linux-kernel - RE: [PATCH] nfit: Collect shutdown status for NVDIMM_FAMILY

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Message-ID: <PU1P153MB01696669DA81578B11734765BF900@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM>
Date:   Wed, 30 Jan 2019 20:02:36 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        Josh Poulson <jopoulso@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "driverdev-devel@...uxdriverproject.org" 
        <driverdev-devel@...uxdriverproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: RE: [PATCH] nfit: Collect shutdown status for NVDIMM_FAMILY_HYPERV

> From: Greg KH <gregkh@...uxfoundation.org>
> Sent: Wednesday, January 30, 2019 11:38 AM
> 
> On Wed, Jan 30, 2019 at 06:48:40PM +0000, Dexuan Cui wrote:
> >
> > Let's expose the info to the userspace (e.g. ntctl) via sysfs.
> 
> If you add a new sysfs file, you need to add a new Documentation/ABI/
> update as well :(

It's an existing sysfs node, which was originally added by Dan in Sep 2018: 
/sys/bus/nd/devices/nmem0/nfit/dirty_shutdown. 

Before this patch, the node doesn't appear when Linux runs on Hyper-V,
and with this patch, the node can appear now.

However, indeed, the node and the other related nodes have not been
documented in Documentation/ABI/testing/sysfs-bus-nfit yet.

I suppose Dan would add that?

Thanks,
-- Dexuan