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charset="utf-8" It's not clear to me why only the frontend has been tristate. Switch the backend to be, too. Signed-off-by: Jan Beulich Acked-by: Stefano Stabellini --- a/drivers/xen/Kconfig +++ b/drivers/xen/Kconfig @@ -214,7 +214,7 @@ config XEN_PVCALLS_FRONTEND implements them. =20 config XEN_PVCALLS_BACKEND - bool "XEN PV Calls backend driver" + tristate "XEN PV Calls backend driver" depends on INET && XEN && XEN_BACKEND help Experimental backend for the Xen PV Calls protocol