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function_graph: Remove the use of FTRACE_NOTRACE_DEPTH
The curr_ret_stack is no longer set to a negative value when a function is not to be traced by the function graph tracer. Remove the usage of FTRACE_NOTRACE_DEPTH, as it is no longer needed. Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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@ -790,7 +790,6 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
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*/
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#define __notrace_funcgraph notrace
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#define FTRACE_NOTRACE_DEPTH 65536
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#define FTRACE_RETFUNC_DEPTH 50
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#define FTRACE_RETSTACK_ALLOC_SIZE 32
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extern int register_ftrace_graph(trace_func_graph_ret_t retfunc,
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@ -112,16 +112,6 @@ ftrace_pop_return_trace(struct ftrace_graph_ret *trace, unsigned long *ret,
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index = current->curr_ret_stack;
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/*
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* A negative index here means that it's just returned from a
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* notrace'd function. Recover index to get an original
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* return address. See ftrace_push_return_trace().
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*
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* TODO: Need to check whether the stack gets corrupted.
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*/
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if (index < 0)
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index += FTRACE_NOTRACE_DEPTH;
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if (unlikely(index < 0 || index >= FTRACE_RETFUNC_DEPTH)) {
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ftrace_graph_stop();
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WARN_ON(1);
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@ -190,15 +180,6 @@ unsigned long ftrace_return_to_handler(unsigned long frame_pointer)
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*/
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barrier();
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current->curr_ret_stack--;
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/*
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* The curr_ret_stack can be less than -1 only if it was
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* filtered out and it's about to return from the function.
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* Recover the index and continue to trace normal functions.
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*/
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if (current->curr_ret_stack < -1) {
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current->curr_ret_stack += FTRACE_NOTRACE_DEPTH;
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return ret;
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}
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if (unlikely(!ret)) {
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ftrace_graph_stop();
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@ -115,9 +115,6 @@ unsigned long ftrace_graph_ret_addr(struct task_struct *task, int *idx,
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if (ret != (unsigned long)return_to_handler)
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return ret;
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if (index < -1)
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index += FTRACE_NOTRACE_DEPTH;
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if (index < 0)
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return ret;
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@ -675,10 +672,6 @@ print_graph_entry_leaf(struct trace_iterator *iter,
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cpu_data = per_cpu_ptr(data->cpu_data, cpu);
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/* If a graph tracer ignored set_graph_notrace */
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if (call->depth < -1)
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call->depth += FTRACE_NOTRACE_DEPTH;
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/*
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* Comments display at + 1 to depth. Since
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* this is a leaf function, keep the comments
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@ -721,10 +714,6 @@ print_graph_entry_nested(struct trace_iterator *iter,
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struct fgraph_cpu_data *cpu_data;
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int cpu = iter->cpu;
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/* If a graph tracer ignored set_graph_notrace */
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if (call->depth < -1)
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call->depth += FTRACE_NOTRACE_DEPTH;
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cpu_data = per_cpu_ptr(data->cpu_data, cpu);
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cpu_data->depth = call->depth;
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