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 (file)
--- 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;