Re: [kernel-hardening][PATCH v5 1/3] arm: mm: dump: make page table dumping reusable

[Philippe Ombredanne]

Dear Jinbum,

On Thu, Dec 7, 2017 at 11:53 AM, Jinbum Park <jinb.park7@xxxxxxxxx> wrote:
> This patch refactors the arm page table dumping code,
> so multiple tables may be registered with the framework.
>
> This patch refers below commits of arm64.
> (4674fdb9f149 ("arm64: mm: dump: make page table dumping reusable"))
> (4ddb9bf83349 ("arm64: dump: Make ptdump debugfs a separate option"))
>
> Tested-by: Laura Abbott <labbott@xxxxxxxxxx>
> Reviewed-by: Laura Abbott <labbott@xxxxxxxxxx>
> Signed-off-by: Jinbum Park <jinb.park7@xxxxxxxxx>
[]
> diff --git a/arch/arm/include/asm/ptdump.h b/arch/arm/include/asm/ptdump.h
> new file mode 100644
> index 0000000..3a6c0b7
> --- /dev/null
> +++ b/arch/arm/include/asm/ptdump.h
> @@ -0,0 +1,48 @@
> +/*
> + * Copyright (C) 2014 ARM Ltd.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */

Sorry if I am nitpicking, but have you considered replacing this
beautiful piece of fine legalese with the new SPDX ids?
e.g. this:
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2014 ARM Ltd.

Or if this does not work and your includes break something if they are
used in assembly, then this can work out too

> +/* SPDX-License-Identifier: GPL-2.0 */
> +/* Copyright (C) 2014 ARM Ltd. */

See Thomas doc patches, and Greg and Linus comments on these topics.

This is much leaner, is it?
Less legalese comment also means more code and a better, smaller
boilerplate lines/total lines ratio!
Thank you for your kind consideration.

-- 
Cordially
Philippe Ombredanne