From: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
Date: Mon, 11 Nov 2013 16:47:06 +0000 (-0500)
Subject: tracing: Add rcu annotation for syscall trace descriptors
X-Git-Tag: upstream/snapshot3+hdmi~3946^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=3a81a5210b7d33bb6d836b4c4952a54166a336f3;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

tracing: Add rcu annotation for syscall trace descriptors

sparse complains about the enter/exit_sysycall_files[] variables being
dereferenced with rcu_dereference_sched(). The fields need to be
annotated with __rcu.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 11a04d6..7ca1993 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -192,8 +192,8 @@ struct trace_array {
 #ifdef CONFIG_FTRACE_SYSCALLS
 	int			sys_refcount_enter;
 	int			sys_refcount_exit;
-	struct ftrace_event_file *enter_syscall_files[NR_syscalls];
-	struct ftrace_event_file *exit_syscall_files[NR_syscalls];
+	struct ftrace_event_file __rcu *enter_syscall_files[NR_syscalls];
+	struct ftrace_event_file __rcu *exit_syscall_files[NR_syscalls];
 #endif
 	int			stop_count;
 	int			clock_id;