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The recent change (*) in the ALSA memalloc core allows us to drop the special vmalloc-specific allocation and page handling. This patch coverts to the common code. (*)1fe7f397cf: ALSA: memalloc: Add vmalloc buffer allocation support7e8edae39f: ALSA: pcm: Handle special page mapping in the default mmap handler Since the driver requires the DMA32 allocation, it passes the specially encoded device to snd_pcm_lib_preallocate_pages(). Link: https://lore.kernel.org/r/20191105151856.10785-16-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>