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Date:   Tue, 5 Feb 2019 14:21:36 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Joe Perches <joe@perches.com>
Cc:     Andy Whitcroft <apw@canonical.com>, Rob Herring <robh@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Dan Williams <dan.j.williams@intel.org>
Subject: Re: [PATCH] checkpatch: Verify SPDX comment style
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On Thu, 10 Jan 2019 16:05:11 -0800 Joe Perches <joe@perches.com> wrote:

> Using SPDX commenting style // or /* is specified for
> various file types in Documentation/process/license-rules.rst
> so add an appropriate test for .[chsS] files because many
> proposed file additions and patches do not use the correct style.

Dan's
http://lkml.kernel.org/r/154899811738.3165233.12325692939590944259.stgit@dwillia2-desk3.amr.corp.intel.com
is giving me 

WARNING: Missing or malformed SPDX-License-Identifier tag in line 1
#500: FILE: mm/shuffle.h:1:
+// SPDX-License-Identifier: GPL-2.0

and switching it to /* */ doesn't fix.  This happens with or without
this patch applied.  What to do?