tracing: Use seq file for trace_options

Code simplification for reading trace_options.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
LKML-reference: <4B1DC4EF.3090106@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 88bd9ae..a6c41cc 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2316,67 +2316,32 @@ static const struct file_operations tracing_cpumask_fops = {
        .write          = tracing_cpumask_write,
 };
 
-static ssize_t
-tracing_trace_options_read(struct file *filp, char __user *ubuf,
-                      size_t cnt, loff_t *ppos)
+static int tracing_trace_options_show(struct seq_file *m, void *v)
 {
        struct tracer_opt *trace_opts;
        u32 tracer_flags;
-       int len = 0;
-       char *buf;
-       int r = 0;
        int i;
 
-
-       /* calculate max size */
-       for (i = 0; trace_options[i]; i++) {
-               len += strlen(trace_options[i]);
-               len += 3; /* "no" and newline */
-       }
-
        mutex_lock(&trace_types_lock);
        tracer_flags = current_trace->flags->val;
        trace_opts = current_trace->flags->opts;
 
-       /*
-        * Increase the size with names of options specific
-        * of the current tracer.
-        */
-       for (i = 0; trace_opts[i].name; i++) {
-               len += strlen(trace_opts[i].name);
-               len += 3; /* "no" and newline */
-       }
-
-       /* +1 for \0 */
-       buf = kmalloc(len + 1, GFP_KERNEL);
-       if (!buf) {
-               mutex_unlock(&trace_types_lock);
-               return -ENOMEM;
-       }
-
        for (i = 0; trace_options[i]; i++) {
                if (trace_flags & (1 << i))
-                       r += sprintf(buf + r, "%s\n", trace_options[i]);
+                       seq_printf(m, "%s\n", trace_options[i]);
                else
-                       r += sprintf(buf + r, "no%s\n", trace_options[i]);
+                       seq_printf(m, "no%s\n", trace_options[i]);
        }
 
        for (i = 0; trace_opts[i].name; i++) {
                if (tracer_flags & trace_opts[i].bit)
-                       r += sprintf(buf + r, "%s\n",
-                               trace_opts[i].name);
+                       seq_printf(m, "%s\n", trace_opts[i].name);
                else
-                       r += sprintf(buf + r, "no%s\n",
-                               trace_opts[i].name);
+                       seq_printf(m, "no%s\n", trace_opts[i].name);
        }
        mutex_unlock(&trace_types_lock);
 
-       WARN_ON(r >= len + 1);
-
-       r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
-
-       kfree(buf);
-       return r;
+       return 0;
 }
 
 /* Try to assign a tracer specific option */
@@ -2471,9 +2436,18 @@ tracing_trace_options_write(struct file *filp, const char __user *ubuf,
        return cnt;
 }
 
+static int tracing_trace_options_open(struct inode *inode, struct file *file)
+{
+       if (tracing_disabled)
+               return -ENODEV;
+       return single_open(file, tracing_trace_options_show, NULL);
+}
+
 static const struct file_operations tracing_iter_fops = {
-       .open           = tracing_open_generic,
-       .read           = tracing_trace_options_read,
+       .open           = tracing_trace_options_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
        .write          = tracing_trace_options_write,
 };