ftrace: make sysprof dependent on x86 for now

that's the only tested platform for now. If there's interest we
can make it generic easily.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

kernel/trace/Kconfig

@@ -77,7 +77,7 @@ config PREEMPT_TRACER
 
 config SYSPROF_TRACER
 	bool "Sysprof Tracer"
-	depends on DEBUG_KERNEL
+	depends on DEBUG_KERNEL && X86
 	select TRACING
 	help
 	  This tracer provides the trace needed by the 'Sysprof' userspace

kernel/trace/trace_selftest.c

@@ -557,11 +557,6 @@ trace_selftest_startup_sysprof(struct tracer *trace, struct trace_array *tr)
 	ret = trace_test_buffer(tr, &count);
 	trace->reset(tr);
 
-	if (!ret && !count) {
-		printk(KERN_CONT ".. no entries found ..");
-		ret = -1;
-	}
-
 	return ret;
 }
 #endif /* CONFIG_SYSPROF_TRACER */