linux-kernel - Re: [PATCH 05/14] lib: Add I/O map cache implementation

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Message-ID: <20130116115225.GA15873@avionic-0098.adnet.avionic-design.de>
Date:	Wed, 16 Jan 2013 12:52:25 +0100
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Arnd Bergmann <arnd@...db.de>,
	Stephen Warren <swarren@...dotorg.org>,
	linux-tegra@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Andrew Murray <andrew.murray@....com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 05/14] lib: Add I/O map cache implementation

On Wed, Jan 16, 2013 at 11:25:56AM +0000, Russell King - ARM Linux wrote:
> On Wed, Jan 16, 2013 at 11:18:22AM +0100, Thierry Reding wrote:
> > 		err = ioremap_page_range(virt, virt + SZ_64K - 1, phys,
> 
> Why -1 here?

Right, I forgot that end in these functions always means one byte after
the end. Removing the -1 seems to get past the remapping at least.
Reading the configuration space through the mapping doesn't though. I'll
investigate some more.

Thanks for pointing this out Russell.

Thierry

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