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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.
(*) 1fe7f397: ALSA: memalloc: Add vmalloc buffer allocation
                  support
    7e8edae3

: ALSA: pcm: Handle special page mapping in the
                  default mmap handler
Acked-by: Mark Brown <broonie@kernel.org>
Acked-by: Curtis Malainey <cujomalainey@chromium.org>
Link: https://lore.kernel.org/r/20191108094641.20086-7-tiwai@suse.de

Signed-off-by: Takashi Iwai <tiwai@suse.de>