1 files changed, 30 insertions, 16 deletions

diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 2e29d7ba5a52..9e82551dd566 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -190,7 +190,22 @@ struct trace_array {
          */
         struct trace_buffer     max_buffer;
         bool                    allocated_snapshot;
+        unsigned long           max_latency;
 #endif
+        /*
+         * max_lock is used to protect the swapping of buffers
+         * when taking a max snapshot. The buffers themselves are
+         * protected by per_cpu spinlocks. But the action of the swap
+         * needs its own lock.
+         *
+         * This is defined as a arch_spinlock_t in order to help
+         * with performance when lockdep debugging is enabled.
+         *
+         * It is also used in other places outside the update_max_tr
+         * so it needs to be defined outside of the
+         * CONFIG_TRACER_MAX_TRACE.
+         */
+        arch_spinlock_t         max_lock;
         int                     buffer_disabled;
 #ifdef CONFIG_FTRACE_SYSCALLS
         int                     sys_refcount_enter;
@@ -237,6 +252,9 @@ static inline struct trace_array *top_trace_array(void)
 {
         struct trace_array *tr;
 
+        if (list_empty(ftrace_trace_arrays.prev))
+                return NULL;
+
         tr = list_entry(ftrace_trace_arrays.prev,
                         typeof(*tr), list);
         WARN_ON(!(tr->flags & TRACE_ARRAY_FL_GLOBAL));
@@ -323,7 +341,6 @@ struct tracer_flags {
  * @stop: called when tracing is paused (echo 0 > tracing_enabled)
  * @open: called when the trace file is opened
  * @pipe_open: called when the trace_pipe file is opened
- * @wait_pipe: override how the user waits for traces on trace_pipe
  * @close: called when the trace file is released
  * @pipe_close: called when the trace_pipe file is released
  * @read: override the default read callback on trace_pipe
@@ -342,7 +359,6 @@ struct tracer {
         void                    (*stop)(struct trace_array *tr);
         void                    (*open)(struct trace_iterator *iter);
         void                    (*pipe_open)(struct trace_iterator *iter);
-        void                    (*wait_pipe)(struct trace_iterator *iter);
         void                    (*close)(struct trace_iterator *iter);
         void                    (*pipe_close)(struct trace_iterator *iter);
         ssize_t                 (*read)(struct trace_iterator *iter,
@@ -416,13 +432,7 @@ enum {
         TRACE_FTRACE_IRQ_BIT,
         TRACE_FTRACE_SIRQ_BIT,
 
-        /* GLOBAL_BITs must be greater than FTRACE_BITs */
-        TRACE_GLOBAL_BIT,
-        TRACE_GLOBAL_NMI_BIT,
-        TRACE_GLOBAL_IRQ_BIT,
-        TRACE_GLOBAL_SIRQ_BIT,
-
-        /* INTERNAL_BITs must be greater than GLOBAL_BITs */
+        /* INTERNAL_BITs must be greater than FTRACE_BITs */
         TRACE_INTERNAL_BIT,
         TRACE_INTERNAL_NMI_BIT,
         TRACE_INTERNAL_IRQ_BIT,
@@ -449,9 +459,6 @@ enum {
 #define TRACE_FTRACE_START      TRACE_FTRACE_BIT
 #define TRACE_FTRACE_MAX        ((1 << (TRACE_FTRACE_START + TRACE_CONTEXT_BITS)) - 1)
 
-#define TRACE_GLOBAL_START      TRACE_GLOBAL_BIT
-#define TRACE_GLOBAL_MAX        ((1 << (TRACE_GLOBAL_START + TRACE_CONTEXT_BITS)) - 1)
-
 #define TRACE_LIST_START        TRACE_INTERNAL_BIT
 #define TRACE_LIST_MAX          ((1 << (TRACE_LIST_START + TRACE_CONTEXT_BITS)) - 1)
 
@@ -560,8 +567,6 @@ void trace_init_global_iter(struct trace_iterator *iter);
 
 void tracing_iter_reset(struct trace_iterator *iter, int cpu);
 
-void poll_wait_pipe(struct trace_iterator *iter);
-
 void tracing_sched_switch_trace(struct trace_array *tr,
                                 struct task_struct *prev,
                                 struct task_struct *next,
@@ -608,8 +613,6 @@ extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 extern unsigned long tracing_thresh;
 
 #ifdef CONFIG_TRACER_MAX_TRACE
-extern unsigned long tracing_max_latency;
-
 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 void update_max_tr_single(struct trace_array *tr,
                           struct task_struct *tsk, int cpu);
@@ -724,6 +727,8 @@ extern unsigned long trace_flags;
 #define TRACE_GRAPH_PRINT_PROC          0x8
 #define TRACE_GRAPH_PRINT_DURATION      0x10
 #define TRACE_GRAPH_PRINT_ABS_TIME      0x20
+#define TRACE_GRAPH_PRINT_IRQS          0x40
+#define TRACE_GRAPH_PRINT_TAIL          0x80
 #define TRACE_GRAPH_PRINT_FILL_SHIFT    28
 #define TRACE_GRAPH_PRINT_FILL_MASK     (0x3 << TRACE_GRAPH_PRINT_FILL_SHIFT)
 
@@ -823,6 +828,10 @@ extern int ftrace_is_dead(void);
 int ftrace_create_function_files(struct trace_array *tr,
                                  struct dentry *parent);
 void ftrace_destroy_function_files(struct trace_array *tr);
+void ftrace_init_global_array_ops(struct trace_array *tr);
+void ftrace_init_array_ops(struct trace_array *tr, ftrace_func_t func);
+void ftrace_reset_array_ops(struct trace_array *tr);
+int using_ftrace_ops_list_func(void);
 #else
 static inline int ftrace_trace_task(struct task_struct *task)
 {
@@ -836,6 +845,11 @@ ftrace_create_function_files(struct trace_array *tr,
         return 0;
 }
 static inline void ftrace_destroy_function_files(struct trace_array *tr) { }
+static inline __init void
+ftrace_init_global_array_ops(struct trace_array *tr) { }
+static inline void ftrace_reset_array_ops(struct trace_array *tr) { }
+/* ftace_func_t type is not defined, use macro instead of static inline */
+#define ftrace_init_array_ops(tr, func) do { } while (0)
 #endif /* CONFIG_FUNCTION_TRACER */
 
 #if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_DYNAMIC_FTRACE)