centos man page for snd_pcm_lib_alloc_vmalloc_buffer

SND_PCM_LIB_ALLOC_VM(9) 					   Sound Devices					   SND_PCM_LIB_ALLOC_VM(9)

NAME
       snd_pcm_lib_alloc_vmalloc_buffer - allocate virtual DMA buffer

SYNOPSIS
       int snd_pcm_lib_alloc_vmalloc_buffer(struct snd_pcm_substream * substream, size_t size);

ARGUMENTS
       substream
	   the substream to allocate the buffer to

       size
	   the requested buffer size, in bytes

DESCRIPTION
       Allocates the PCM substream buffer using vmalloc, i.e., the memory is contiguous in kernel virtual space, but not in physical memory. Use
       this if the buffer is accessed by kernel code but not by device DMA.

RETURN
       1 if the buffer was changed, 0 if not changed, or a negative error code.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						   SND_PCM_LIB_ALLOC_VM(9)