linux-kernel - Re: [PATCH 3/8 linux-next] libnvdimm, namespace: move persistence warning

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Message-ID: <CAPcyv4gU7=gBUfOe3c_EUGKX3xc8bnbBXTSVJ9-MTqbbJ9MksA@mail.gmail.com>
Date:   Fri, 2 Dec 2016 12:51:55 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Fabian Frederick <fabf@...net.be>
Cc:     "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8 linux-next] libnvdimm, namespace: move persistence warning

On Fri, Dec 2, 2016 at 11:20 AM, Fabian Frederick <fabf@...net.be> wrote:
> There's no need to warn on persistence yet as some validity tests
> are on the way.
>
> Signed-off-by: Fabian Frederick <fabf@...net.be>
> ---
>  drivers/nvdimm/pmem.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
> index 822a712..204912c 100644
> --- a/drivers/nvdimm/pmem.c
> +++ b/drivers/nvdimm/pmem.c
> @@ -266,9 +266,6 @@ static int pmem_attach_disk(struct device *dev,
>         dev_set_drvdata(dev, pmem);
>         pmem->phys_addr = res->start;
>         pmem->size = resource_size(res);
> -       if (nvdimm_has_flush(nd_region) < 0)
> -               dev_warn(dev, "unable to guarantee persistence of writes due to unknown flushing capability of the memory region\n");
> -
>         if (!devm_request_mem_region(dev, res->start, resource_size(res),
>                                 dev_name(dev))) {
>                 dev_warn(dev, "could not reserve region %pR\n", res);
> @@ -279,6 +276,9 @@ static int pmem_attach_disk(struct device *dev,
>         if (!q)
>                 return -ENOMEM;
>
> +       if (nvdimm_has_flush(nd_region) < 0)
> +               dev_warn(dev, "unable to guarantee persistence of writes due to unknown flushing capability of the memory region\n");
> +
>         pmem->pfn_flags = PFN_DEV;
>         if (is_nd_pfn(dev)) {
>                 addr = devm_memremap_pages(dev, &pfn_res, &q->q_usage_counter,

With the new sub-section hotplug support I don't think we need this.