kfifo_dma_out_prepare man page on OpenSuSE

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KFIFO_DMA_OUT_PREPAR(9)		  FIFO Buffer	       KFIFO_DMA_OUT_PREPAR(9)

NAME
       kfifo_dma_out_prepare - setup a scatterlist for DMA output

SYNOPSIS
       kfifo_dma_out_prepare(fifo, sgl, nents, len);

ARGUMENTS
       fifo
	   address of the fifo to be used

       sgl
	   pointer to the scatterlist array

       nents
	   number of entries in the scatterlist array

       len
	   number of elements to transfer

DESCRIPTION
       This macro fills a scatterlist for DMA output which at most len bytes
       to transfer. It returns the number entries in the scatterlist array. A
       zero means there is no space available and the scatterlist is not
       filled.

       Note that with only one concurrent reader and one concurrent writer,
       you don't need extra locking to use these macros.

COPYRIGHT
Kernel Hackers Manual 3.11	 November 2013	       KFIFO_DMA_OUT_PREPAR(9)
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