[PATCH 1/2] tracing: Add __rcu to enter/exit_syscall_files

[Tom Zanussi]

Add __rcu annotation to the contents of enter/exit_syscall_files to
signify that they're protected by rcu and to silence the following
sparse warnings when CONFIG_SPARSE_RCU_POINTER=y:

kernel/trace/trace_syscalls.c:320:23: error: incompatible types in
  comparison expression (different address spaces)
kernel/trace/trace_syscalls.c:368:23: error: incompatible types in
  comparison expression (different address spaces)

Signed-off-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
---
 kernel/trace/trace.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

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;
-- 
1.8.3.1

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