Merge branches 'tracing/ftrace', 'tracing/function-graph-tracer' and 'tracing/urgent...

diff --cc block/blk-core.c
Simple merge

diff --cc block/elevator.c
Simple merge

diff --cc kernel/trace/trace.c
index 1bd9574404e5020b77b8432c1cff74130a190401,1ca74c0cee6a6c7440663dbd673167dc59d52fcd,d86e3252f3000024cfaf31c63ffbee765dafac53..ea38652d631cdab35235eca517242c6f58cd937b
--- 1/kernel/trace/trace.c
--- 2/kernel/trace/trace.c
--- 3/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@@@ -1165,97 -1165,86 -884,12 +1165,97 @@@@ function_trace_call_preempt_only(unsign
                trace_function(tr, data, ip, parent_ip, flags, pc);
   
        atomic_dec(&data->disabled);
  -     if (resched)
  -             preempt_enable_no_resched_notrace();
  -     else
  -             preempt_enable_notrace();
  +     ftrace_preempt_enable(resched);
   }
   
  +static void
  +function_trace_call(unsigned long ip, unsigned long parent_ip)
  +{
  +     struct trace_array *tr = &global_trace;
  +     struct trace_array_cpu *data;
  +     unsigned long flags;
  +     long disabled;
  +     int cpu;
  +     int pc;
  +
  +     if (unlikely(!ftrace_function_enabled))
  +             return;
  +
  +     /*
  +      * Need to use raw, since this must be called before the
  +      * recursive protection is performed.
  +      */
  +     local_irq_save(flags);
  +     cpu = raw_smp_processor_id();
  +     data = tr->data[cpu];
  +     disabled = atomic_inc_return(&data->disabled);
  +
  +     if (likely(disabled == 1)) {
  +             pc = preempt_count();
  +             trace_function(tr, data, ip, parent_ip, flags, pc);
  +     }
  +
  +     atomic_dec(&data->disabled);
  +     local_irq_restore(flags);
  +}
  +
  +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
  +int trace_graph_entry(struct ftrace_graph_ent *trace)
  +{
  +     struct trace_array *tr = &global_trace;
  +     struct trace_array_cpu *data;
  +     unsigned long flags;
  +     long disabled;
  +     int cpu;
  +     int pc;
  +
 ++     if (!ftrace_trace_task(current))
 ++             return 0;
 ++
 ++     if (!ftrace_graph_addr(trace->func))
 ++             return 0;
 ++
  +     local_irq_save(flags);
  +     cpu = raw_smp_processor_id();
  +     data = tr->data[cpu];
  +     disabled = atomic_inc_return(&data->disabled);
  +     if (likely(disabled == 1)) {
  +             pc = preempt_count();
  +             __trace_graph_entry(tr, data, trace, flags, pc);
  +     }
 ++     /* Only do the atomic if it is not already set */
 ++     if (!test_tsk_trace_graph(current))
 ++             set_tsk_trace_graph(current);
  +     atomic_dec(&data->disabled);
  +     local_irq_restore(flags);
  +
  +     return 1;
  +}
  +
  +void trace_graph_return(struct ftrace_graph_ret *trace)
  +{
  +     struct trace_array *tr = &global_trace;
  +     struct trace_array_cpu *data;
  +     unsigned long flags;
  +     long disabled;
  +     int cpu;
  +     int pc;
  +
  +     local_irq_save(flags);
  +     cpu = raw_smp_processor_id();
  +     data = tr->data[cpu];
  +     disabled = atomic_inc_return(&data->disabled);
  +     if (likely(disabled == 1)) {
  +             pc = preempt_count();
  +             __trace_graph_return(tr, data, trace, flags, pc);
  +     }
 ++     if (!trace->depth)
 ++             clear_tsk_trace_graph(current);
  +     atomic_dec(&data->disabled);
  +     local_irq_restore(flags);
  +}
  +#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
  +
   static struct ftrace_ops trace_ops __read_mostly =
   {
        .func = function_trace_call,

diff --cc kernel/trace/trace.h
index b4b7b735184da9dff361f325b64093abb87d64dd,fce98898205a71579427fc4e859afeacc915cbde,8465ad052707afe380e2fba0017c0f37fb1d5093..a71bbe0a3631dbaebdbd49b16d14e1f746ca17d4
--- 1/kernel/trace/trace.h
--- 2/kernel/trace/trace.h
--- 3/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@@@ -502,59 -504,17 -396,6 +504,59 @@@@ trace_vprintk(unsigned long ip, int dep
   
   extern unsigned long trace_flags;
   
 - #endif
  +/* Standard output formatting function used for function return traces */
  +#ifdef CONFIG_FUNCTION_GRAPH_TRACER
  +extern enum print_line_t print_graph_function(struct trace_iterator *iter);
 ++
 ++#ifdef CONFIG_DYNAMIC_FTRACE
 ++/* TODO: make this variable */
 ++#define FTRACE_GRAPH_MAX_FUNCS               32
 ++extern int ftrace_graph_count;
 ++extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
 ++
 ++static inline int ftrace_graph_addr(unsigned long addr)
 ++{
 ++     int i;
 ++
 ++     if (!ftrace_graph_count || test_tsk_trace_graph(current))
 ++             return 1;
 ++
 ++     for (i = 0; i < ftrace_graph_count; i++) {
 ++             if (addr == ftrace_graph_funcs[i])
 ++                     return 1;
 ++     }
 ++
 ++     return 0;
 ++}
  +#else
 ++static inline int ftrace_trace_addr(unsigned long addr)
 ++{
 ++     return 1;
 ++}
 ++static inline int ftrace_graph_addr(unsigned long addr)
 ++{
 ++     return 1;
 ++}
 ++#endif /* CONFIG_DYNAMIC_FTRACE */
 ++
 ++#else /* CONFIG_FUNCTION_GRAPH_TRACER */
  +static inline enum print_line_t
  +print_graph_function(struct trace_iterator *iter)
  +{
  +     return TRACE_TYPE_UNHANDLED;
  +}
 ++#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
 ++
 ++extern struct pid *ftrace_pid_trace;
 ++
 ++static inline int ftrace_trace_task(struct task_struct *task)
 ++{
 ++     if (ftrace_pid_trace)
 ++             return 1;
 ++
 ++     return test_tsk_trace_trace(task);
 ++}
  +
   /*
    * trace_iterator_flags is an enumeration that defines bit
    * positions into trace_flags that controls the output.