1 files changed, 16 insertions, 5 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a0174a40c563..9d28476a9851 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -30,6 +30,7 @@
 #include <linux/percpu.h>
 #include <linux/splice.h>
 #include <linux/kdebug.h>
+#include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>
@@ -147,8 +148,7 @@ static int __init set_ftrace_dump_on_oops(char *str)
 }
 __setup("ftrace_dump_on_oops", set_ftrace_dump_on_oops);
 
-long
-ns2usecs(cycle_t nsec)
+unsigned long long ns2usecs(cycle_t nsec)
 {
         nsec += 500;
         do_div(nsec, 1000);
@@ -1632,7 +1632,11 @@ static void test_cpu_buff_start(struct trace_iterator *iter)
                 return;
 
         cpumask_set_cpu(iter->cpu, iter->started);
-        trace_seq_printf(s, "##### CPU %u buffer started ####\n", iter->cpu);
+
+        /* Don't print started cpu buffer for the first entry of the trace */
+        if (iter->idx > 1)
+                trace_seq_printf(s, "##### CPU %u buffer started ####\n",
+                                iter->cpu);
 }
 
 static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
@@ -1867,6 +1871,11 @@ __tracing_open(struct inode *inode, struct file *file)
         if (current_trace)
                 *iter->trace = *current_trace;
 
+        if (!alloc_cpumask_var(&iter->started, GFP_KERNEL))
+                goto fail;
+
+        cpumask_clear(iter->started);
+
         if (current_trace && current_trace->print_max)
                 iter->tr = &max_tr;
         else
@@ -1917,6 +1926,7 @@ __tracing_open(struct inode *inode, struct file *file)
                 if (iter->buffer_iter[cpu])
                         ring_buffer_read_finish(iter->buffer_iter[cpu]);
         }
+        free_cpumask_var(iter->started);
  fail:
         mutex_unlock(&trace_types_lock);
         kfree(iter->trace);
@@ -1960,6 +1970,7 @@ static int tracing_release(struct inode *inode, struct file *file)
 
         seq_release(inode, file);
         mutex_destroy(&iter->mutex);
+        free_cpumask_var(iter->started);
         kfree(iter->trace);
         kfree(iter);
         return 0;
@@ -2358,9 +2369,9 @@ static const char readme_msg[] =
         "# mkdir /debug\n"
         "# mount -t debugfs nodev /debug\n\n"
         "# cat /debug/tracing/available_tracers\n"
-        "wakeup preemptirqsoff preemptoff irqsoff ftrace sched_switch none\n\n"
+        "wakeup preemptirqsoff preemptoff irqsoff function sched_switch nop\n\n"
         "# cat /debug/tracing/current_tracer\n"
-        "none\n"
+        "nop\n"
         "# echo sched_switch > /debug/tracing/current_tracer\n"
         "# cat /debug/tracing/current_tracer\n"
         "sched_switch\n"