow blk-zoned devices to have non-power-of-2 zone size · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 03/13] block: allow blk-zoned devices to have non-power-of-2 zone size · Johannes Thumshirn <hidden> · 2022-09-12
[PATCH v13 01/13] block: make bdev_nr_zones and disk_zone_no generic for npo2 zone size · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 01/13] block: make bdev_nr_zones and disk_zone_no generic for npo2 zone size · Johannes Thumshirn <hidden> · 2022-09-12
Re: [PATCH v13 01/13] block: make bdev_nr_zones and disk_zone_no generic for npo2 zone size · Chaitanya Kulkarni <hidden> · 2022-09-14
[PATCH v13 06/13] null_blk: allow zoned devices with non power-of-2 zone sizes · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 06/13] null_blk: allow zoned devices with non power-of-2 zone sizes · Johannes Thumshirn <hidden> · 2022-09-12
Re: [PATCH v13 06/13] null_blk: allow zoned devices with non power-of-2 zone sizes · Chaitanya Kulkarni <hidden> · 2022-09-14
[PATCH v13 02/13] block: rearrange bdev_{is_zoned,zone_sectors,get_queue} helper in blkdev.h · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 02/13] block: rearrange bdev_{is_zoned,zone_sectors,get_queue} helper in blkdev.h · Johannes Thumshirn <hidden> · 2022-09-12
Re: [PATCH v13 02/13] block: rearrange bdev_{is_zoned,zone_sectors,get_queue} helper in blkdev.h · Chaitanya Kulkarni <hidden> · 2022-09-14
[PATCH v13 04/13] nvmet: Allow ZNS target to support non-power_of_2 zone sizes · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 04/13] nvmet: Allow ZNS target to support non-power_of_2 zone sizes · Chaitanya Kulkarni <hidden> · 2022-09-14
[PATCH v13 05/13] nvme: zns: Allow ZNS drives that have non-power_of_2 zone size · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 05/13] nvme: zns: Allow ZNS drives that have non-power_of_2 zone size · Chaitanya Kulkarni <hidden> · 2022-09-14
[PATCH v13 09/13] dm-zone: use generic helpers to calculate offset from zone start · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 09/13] dm-zone: use generic helpers to calculate offset from zone start · Johannes Thumshirn <hidden> · 2022-09-12
[PATCH v13 07/13] zonefs: allow non power of 2 zoned devices · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 07/13] zonefs: allow non power of 2 zoned devices · Johannes Thumshirn <hidden> · 2022-09-12
Re: [PATCH v13 07/13] zonefs: allow non power of 2 zoned devices · Chaitanya Kulkarni <hidden> · 2022-09-14
[PATCH v13 12/13] dm: introduce DM_EMULATED_ZONES target feature flag · Pankaj Raghav <hidden> · 2022-09-12
[PATCH v13 11/13] dm: call dm_zone_endio after the target endio callback for zoned devices · Pankaj Raghav <hidden> · 2022-09-12
[PATCH v13 10/13] dm-table: allow zoned devices with non power-of-2 zone sizes · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 10/13] dm-table: allow zoned devices with non power-of-2 zone sizes · Johannes Thumshirn <hidden> · 2022-09-12
[PATCH v13 08/13] dm-zoned: ensure only power of 2 zone sizes are allowed · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 08/13] dm-zoned: ensure only power of 2 zone sizes are allowed · Johannes Thumshirn <hidden> · 2022-09-12
[PATCH v13 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes · Pankaj Raghav <hidden> · 2022-09-12
Re: [PATCH v13 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes · Mike Snitzer <hidden> · 2022-09-14
Re: [PATCH v13 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes · Pankaj Raghav <hidden> · 2022-09-14
Re: [PATCH v13 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes · Pankaj Raghav <hidden> · 2022-09-16
Re: [PATCH v13 13/13] dm: add power-of-2 target for zoned devices with non power-of-2 zone sizes · Mike Snitzer <hidden> · 2022-09-16

From: Chaitanya Kulkarni <hidden>
Date: 2022-09-14 17:18:02
Also in: dm-devel, linux-nvme, lkml

On 9/12/2022 1:21 AM, Pankaj Raghav wrote:

Convert the power-of-2(po2) based calculation with zone size to be generic
in null_zone_no with optimization for po2 zone sizes.

The nr_zones calculation in null_init_zoned_dev has been replaced with a
division without special handling for po2 zone sizes as this function is
called only during the initialization and will not be invoked in the hot
path.

Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed by: Adam Manzanares [off-list ref]
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Pankaj Raghav <redacted>


Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>

-ck

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