linux-kernel - Re: [PATCH] nvmet: Reorder fields in 'struct nvmet

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Message-ID: <00537d0c-159c-a802-6ed8-209109a69660@nvidia.com>
Date:   Thu, 27 Apr 2023 23:07:43 +0000
From:   Chaitanya Kulkarni <chaitanyak@...dia.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sagi Grimberg <sagi@...mberg.me>,
        Christoph Hellwig <hch@....de>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
Subject: Re: [PATCH] nvmet: Reorder fields in 'struct nvmet_ns'

On 4/27/23 16:01, Jens Axboe wrote:
> On 4/27/23 4:59?PM, Chaitanya Kulkarni wrote:
>> On 4/27/23 12:47, Christophe JAILLET wrote:
>>> Group some variables based on their sizes to reduce holes.
>>> On x86_64, this shrinks the size of 'struct nvmet_ns' from 520 to 512
>>> bytes.
>>>
>> Although this looks good, we at least need to document what
>> happens on other arch(s) which are not mentioned in the
>> commit log ? is there a possibility that someone might come
>> up with the contradictory data in future for the arch(s) which
>> arch that are not mentioned here ?
> The change is certainly not going to make things _worse_ for any arch,
> so I think that's somewhat of a pointless exercise and an unreasonable
> ask for something that makes sense on 64-bit arm/x86 and saves half the
> space.
>

disregard my comment, looks good...

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

-ck