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efb012b361
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>