[RFC PATCH 3/5] rcupdate_trace: Define rcu_tasks_trace lock guard

[Mathieu Desnoyers <mathieu.desnoyers@efficios.com>]

Define a rcu_tasks_trace lock guard for use by the syscall enter/exit
tracepoints.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Michael Jeanson <mjeanson@efficios.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Yonghong Song <yhs@fb.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: bpf@vger.kernel.org
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Jordan Rife <jrife@google.com>
Cc: linux-trace-kernel@vger.kernel.org
---
 include/linux/rcupdate_trace.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/rcupdate_trace.h b/include/linux/rcupdate_trace.h
index eda493200663..e6c44eb428ab 100644
--- a/include/linux/rcupdate_trace.h
+++ b/include/linux/rcupdate_trace.h
@@ -10,6 +10,7 @@
 
 #include <linux/sched.h>
 #include <linux/rcupdate.h>
+#include <linux/cleanup.h>
 
 extern struct lockdep_map rcu_trace_lock_map;
 
@@ -98,4 +99,8 @@ static inline void rcu_read_lock_trace(void) { BUG(); }
 static inline void rcu_read_unlock_trace(void) { BUG(); }
 #endif /* #ifdef CONFIG_TASKS_TRACE_RCU */
 
+DEFINE_LOCK_GUARD_0(rcu_tasks_trace,
+	rcu_read_lock_trace(),
+	rcu_read_unlock_trace())
+
 #endif /* __LINUX_RCUPDATE_TRACE_H */
-- 
2.39.5