linux-kernel - Re: [PATCH 1/1] device-dax: delete a redundancy check in dev_dax_validate

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Date:   Thu, 17 Dec 2020 13:49:11 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
Cc:     Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] device-dax: delete a redundancy check in dev_dax_validate_align()

On Fri, Nov 20, 2020 at 1:27 AM Leizhen (ThunderTown)
<thunder.leizhen@...wei.com> wrote:
>
>
>
> On 2020/11/20 17:20, Zhen Lei wrote:
> > After we have done the alignment check for the length of each range, the
> > alignment check for dev_dax_size(dev_dax) is no longer needed, because it
> > get the sum of the length of each range.
>
> For example:
> x/M + y/M = (x + y)/M
> If x/M is a integer and y/M is also a integer, then (x + y)/M must be a integer.
>

True... I was going to say that the different error messages might be
useful, but those are debug statements anyways, so I'll apply this.