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

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Date:	Thu, 5 Mar 2009 08:59:40 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Olaf Hering <olaf@...fle.de>
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

On Thu, 5 Mar 2009, Olaf Hering wrote:
> 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.

OK.

> >+obj-$(CONFIG_PS3_VRAM)		+= ps3vram_ng.o
> 
> Please give the driver the obvious name "ps3vram", that way upgrading will be
> smooth.

Sure, as I said:

| I'll submit a patch to remove the MTD
| ps3vram and add the new driver as ps3vram (instead of ps3vram-ng).

> I see our old mtddriver does not have modalias support for autoloading.

You forgot to backport commit 0a2d15b928e0b1673d4ed5f48d95af211b6fcc06
("mtd/ps3vram: Add modalias support to the ps3vram driver") to the openSuSE
tree?

> Hopefully the new driver has this feature.

Yes, it has.

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
Fax:      +32 (0)2 700 8622
E-mail:   Geert.Uytterhoeven@...ycom.com
Internet: http://www.sony-europe.com/

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