linux-kernel - RE: [PATCH] acpi/nfit: Require opt-in for read-only label configurations

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Message-ID: <PU1P153MB0169B2995B66A08CEA44458DBF6D0@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM>
Date:   Mon, 4 Feb 2019 05:45:57 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: RE: [PATCH] acpi/nfit: Require opt-in for read-only label
 configurations

> From: Dan Williams <dan.j.williams@...el.com>
> Sent: Sunday, February 3, 2019 11:29 AM
> ...
> Recent fixes to command handling enabled Linux to read label
> configurations that it could not before. Unfortunately that means that
> configurations that were operating in label-less mode will be broken as
> the kernel ignores the existing namespace configuration and tries to
> honor the new found labels.
> 
> Fortunately this seems limited to a case where Linux can quirk the
> behavior and maintain the existing label-less semantics by default.
> When the platform does not emit an _LSW method, disable all label access
> methods. Provide a 'force_labels' module parameter to allow read-only
> label operation.
> 
> Fixes: 11189c1089da ("acpi/nfit: Fix command-supported detection")
> Reported-by: Dexuan Cui <decui@...rosoft.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>

Hi Dan,
Thanks for the patch and all the detailed explanation! With this patch,
the "fsdax" namespace can be properly detected now!

Thanks,
-- Dexuan