From: Malahal Naineni <malahal@us.ibm.com>
Date: Fri, 24 Sep 2010 18:25:49 +0000 (+0200)
Subject: block: set the bounce_pfn to the actual DMA limit rather than to max memory
X-Git-Tag: v2.6.37-rc1~168^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c49825facfd4969585224a896a5e717f88450cad;p=pandora-kernel.git

block: set the bounce_pfn to the actual DMA limit rather than to max memory

The bounce_pfn of the request queue in 64 bit systems is set to the
current max_low_pfn. Adding more memory later makes this incorrect.
Memory allocated beyond this boot time max_low_pfn appear to require
bounce buffers (bounce buffers are actually not allocated but used in
calculating segments that may result in "over max segments limit"
errors).

Signed-off-by: Malahal Naineni <malahal@us.ibm.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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