tree e8c0027db29ec3898d835ca0fa6efab93d86b9bd
parent 260a67a9e534f0c7d49ddd6451833d54ba39ac81
author Malahal Naineni <malahal@us.ibm.com> 1285937127 +0200
committer Jens Axboe <jaxboe@fusionio.com> 1285937127 +0200

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>