1 files changed, 39 insertions, 0 deletions

diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
index 7136420603aa..a4840c260c89 100644
--- a/kernel/trace/trace_output.c
+++ b/kernel/trace/trace_output.c
@@ -15,6 +15,9 @@
 #define EVENT_HASHSIZE  128
 
 static DECLARE_RWSEM(trace_event_mutex);
+
+DEFINE_PER_CPU(struct trace_seq, ftrace_event_seq);
+
 static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
 
 static int next_event_type = __TRACE_LAST_TYPE + 1;
@@ -212,6 +215,42 @@ int trace_seq_path(struct trace_seq *s, struct path *path)
         return 0;
 }
 
+const char *
+ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
+                       unsigned long flags,
+                       const struct trace_print_flags *flag_array)
+{
+        unsigned long mask;
+        const char *str;
+        int i;
+
+        trace_seq_init(p);
+
+        for (i = 0;  flag_array[i].name && flags; i++) {
+
+                mask = flag_array[i].mask;
+                if ((flags & mask) != mask)
+                        continue;
+
+                str = flag_array[i].name;
+                flags &= ~mask;
+                if (p->len && delim)
+                        trace_seq_puts(p, delim);
+                trace_seq_puts(p, str);
+        }
+
+        /* check for left over flags */
+        if (flags) {
+                if (p->len && delim)
+                        trace_seq_puts(p, delim);
+                trace_seq_printf(p, "0x%lx", flags);
+        }
+
+        trace_seq_putc(p, 0);
+
+        return p->buffer;
+}
+
 #ifdef CONFIG_KRETPROBES
 static inline const char *kretprobed(const char *name)
 {