D30509.diff
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	diff --git a/sys/arm64/linux/linux_machdep.c b/sys/arm64/linux/linux_machdep.c
	--- a/sys/arm64/linux/linux_machdep.c
	+++ b/sys/arm64/linux/linux_machdep.c
	@@ -52,7 +52,6 @@
	LIN_SDT_PROVIDER_DECLARE(LINUX_DTRACE);

	/* DTrace probes */
	-LIN_SDT_PROBE_DEFINE0(machdep, linux_set_upcall, todo);
	LIN_SDT_PROBE_DEFINE0(machdep, linux_mmap2, todo);
	LIN_SDT_PROBE_DEFINE0(machdep, linux_rt_sigsuspend, todo);
	LIN_SDT_PROBE_DEFINE0(machdep, linux_sigaltstack, todo);
	@@ -84,13 +83,19 @@
	return (error);
	}

	-/* LINUXTODO: implement (or deduplicate) arm64 linux_set_upcall */
	int
	linux_set_upcall(struct thread *td, register_t stack)
	{

	- LIN_SDT_PROBE0(machdep, linux_set_upcall, todo);
	- return (EDOOFUS);
	+ if (stack)
	+ td->td_frame->tf_sp = stack;
	+
	+ /*
	+ * The newly created Linux thread returns
	+ * to the user space by the same path that a parent does.
	+ */
	+ td->td_frame->tf_x[0] = 0;
	+ return (0);
	}

	/* LINUXTODO: deduplicate arm64 linux_mmap2 */