From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 30 Aug 2012 17:45:56 +0000
Subject: Re: [PATCH] tpm: fix tpm_acpi sparse warning on different address spaces
Message-Id: <20120830174556.GD20741@mwanda>
List-Id: <kernel-janitors.vger.kernel.org>
References: <20120830143839.GA9589@linux.vnet.ibm.com>
In-Reply-To: <20120830143839.GA9589@linux.vnet.ibm.com>
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To: Kent Yoder <key@linux.vnet.ibm.com>
Cc: James Morris <jmorris@namei.org>, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, tpmdd-devel@lists.sourceforge.net, kernel-janitors@vger.kernel.org, Fengguang Wu <fengguang.wu@intel.com>

On Thu, Aug 30, 2012 at 09:38:41AM -0500, Kent Yoder wrote:
> acpi_os_map_memory expects its return value to be in the __iomem address
> space. Cast it back later when used in a memcpy to avoid the same sparse
> warning there.
> 
> Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>

I can't download linux-next right now but I don't think this is the
correct fix.  I don't think you can memcpy() directly from __iomem.
The static checker is warning about a valid bug which should be
addressed instead of just casted away and silenced.

regards,
dan carpenter