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Date:   Fri, 9 Sep 2022 06:00:13 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     David Sterba <dsterba@suse.cz>
Cc:     Sweet Tea Dorminy <sweettea-kernel@dorminy.me>,
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        linux-btrfs@vger.kernel.org, kernel-team@fb.com,
        Omar Sandoval <osandov@osandov.com>, linux-spdx@vger.kernel.org
Subject: Re: [PATCH v2 10/20] btrfs: factor a fscrypt_name matching method
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On Fri, Sep 09, 2022 at 12:15:21PM +0200, David Sterba wrote:
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2020 Facebook
> > + */
> 
> Please use only SPDX in new files
> 
> https://btrfs.wiki.kernel.org/index.php/Developer%27s_FAQ#Copyright_notices_in_files.2C_SPDX

The wiki is incorrect.  The SPDX tag deals with the licensing tags
only.  It is not a replacement for the copyright notice in any way, and
having been involved with Copyright enforcement I can tell you that
at least in some jurisdictions Copytight notices absolutely do matter.