1 files changed, 121 insertions, 6 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 5c75deeefe30..fd52a19dd172 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -339,6 +339,112 @@ static struct {
 
 int trace_clock_id;
 
+/*
+ * trace_parser_get_init - gets the buffer for trace parser
+ */
+int trace_parser_get_init(struct trace_parser *parser, int size)
+{
+        memset(parser, 0, sizeof(*parser));
+
+        parser->buffer = kmalloc(size, GFP_KERNEL);
+        if (!parser->buffer)
+                return 1;
+
+        parser->size = size;
+        return 0;
+}
+
+/*
+ * trace_parser_put - frees the buffer for trace parser
+ */
+void trace_parser_put(struct trace_parser *parser)
+{
+        kfree(parser->buffer);
+}
+
+/*
+ * trace_get_user - reads the user input string separated by  space
+ * (matched by isspace(ch))
+ *
+ * For each string found the 'struct trace_parser' is updated,
+ * and the function returns.
+ *
+ * Returns number of bytes read.
+ *
+ * See kernel/trace/trace.h for 'struct trace_parser' details.
+ */
+int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
+        size_t cnt, loff_t *ppos)
+{
+        char ch;
+        size_t read = 0;
+        ssize_t ret;
+
+        if (!*ppos)
+                trace_parser_clear(parser);
+
+        ret = get_user(ch, ubuf++);
+        if (ret)
+                goto out;
+
+        read++;
+        cnt--;
+
+        /*
+         * The parser is not finished with the last write,
+         * continue reading the user input without skipping spaces.
+         */
+        if (!parser->cont) {
+                /* skip white space */
+                while (cnt && isspace(ch)) {
+                        ret = get_user(ch, ubuf++);
+                        if (ret)
+                                goto out;
+                        read++;
+                        cnt--;
+                }
+
+                /* only spaces were written */
+                if (isspace(ch)) {
+                        *ppos += read;
+                        ret = read;
+                        goto out;
+                }
+
+                parser->idx = 0;
+        }
+
+        /* read the non-space input */
+        while (cnt && !isspace(ch)) {
+                if (parser->idx < parser->size)
+                        parser->buffer[parser->idx++] = ch;
+                else {
+                        ret = -EINVAL;
+                        goto out;
+                }
+                ret = get_user(ch, ubuf++);
+                if (ret)
+                        goto out;
+                read++;
+                cnt--;
+        }
+
+        /* We either got finished input or we have to wait for another call. */
+        if (isspace(ch)) {
+                parser->buffer[parser->idx] = 0;
+                parser->cont = false;
+        } else {
+                parser->cont = true;
+                parser->buffer[parser->idx++] = ch;
+        }
+
+        *ppos += read;
+        ret = read;
+
+out:
+        return ret;
+}
+
 ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf, size_t cnt)
 {
         int len;
@@ -719,6 +825,11 @@ static void trace_init_cmdlines(void)
         cmdline_idx = 0;
 }
 
+int is_tracing_stopped(void)
+{
+        return trace_stop_count;
+}
+
 /**
  * ftrace_off_permanent - disable all ftrace code permanently
  *
@@ -886,7 +997,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
 
         entry->preempt_count            = pc & 0xff;
         entry->pid                      = (tsk) ? tsk->pid : 0;
-        entry->tgid                     = (tsk) ? tsk->tgid : 0;
+        entry->lock_depth               = (tsk) ? tsk->lock_depth : 0;
         entry->flags =
 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
                 (irqs_disabled_flags(flags) ? TRACE_FLAG_IRQS_OFF : 0) |
@@ -1068,6 +1179,7 @@ ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags, int pc)
                 return;
         entry   = ring_buffer_event_data(event);
 
+        entry->tgid             = current->tgid;
         memset(&entry->caller, 0, sizeof(entry->caller));
 
         trace.nr_entries        = 0;
@@ -1094,6 +1206,7 @@ ftrace_trace_special(void *__tr,
                      unsigned long arg1, unsigned long arg2, unsigned long arg3,
                      int pc)
 {
+        struct ftrace_event_call *call = &event_special;
         struct ring_buffer_event *event;
         struct trace_array *tr = __tr;
         struct ring_buffer *buffer = tr->buffer;
@@ -1107,7 +1220,9 @@ ftrace_trace_special(void *__tr,
         entry->arg1                     = arg1;
         entry->arg2                     = arg2;
         entry->arg3                     = arg3;
-        trace_buffer_unlock_commit(buffer, event, 0, pc);
+
+        if (!filter_check_discard(call, entry, buffer, event))
+                trace_buffer_unlock_commit(buffer, event, 0, pc);
 }
 
 void
@@ -1530,10 +1645,10 @@ static void print_lat_help_header(struct seq_file *m)
         seq_puts(m, "#                | / _----=> need-resched    \n");
         seq_puts(m, "#                || / _---=> hardirq/softirq \n");
         seq_puts(m, "#                ||| / _--=> preempt-depth   \n");
-        seq_puts(m, "#                |||| /                      \n");
-        seq_puts(m, "#                |||||     delay             \n");
-        seq_puts(m, "#  cmd     pid   ||||| time  |   caller      \n");
-        seq_puts(m, "#     \\   /      |||||   \\   |   /           \n");
+        seq_puts(m, "#                |||| /_--=> lock-depth       \n");
+        seq_puts(m, "#                |||||/     delay             \n");
+        seq_puts(m, "#  cmd     pid   |||||| time  |   caller      \n");
+        seq_puts(m, "#     \\   /      ||||||   \\   |   /           \n");
 }
 
 static void print_func_help_header(struct seq_file *m)