David Howells [off-list ref] wrote:

+#define efi_call_runtime(f, ...)	sys_table_arg->runtime->f(__VA_ARGS__)

Turns out it's not that simple - of course.  runtime->get_variable is just a
void pointer.  The old arm stub was casting it by virtue of assignment to a
function pointer variable.

The x86_64 appears to be doing bypassing all the compile-time type checking by
passing the arguments through an ellipsis and then fixing up the argument list
in the ->call() function.

What I've changed the ARM and ARM64 things to is:

	#define efi_call_runtime(f, ...)	((efi_##f##_t *)sys_table_arg->runtime->f)(__VA_ARGS__)

David