tracing: Do note expose stack_trace_filter without DYNAMIC_FTRACE

The "stack_trace_filter" file only makes sense if DYNAMIC_FTRACE is
configured in. If it is not, then the user can not filter any functions.

Not only that, the open function causes warnings when DYNAMIC_FTRACE is not
set.

Link: http://lkml.kernel.org/r/20170710110521.600806-1-arnd@arndb.de

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
index b4a751e8f9d6..a4df67cbc711 100644
--- a/kernel/trace/trace_stack.c
+++ b/kernel/trace/trace_stack.c
@@ -406,6 +406,8 @@ static const struct file_operations stack_trace_fops = {
         .release        = seq_release,
 };
 
+#ifdef CONFIG_DYNAMIC_FTRACE
+
 static int
 stack_trace_filter_open(struct inode *inode, struct file *file)
 {
@@ -423,6 +425,8 @@ static const struct file_operations stack_trace_filter_fops = {
         .release = ftrace_regex_release,
 };
 
+#endif /* CONFIG_DYNAMIC_FTRACE */
+
 int
 stack_trace_sysctl(struct ctl_table *table, int write,
                    void __user *buffer, size_t *lenp,
@@ -477,8 +481,10 @@ static __init int stack_trace_init(void)
         trace_create_file("stack_trace", 0444, d_tracer,
                         NULL, &stack_trace_fops);
 
+#ifdef CONFIG_DYNAMIC_FTRACE
         trace_create_file("stack_trace_filter", 0444, d_tracer,
                           &trace_ops, &stack_trace_filter_fops);
+#endif
 
         if (stack_trace_filter_buf[0])
                 ftrace_set_early_filter(&trace_ops, stack_trace_filter_buf, 1);