NAME
snd_malloc_pages - allocate pages with the given size
SYNOPSIS
void * snd_malloc_pages (size_t size, gfp_t gfp_flags);
ARGUMENTS
size the size to allocate in bytes
gfp_flags
the allocation conditions, GFP_XXX
DESCRIPTION
Allocates the physically contiguous pages with the given size.
Returns the pointer of the buffer, or NULL if no enoguh memory.