original_kernel/sound/xen/Kconfig

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# ALSA Xen drivers
config SND_XEN_FRONTEND
tristate "Xen para-virtualized sound frontend driver"
depends on XEN
select SND_PCM
select XEN_XENBUS_FRONTEND
select XEN_FRONT_PGDIR_SHBUF
help
Choose this option if you want to enable a para-virtualized
frontend sound driver for Xen guest OSes.