Merge branch 'tracing/urgent' into tracing/ftrace

[GitHub/LineageOS/android_kernel_samsung_universal7580.git] / kernel / trace / trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 2a81decf99bc604fc75b6f3aa5b6a5592b61894c..32653c8c6e26102f8055a1df57456b530e692ddd 100644 (file)
--- 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);
@@ -1623,7 +1623,11 @@ 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)
@@ -1858,6 +1862,11 @@ __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
@@ -1908,6 +1917,7 @@ __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);
@@ -1951,6 +1961,7 @@ 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;
@@ -2349,9 +2360,9 @@ 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"