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

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Date:	Tue, 12 Feb 2008 18:07:15 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jeff Garzik <jeff@...zik.org>
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>,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH #upstream] libata: implement libata.force module parameter

Jeff Garzik wrote:
> 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.

Jeff, this no longer causes build failure whether libata is configured
built-in or as a module.  I have no idea what's going on but there
doesn't seem to be a proper solution on the horizon yet.  I think we can
go ahead and commit this one and convert it to __initdataconst when it
becomes available.

Thanks.

-- 
tejun
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