Merge tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:
 "This release has no new tracing features, just clean ups, minor fixes
  and small optimizations"

* tag 'trace-v4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (25 commits)
  tracing: Remove outdated ring buffer comment
  tracing/probes: Fix a warning message to show correct maximum length
  tracing: Fix return value check in trace_benchmark_reg()
  tracing: Use modern function declaration
  jump_label: Reduce the size of struct static_key
  tracing/probe: Show subsystem name in messages
  tracing/hwlat: Update old comment about migration
  timers: Make flags output in the timer_start tracepoint useful
  tracing: Have traceprobe_probes_write() not access userspace unnecessarily
  tracing: Have COMM event filter key be treated as a string
  ftrace: Have set_graph_function handle multiple functions in one write
  ftrace: Do not hold references of ftrace_graph_{notrace_}hash out of graph_lock
  tracing: Reset parser->buffer to allow multiple "puts"
  ftrace: Have set_graph_functions handle write with RDWR
  ftrace: Reset fgd->hash in ftrace_graph_write()
  ftrace: Replace (void *)1 with a meaningful macro name FTRACE_GRAPH_EMPTY
  ftrace: Create a slight optimization on searching the ftrace_hash
  tracing: Add ftrace_hash_key() helper function
  ftrace: Convert graph filter to use hash tables
  ftrace: Expose ftrace_hash_empty and ftrace_lookup_ip
  ...

1 files changed, 15 insertions, 8 deletions

diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index b63d6b7b0db0..8e06d758ee48 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -89,11 +89,17 @@ extern bool static_key_initialized;
 
 struct static_key {
 	atomic_t enabled;
-/* Set lsb bit to 1 if branch is default true, 0 ot */
-	struct jump_entry *entries;
-#ifdef CONFIG_MODULES
-	struct static_key_mod *next;
-#endif
+/*
+ * bit 0 => 1 if key is initially true
+ *	    0 if initially false
+ * bit 1 => 1 if points to struct static_key_mod
+ *	    0 if points to struct jump_entry
+ */
+	union {
+		unsigned long type;
+		struct jump_entry *entries;
+		struct static_key_mod *next;
+	};
 };
 
 #else
@@ -118,9 +124,10 @@ struct module;
 
 #ifdef HAVE_JUMP_LABEL
 
-#define JUMP_TYPE_FALSE	0UL
-#define JUMP_TYPE_TRUE	1UL
-#define JUMP_TYPE_MASK	1UL
+#define JUMP_TYPE_FALSE		0UL
+#define JUMP_TYPE_TRUE		1UL
+#define JUMP_TYPE_LINKED	2UL
+#define JUMP_TYPE_MASK		3UL
 
 static __always_inline bool static_key_false(struct static_key *key)
 {