.TH "blk_queue_bounce_limit" 9 "blk_queue_bounce_limit" "25 May 1998" "Kernel Hacker's Manual" LINUX
.SH NAME
blk_queue_bounce_limit \-  set bounce buffer limit for queue
.SH SYNOPSIS
.B "void" blk_queue_bounce_limit
.BI "(request_queue_t *" q ","
.BI "u64 " dma_addr ");"
.SH ARGUMENTS
.IP "q" 12
  the request queue for the device
.IP "dma_addr" 12
   bus address limit
.SH "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 \fIpage\fP. By default
the block layer sets this to the highest numbered "low" memory page.