linux-kernel - Re: [PATCH/RFC] ps3/block: Add ps3vram-ng driver for accessing video RAM as block device

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Message-Id: <AA44F8E7-5FBC-4378-A86D-C094ECABD625@aepfle.de>
Date:	Thu, 5 Mar 2009 08:17:24 +0100
From:	Olaf Hering <olaf@...fle.de>
To:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jens Axboe <axboe@...nel.dk>, Jim Paris <jim@...n.com>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Linux/PPC Development <linuxppc-dev@...abs.org>,
	linux-mtd@...ts.infradead.org,
	Vivien Chappelier <vivien.chappelier@...e.fr>,
	David Woodhouse <dwmw2@...radead.org>,
	Cell Broadband Engine OSS Development 
	<cbe-oss-dev@...abs.org>
Subject: Re: [PATCH/RFC] ps3/block: Add ps3vram-ng driver for accessing video RAM as block device

Am 04.03.2009 um 14:57 schrieb Geert Uytterhoeven:

> Ideally, we think it would be best if the existing MTD-based ps3vram  
> driver
> would be replaced by the new block-based ps3vram driver before  
> 2.6.29 is
> released. This would relieve the burden of supporting two different  
> swap space
> schemes on PS3 (swap on /dev/mtdblock0 vs. /dev/ps3vram) from the  
> distro
> maintainer's shoulders, as in that case there would never have been  
> a stable
> kernel version containing the MTD-based ps3vram driver.

openSuSE already ships with the ps3vram driver since a two releases.
A simple name based udev rule could symlink ps3vram to mtdblock0, so  
an upgrade
will not break existing setups.

> +obj-$(CONFIG_PS3_VRAM)		+= ps3vram_ng.o

Please give the driver the obvious name "ps3vram", that way upgrading  
will be smooth.

I see our old mtddriver does not have modalias support for autoloading.
Hopefully the new driver has this feature.

Olaf
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