linux-kernel - Re: [PATCH] libata: add warning about possible HPA compatibility issue

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Message-ID: <20090525233814.4cb8b1c2@lxorguk.ukuu.org.uk>
Date:	Mon, 25 May 2009 23:38:14 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Jeff Garzik <jgarzik@...ox.com>, Jacob <fun2program8@...oo.com>,
	Christopher Hogan <chris.c.hogan@...il.com>,
	Robert Hancock <hancockrwd@...il.com>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libata: add warning about possible HPA compatibility
 issue

> > NAK - this is extremely misleading and will just randomly terrify users,
> > who may then set the paramater and corrupt things like BIOS save areas.
> 
> Please propose better description.

As was discussed before

Tejun has a patch in the queue which exposes the HPA and real sizes to
the OS

Libata can support revalidating a disc

Once the HPA/Real size data is there the tools can be tuned for this and
a sysfs node added to switch hpa on/off per disc. At that point this can
be done by the user space intelligently.

The fact this is a user parameter is itself a problem.

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