tracing: Kill unused and puzzled sample code in ftrace.h

When doing per-cpu helper optimizing work, find that this code is so puzzled.
1. It's mark as comment text, maybe a sample function for guidelines
   or a todo work.
2. But, this sample code is odd where struct perf_trace_buf is nonexistent.
   commit ce71b9 delete struct perf_trace_buf definition.

   Author: Frederic Weisbecker <fweisbec@gmail.com>
   Date:   Sun Nov 22 05:26:55 2009 +0100

   tracing: Use the perf recursion protection from trace event

Is it necessary to keep there?
just compile test.

Link: http://lkml.kernel.org/r/50949FC9.6050202@gmail.com

Signed-off-by: Shan Wei <davidshan@tencent.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 0 insertions, 73 deletions

diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 698f2a890322..40dc5e8fe340 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -619,79 +619,6 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
 
 #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
 
-/*
- * Define the insertion callback to perf events
- *
- * The job is very similar to ftrace_raw_event_<call> except that we don't
- * insert in the ring buffer but in a perf counter.
- *
- * static void ftrace_perf_<call>(proto)
- * {
- *      struct ftrace_data_offsets_<call> __maybe_unused __data_offsets;
- *      struct ftrace_event_call *event_call = &event_<call>;
- *      extern void perf_tp_event(int, u64, u64, void *, int);
- *      struct ftrace_raw_##call *entry;
- *      struct perf_trace_buf *trace_buf;
- *      u64 __addr = 0, __count = 1;
- *      unsigned long irq_flags;
- *      struct trace_entry *ent;
- *      int __entry_size;
- *      int __data_size;
- *      int __cpu
- *      int pc;
- *
- *      pc = preempt_count();
- *
- *      __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
- *
- *      // Below we want to get the aligned size by taking into account
- *      // the u32 field that will later store the buffer size
- *      __entry_size = ALIGN(__data_size + sizeof(*entry) + sizeof(u32),
- *                           sizeof(u64));
- *      __entry_size -= sizeof(u32);
- *
- *      // Protect the non nmi buffer
- *      // This also protects the rcu read side
- *      local_irq_save(irq_flags);
- *      __cpu = smp_processor_id();
- *
- *      if (in_nmi())
- *              trace_buf = rcu_dereference_sched(perf_trace_buf_nmi);
- *      else
- *              trace_buf = rcu_dereference_sched(perf_trace_buf);
- *
- *      if (!trace_buf)
- *              goto end;
- *
- *      trace_buf = per_cpu_ptr(trace_buf, __cpu);
- *
- *      // Avoid recursion from perf that could mess up the buffer
- *      if (trace_buf->recursion++)
- *              goto end_recursion;
- *
- *      raw_data = trace_buf->buf;
- *
- *      // Make recursion update visible before entering perf_tp_event
- *      // so that we protect from perf recursions.
- *
- *      barrier();
- *
- *      //zero dead bytes from alignment to avoid stack leak to userspace:
- *      *(u64 *)(&raw_data[__entry_size - sizeof(u64)]) = 0ULL;
- *      entry = (struct ftrace_raw_<call> *)raw_data;
- *      ent = &entry->ent;
- *      tracing_generic_entry_update(ent, irq_flags, pc);
- *      ent->type = event_call->id;
- *
- *      <tstruct> <- do some jobs with dynamic arrays
- *
- *      <assign>  <- affect our values
- *
- *      perf_tp_event(event_call->id, __addr, __count, entry,
- *                   __entry_size);  <- submit them to perf counter
- *
- * }
- */
 
 #ifdef CONFIG_PERF_EVENTS