linux-kernel - Re: [PATCH #upstream] libata: implement libata.force module parameter

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Date:	Fri, 01 Feb 2008 12:28:35 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <htejun@...il.com>
CC:	IDE/ATA development list <linux-ide@...r.kernel.org>,
	Mark Lord <liml@....ca>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Sam Ravnborg <sam@...nborg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH #upstream] libata: implement libata.force module parameter

Tejun Heo wrote:
> This patch implements libata.force module parameter which can
> selectively override ATA port, link and device configurations
> including cable type, SATA PHY SPD limit, transfer mode and NCQ.
> 
> For example, you can say "use 1.5Gbps for all fan-out ports attached
> to the second port but allow 3.0Gbps for the PMP device itself, oh,
> the device attached to the third fan-out port chokes on NCQ and
> shouldn't go over UDMA4" by the following.
> 
>  libata.force=2:1.5g,2.15:3.0g,2.03:noncq,udma4
> 
> Signed-off-by: Tejun Heo <htejun@...il.com>
> ---
> I guess it's about time we add something like this.  More than
> anything else this should help debugging and can serve as a last
> resort to work around problems.
> 
> Thanks.
> 
>  Documentation/kernel-parameters.txt |   35 +++
>  drivers/ata/libata-core.c           |  375 +++++++++++++++++++++++++++++++++++-
>  drivers/ata/libata-eh.c             |    8 
>  drivers/ata/libata.h                |    1 
>  4 files changed, 415 insertions(+), 4 deletions(-)

ACK, but it breaks the build due to section type conflicts:

drivers/ata/libata-core.c:108: error: ata_force_param_buf causes a 
section type conflict

Given that the data is marked __initdata and the code is marked __init, 
I cannot see the problem.

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