linux-kernel - Re: [PATCH v3 1/3] pmem: only set QUEUE_FLAG

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Date:   Tue, 26 Jun 2018 11:52:49 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     Toshi Kani <toshi.kani@....com>, Mike Snitzer <snitzer@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        linux-xfs <linux-xfs@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] pmem: only set QUEUE_FLAG_DAX for fsdax mode

On Tue, Jun 26, 2018 at 10:59 AM, Ross Zwisler
<ross.zwisler@...ux.intel.com> wrote:
> QUEUE_FLAG_DAX is an indication that a given block device supports
> filesystem DAX and should not be set for PMEM namespaces which are in "raw"
> or "sector" modes.  These namespaces lack struct page and are prevented
> from participating in filesystem DAX.
>
> Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
> Suggested-by: Mike Snitzer <snitzer@...hat.com>
> Cc: stable@...r.kernel.org

Why is this cc: stable? What is the user visible impact of this change
especially given the requirement to validate QUEUE_FLAG_DAX with
bdev_dax_supported()? Patch looks good, but it's just a cosmetic fixup
afaics.