1 files changed, 43 insertions, 12 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index e0c2545622e8..b6c12c6a1bcd 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -69,6 +69,9 @@ enum print_line_t trace_print_printk_msg_only(struct trace_iterator *iter)
  * @s: trace sequence descriptor
  * @fmt: printf format string
  *
+ * It returns 0 if the trace oversizes the buffer's free
+ * space, 1 otherwise.
+ *
  * The tracer may use either sequence operations or its own
  * copy to user routines. To simplify formating of a trace
  * trace_seq_printf is used to store strings into a special
@@ -95,7 +98,7 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
 
         s->len += ret;
 
-        return len;
+        return 1;
 }
 EXPORT_SYMBOL_GPL(trace_seq_printf);
 
@@ -407,7 +410,7 @@ seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
                  * since individual threads might have already quit!
                  */
                 rcu_read_lock();
-                task = find_task_by_vpid(entry->ent.tgid);
+                task = find_task_by_vpid(entry->tgid);
                 if (task)
                         mm = get_task_mm(task);
                 rcu_read_unlock();
@@ -460,18 +463,23 @@ seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
         return ret;
 }
 
-static int
-lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
+/**
+ * trace_print_lat_fmt - print the irq, preempt and lockdep fields
+ * @s: trace seq struct to write to
+ * @entry: The trace entry field from the ring buffer
+ *
+ * Prints the generic fields of irqs off, in hard or softirq, preempt
+ * count and lock depth.
+ */
+int trace_print_lat_fmt(struct trace_seq *s, struct trace_entry *entry)
 {
         int hardirq, softirq;
-        char comm[TASK_COMM_LEN];
+        int ret;
 
-        trace_find_cmdline(entry->pid, comm);
         hardirq = entry->flags & TRACE_FLAG_HARDIRQ;
         softirq = entry->flags & TRACE_FLAG_SOFTIRQ;
 
-        if (!trace_seq_printf(s, "%8.8s-%-5d %3d%c%c%c",
-                              comm, entry->pid, cpu,
+        if (!trace_seq_printf(s, "%c%c%c",
                               (entry->flags & TRACE_FLAG_IRQS_OFF) ? 'd' :
                                 (entry->flags & TRACE_FLAG_IRQS_NOSUPPORT) ?
                                   'X' : '.',
@@ -482,8 +490,31 @@ lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
                 return 0;
 
         if (entry->preempt_count)
-                return trace_seq_printf(s, "%x", entry->preempt_count);
-        return trace_seq_puts(s, ".");
+                ret = trace_seq_printf(s, "%x", entry->preempt_count);
+        else
+                ret = trace_seq_putc(s, '.');
+
+        if (!ret)
+                return 0;
+
+        if (entry->lock_depth < 0)
+                return trace_seq_putc(s, '.');
+
+        return trace_seq_printf(s, "%d", entry->lock_depth);
+}
+
+static int
+lat_print_generic(struct trace_seq *s, struct trace_entry *entry, int cpu)
+{
+        char comm[TASK_COMM_LEN];
+
+        trace_find_cmdline(entry->pid, comm);
+
+        if (!trace_seq_printf(s, "%8.8s-%-5d %3d",
+                              comm, entry->pid, cpu))
+                return 0;
+
+        return trace_print_lat_fmt(s, entry);
 }
 
 static unsigned long preempt_mark_thresh = 100;
@@ -857,7 +888,7 @@ static int trace_ctxwake_raw(struct trace_iterator *iter, char S)
         trace_assign_type(field, iter->ent);
 
         if (!S)
-                task_state_char(field->prev_state);
+                S = task_state_char(field->prev_state);
         T = task_state_char(field->next_state);
         if (!trace_seq_printf(&iter->seq, "%d %d %c %d %d %d %c\n",
                               field->prev_pid,
@@ -892,7 +923,7 @@ static int trace_ctxwake_hex(struct trace_iterator *iter, char S)
         trace_assign_type(field, iter->ent);
 
         if (!S)
-                task_state_char(field->prev_state);
+                S = task_state_char(field->prev_state);
         T = task_state_char(field->next_state);
 
         SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);