1 files changed, 76 insertions, 0 deletions

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 4021a5e66412..5043a0c4dde0 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -350,6 +350,77 @@ void tracing_on(void)
 }
 EXPORT_SYMBOL_GPL(tracing_on);
 
+/**
+ * __trace_puts - write a constant string into the trace buffer.
+ * @ip:    The address of the caller
+ * @str:   The constant string to write
+ * @size:  The size of the string.
+ */
+int __trace_puts(unsigned long ip, const char *str, int size)
+{
+        struct ring_buffer_event *event;
+        struct ring_buffer *buffer;
+        struct print_entry *entry;
+        unsigned long irq_flags;
+        int alloc;
+
+        alloc = sizeof(*entry) + size + 2; /* possible \n added */
+
+        local_save_flags(irq_flags);
+        buffer = global_trace.trace_buffer.buffer;
+        event = trace_buffer_lock_reserve(buffer, TRACE_PRINT, alloc, 
+                                          irq_flags, preempt_count());
+        if (!event)
+                return 0;
+
+        entry = ring_buffer_event_data(event);
+        entry->ip = ip;
+
+        memcpy(&entry->buf, str, size);
+
+        /* Add a newline if necessary */
+        if (entry->buf[size - 1] != '\n') {
+                entry->buf[size] = '\n';
+                entry->buf[size + 1] = '\0';
+        } else
+                entry->buf[size] = '\0';
+
+        __buffer_unlock_commit(buffer, event);
+
+        return size;
+}
+EXPORT_SYMBOL_GPL(__trace_puts);
+
+/**
+ * __trace_bputs - write the pointer to a constant string into trace buffer
+ * @ip:    The address of the caller
+ * @str:   The constant string to write to the buffer to
+ */
+int __trace_bputs(unsigned long ip, const char *str)
+{
+        struct ring_buffer_event *event;
+        struct ring_buffer *buffer;
+        struct bputs_entry *entry;
+        unsigned long irq_flags;
+        int size = sizeof(struct bputs_entry);
+
+        local_save_flags(irq_flags);
+        buffer = global_trace.trace_buffer.buffer;
+        event = trace_buffer_lock_reserve(buffer, TRACE_BPUTS, size,
+                                          irq_flags, preempt_count());
+        if (!event)
+                return 0;
+
+        entry = ring_buffer_event_data(event);
+        entry->ip                       = ip;
+        entry->str                      = str;
+
+        __buffer_unlock_commit(buffer, event);
+
+        return 1;
+}
+EXPORT_SYMBOL_GPL(__trace_bputs);
+
 #ifdef CONFIG_TRACER_SNAPSHOT
 /**
  * trace_snapshot - take a snapshot of the current buffer.
@@ -2475,6 +2546,11 @@ enum print_line_t print_trace_line(struct trace_iterator *iter)
                         return ret;
         }
 
+        if (iter->ent->type == TRACE_BPUTS &&
+                        trace_flags & TRACE_ITER_PRINTK &&
+                        trace_flags & TRACE_ITER_PRINTK_MSGONLY)
+                return trace_print_bputs_msg_only(iter);
+
         if (iter->ent->type == TRACE_BPRINT &&
                         trace_flags & TRACE_ITER_PRINTK &&
                         trace_flags & TRACE_ITER_PRINTK_MSGONLY)