linux-kernel - Re: [PATCH 2/2] libnvdimm, namespace: fix btt claim class crash

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Message-ID: <CAPcyv4jf4fdZvUOmC+0RcP_Py-2TNtBLLX3q3GxrqCv7+yvQ=Q@mail.gmail.com>
Date:   Tue, 19 Sep 2017 15:10:40 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     "Saldivar, Maurice A." <maurice.a.saldivar@....com>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "Verma, Vishal L" <vishal.l.verma@...el.com>
Subject: Re: [PATCH 2/2] libnvdimm, namespace: fix btt claim class crash

On Tue, Sep 19, 2017 at 3:06 PM, Saldivar, Maurice A.
<maurice.a.saldivar@....com> wrote:
> I applied this and the kernel patch and was successfully able to
> configure an NVDIMM-N into sector mode. I do have a question about
> specific behavior I observed. Before I was able to configure an NVDIMM
> into any mode from any mode. With these patchs if I go to sector mode
> and try going to memory or dax mode it fails with:
>
> # ndctl create-namespace -f -e namespace0.0 -m memory
>   Error: namespace0.0: sector_size: 4096 not supported
> failed to reconfigure namespace: Invalid argument
>
> but if I go sector->raw-><mode> I can get into other modes fine. Was
> this the intended behavior?
>

Nope, that's another bug. I'll fix that up.