Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

[cascardo/linux.git] / kernel / trace / trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2198a63..87fb980 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -100,8 +100,6 @@ static DEFINE_PER_CPU(bool, trace_cmdline_save);
  */
 static int tracing_disabled = 1;
 
-DEFINE_PER_CPU(int, ftrace_cpu_disabled);
-
 cpumask_var_t __read_mostly    tracing_buffer_mask;
 
 /*
@@ -1775,10 +1773,6 @@ trace_function(struct trace_array *tr,
        struct ring_buffer_event *event;
        struct ftrace_entry *entry;
 
-       /* If we are reading the ring buffer, don't trace */
-       if (unlikely(__this_cpu_read(ftrace_cpu_disabled)))
-               return;
-
        event = trace_buffer_lock_reserve(buffer, TRACE_FN, sizeof(*entry),
                                          flags, pc);
        if (!event)
@@ -4554,6 +4548,8 @@ out:
        return ret;
 }
 
+#ifdef CONFIG_TRACER_MAX_TRACE
+
 static ssize_t
 tracing_max_lat_read(struct file *filp, char __user *ubuf,
                     size_t cnt, loff_t *ppos)
@@ -4568,6 +4564,8 @@ tracing_max_lat_write(struct file *filp, const char __user *ubuf,
        return tracing_nsecs_write(filp->private_data, ubuf, cnt, ppos);
 }
 
+#endif
+
 static int tracing_open_pipe(struct inode *inode, struct file *filp)
 {
        struct trace_array *tr = inode->i_private;
@@ -5469,12 +5467,14 @@ static const struct file_operations tracing_thresh_fops = {
        .llseek         = generic_file_llseek,
 };
 
+#ifdef CONFIG_TRACER_MAX_TRACE
 static const struct file_operations tracing_max_lat_fops = {
        .open           = tracing_open_generic,
        .read           = tracing_max_lat_read,
        .write          = tracing_max_lat_write,
        .llseek         = generic_file_llseek,
 };
+#endif
 
 static const struct file_operations set_tracer_fops = {
        .open           = tracing_open_generic,
@@ -6847,7 +6847,9 @@ struct dentry *tracing_init_dentry(void)
        if (tr->dir)
                return NULL;
 
-       if (WARN_ON(!debugfs_initialized()))
+       if (WARN_ON(!tracefs_initialized()) ||
+               (IS_ENABLED(CONFIG_DEBUG_FS) &&
+                WARN_ON(!debugfs_initialized())))
                return ERR_PTR(-ENODEV);
 
        /*