linux-kernel - [for-next][PATCH] tracing: Add rcu annotation for syscall trace descriptors

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Date:	Mon, 11 Nov 2013 17:15:46 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	kbuild test robot <fengguang.wu@...el.com>
Subject: [for-next][PATCH] tracing: Add rcu annotation for syscall trace
 descriptors


  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
for-next

Head SHA1: 3a81a5210b7d33bb6d836b4c4952a54166a336f3


Steven Rostedt (Red Hat) (1):
      tracing: Add rcu annotation for syscall trace descriptors

----
 kernel/trace/trace.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---------------------------
commit 3a81a5210b7d33bb6d836b4c4952a54166a336f3
Author: Steven Rostedt (Red Hat) <rostedt@...dmis.org>
Date:   Mon Nov 11 11:47:06 2013 -0500

    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@...el.com>
    Signed-off-by: Steven Rostedt <rostedt@...dmis.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;
--
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