Provided by: linux-doc-2.6.15_2.6.15-23.39_all bug

NAME

       blk_queue_bounce_limit - set bounce buffer limit for queue

SYNOPSIS

       void blk_queue_bounce_limit  (request_queue_t * q, u64 dma_addr);

ARGUMENTS

       q      the request queue for the device

       dma_addr
              bus address limit

DESCRIPTION

       Different  hardware can have different requirements as to what pages it
       can   do   I/O   directly   to.   A   low   level   driver   can   call
       blk_queue_bounce_limit  to  have lower memory pages allocated as bounce
       buffers for doing I/O to pages residing  above  page.  By  default  the
       block layer sets this to the highest numbered ‘‘low’’ memory page.