linux-kernel - Re: [PATCH v2 2/3] drm: simpledrm: add fbdev fallback support

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Date:	Mon, 8 Aug 2016 15:38:00 +0200
From:	Noralf Trønnes <noralf@...nnes.org>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:	dri-devel@...ts.freedesktop.org, dh.herrmann@...il.com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] drm: simpledrm: add fbdev fallback support


Den 06.08.2016 00:38, skrev Paul Gortmaker:
> On Fri, Aug 5, 2016 at 11:44 AM, Noralf Trønnes <noralf@...nnes.org> wrote:
>> Create a simple fbdev device during SimpleDRM setup so legacy user-space
>> and fbcon can use it.
>>
>> Original work by David Herrmann.
>>
>> Cc: dh.herrmann@...il.com
>> Signed-off-by: Noralf Trønnes <noralf@...nnes.org>
>> ---
>>
>> Changes from version 1:
>>    No changes
>>
>> Changes from previous version:
>> - Remove the DRM_SIMPLEDRM_FBDEV kconfig option and use DRM_FBDEV_EMULATION
>> - Suspend fbcon/fbdev when the pipeline is enabled, resume in lastclose
>> - Add FBINFO_CAN_FORCE_OUTPUT flag so we get oops'es on the console

<snip>

>> diff --git a/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
>> new file mode 100644
>> index 0000000..b83646b
>> --- /dev/null
>> +++ b/drivers/gpu/drm/simpledrm/simpledrm_fbdev.c
>> @@ -0,0 +1,160 @@
>> +/*
>> + * SimpleDRM firmware framebuffer driver
>> + * Copyright (c) 2012-2014 David Herrmann <dh.herrmann@...il.com>
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License as published by the Free
>> + * Software Foundation; either version 2 of the License, or (at your option)
>> + * any later version.
>> + */
>> +
>> +/*
>> + * fbdev compatibility layer
>> + * We provide a basic fbdev device for the same framebuffer that is used for
>> + * the pseudo CRTC.
>> + */
>> +
>> +#include <linux/console.h>
>> +#include <linux/errno.h>
>> +#include <linux/kernel.h>
>> +#include <linux/mm.h>
>> +#include <linux/module.h>
> You should not need module.h  here since this file is not doing the
> module_init or module_exit or MODULE_ALIAS etc etc.
>
> An empty file with just module.h in it outputs about 750k of goo
> from cpp, so it is best avoided wherever not strictly needed.

I've never thought of superfluous includes in terms of compile time before,
but that makes sense, especially on a large project like this.

Thanks,
Noralf.


> Thanks,
> Paul.
> --
>
>> +#include <linux/string.h>
>> +#include <linux/fb.h>
>> +#include "simpledrm.h"
>> +