On Sat, Apr 13, 2019 at 06:30:52PM +0200, Heinrich Schuchardt wrote: > This patch avoids > ERROR: "__sync_icache_dcache" [drivers/xen/xen-privcmd.ko] undefined! > observed when compiling v4.19.34. > > The xen-privcmd driver, which can be modular, calls set_pte_at() > which in turn may call __sync_icache_dcache(). Maybe that really is a sign that it should not be modular..