[RFC PATCH 5/5] tracing: Remove cond argument from __DECLARE_TRACE_SYSCALL

[Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>]

Syscall tracepoints do not require a "cond" argument, because they are
meant to be used only for sys_enter and sys_exit instrumentation, which
don't require condition evaluation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Michael Jeanson <mjeanson@xxxxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Yonghong Song <yhs@xxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx>
Cc: bpf@xxxxxxxxxxxxxxx
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Jordan Rife <jrife@xxxxxxxxxx>
Cc: linux-trace-kernel@xxxxxxxxxxxxxxx
---
 include/linux/tracepoint.h | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
index 832f49b56b1f..b2633a72e871 100644
--- a/include/linux/tracepoint.h
+++ b/include/linux/tracepoint.h
@@ -220,7 +220,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
  * site if it is not watching, as it will need to be active when the
  * tracepoint is enabled.
  */
-#define __DECLARE_TRACE_COMMON(name, proto, args, cond, data_proto)	\
+#define __DECLARE_TRACE_COMMON(name, proto, args, data_proto)		\
 	extern int __traceiter_##name(data_proto);			\
 	DECLARE_STATIC_CALL(tp_func_##name, __traceiter_##name);	\
 	extern struct tracepoint __tracepoint_##name;			\
@@ -254,7 +254,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 	}
 
 #define __DECLARE_TRACE(name, proto, args, cond, data_proto)		\
-	__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), cond, PARAMS(data_proto)) \
+	__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \
 	static inline void trace_##name(proto)				\
 	{								\
 		if (static_branch_unlikely(&__tracepoint_##name.key)) { \
@@ -269,18 +269,16 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 		}							\
 	}
 
-#define __DECLARE_TRACE_SYSCALL(name, proto, args, cond, data_proto)	\
-	__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), cond, PARAMS(data_proto)) \
+#define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto)		\
+	__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto)) \
 	static inline void trace_##name(proto)				\
 	{								\
 		might_fault();						\
 		if (static_branch_unlikely(&__tracepoint_##name.key)) {	\
-			if (cond) {					\
-				scoped_guard(rcu_tasks_trace)		\
-					__DO_TRACE_CALL(name, TP_ARGS(args)); \
-			}						\
+			scoped_guard(rcu_tasks_trace)			\
+				__DO_TRACE_CALL(name, TP_ARGS(args));	\
 		}							\
-		if (IS_ENABLED(CONFIG_LOCKDEP) && (cond)) {		\
+		if (IS_ENABLED(CONFIG_LOCKDEP)) {			\
 			WARN_ONCE(!rcu_is_watching(),			\
 				  "RCU not watching for tracepoint");	\
 		}							\
@@ -363,7 +361,7 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 
 
 #else /* !TRACEPOINTS_ENABLED */
-#define __DECLARE_TRACE(name, proto, args, cond, data_proto)		\
+#define __DECLARE_TRACE_COMMON(name, proto, args, data_proto)		\
 	static inline void trace_##name(proto)				\
 	{ }								\
 	static inline int						\
@@ -387,7 +385,11 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 		return false;						\
 	}
 
-#define __DECLARE_TRACE_SYSCALL	__DECLARE_TRACE
+#define __DECLARE_TRACE(name, proto, args, cond, data_proto)		\
+	__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto))
+
+#define __DECLARE_TRACE_SYSCALL(name, proto, args, data_proto)		\
+	__DECLARE_TRACE_COMMON(name, PARAMS(proto), PARAMS(args), PARAMS(data_proto))
 
 #define DEFINE_TRACE_FN(name, reg, unreg, proto, args)
 #define DEFINE_TRACE_SYSCALL(name, reg, unreg, proto, args)
@@ -453,7 +455,6 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p)
 
 #define DECLARE_TRACE_SYSCALL(name, proto, args)			\
 	__DECLARE_TRACE_SYSCALL(name, PARAMS(proto), PARAMS(args),	\
-				cpu_online(raw_smp_processor_id()),	\
 				PARAMS(void *__data, proto))
 
 #define TRACE_EVENT_FLAGS(event, flag)
-- 
2.39.5