tracing: use newline separator for trace options list

Impact: clean up

Instead of listing the trace options like:

 # cat /debug/tracing/trace_options
print-parent nosym-offset nosym-addr noverbose noraw nohex nobin noblock nostacktrace nosched-tree ftrace_printk noftrace_preempt nobranch annotate nouserstacktrace nosym-userobj

We now list them like:

 # cat /debug/tracing/trace_options
print-parent
nosym-offset
nosym-addr
noverbose
noraw
nohex
nobin
noblock
nostacktrace
nosched-tree
ftrace_printk
noftrace_preempt
nobranch
annotate
nouserstacktrace
nosym-userobj

Signed-off-by: Steven Rostedt <srostedt@redhat.com>

1 files changed, 6 insertions, 7 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 304e02ce39c4..5db7485158df 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2037,7 +2037,7 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
         /* calculate max size */
         for (i = 0; trace_options[i]; i++) {
                 len += strlen(trace_options[i]);
-                len += 3; /* "no" and space */
+                len += 3; /* "no" and newline */
         }
 
         mutex_lock(&trace_types_lock);
@@ -2050,7 +2050,7 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
          */
         for (i = 0; trace_opts[i].name; i++) {
                 len += strlen(trace_opts[i].name);
-                len += 3; /* "no" and space */
+                len += 3; /* "no" and newline */
         }
 
         /* +2 for \n and \0 */
@@ -2062,22 +2062,21 @@ tracing_trace_options_read(struct file *filp, char __user *ubuf,
 
         for (i = 0; trace_options[i]; i++) {
                 if (trace_flags & (1 << i))
-                        r += sprintf(buf + r, "%s ", trace_options[i]);
+                        r += sprintf(buf + r, "%s\n", trace_options[i]);
                 else
-                        r += sprintf(buf + r, "no%s ", trace_options[i]);
+                        r += sprintf(buf + r, "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 ",
+                        r += sprintf(buf + r, "%s\n",
                                 trace_opts[i].name);
                 else
-                        r += sprintf(buf + r, "no%s ",
+                        r += sprintf(buf + r, "no%s\n",
                                 trace_opts[i].name);
         }
         mutex_unlock(&trace_types_lock);
 
-        r += sprintf(buf + r, "\n");
         WARN_ON(r >= len + 2);
 
         r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);