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ATM switched virtual circuits (SVCs) are set up and torn down by a user-space signaling daemon (atmsigd) which the kernel talks to over a dedicated "sigd" socket: the kernel marshals Q.2931-style requests (as_connect, as_listen, as_accept, as_close, ...) to the daemon and applies the results to PF_ATMSVC sockets. This is the machinery behind classical SVC use and was the foundation for LANE / MPOA, all of which have been removed. DSL deployments do not use any of this. PPPoATM and BR2684 run over permanent virtual circuits (PF_ATMPVC) with a statically configured VPI/VCI; no atmsigd, no Q.2931. Neither remaining ATM driver (solos-pci, the USB DSL modems) is reachable through the SVC path. Remove the SVC socket family and the signaling interface: - delete net/atm/svc.c, net/atm/signaling.c and signaling.h - drop atmsvc_init()/atmsvc_exit() and the PF_ATMSVC registration and module alias - drop the ATMSIGD_CTRL ioctl (sigd_attach) and the /proc/net/atm/svc file - fold the SVC branch out of atm_change_qos(); all sockets are PVCs now The obsolete ATM_SETSC ioctl stub is left in place (it already just warns and returns 0), as is the struct atm_vcc SVC bookkeeping shared with the queueing layer. Link: https://patch.msgid.link/20260615194416.752559-6-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>