[PATCH 1/2] cobalt/trace: dovetail: remove TODO and return -ENOSYS for unportable features

[Hongzhan Chen via Xenomai]

Some of the features are unportable because ftrace does not
provide equivalent functionality to the ipipe tracer (namely double
buffering so that you can continue to record in flight-recorder mode
while a previous recording remains available).

Signed-off-by: Hongzhan Chen <hongzhan.c...@intel.com>

diff --git a/include/cobalt/kernel/dovetail/pipeline/trace.h 
b/include/cobalt/kernel/dovetail/pipeline/trace.h
index 479191e0e..7147ab183 100644
--- a/include/cobalt/kernel/dovetail/pipeline/trace.h
+++ b/include/cobalt/kernel/dovetail/pipeline/trace.h
@@ -27,20 +27,17 @@
 
 static inline int xntrace_max_begin(unsigned long v)
 {
-       TODO();
-       return 0;
+       return -ENOSYS;
 }
 
 static inline int xntrace_max_end(unsigned long v)
 {
-       TODO();
-       return 0;
+       return -ENOSYS;
 }
 
 static inline int xntrace_max_reset(void)
 {
-       TODO();
-       return 0;
+       return -ENOSYS;
 }
 
 static inline int xntrace_user_start(void)
-- 
2.17.1