diff options
Diffstat (limited to 'kernel/trace/fgraph.c')
| -rw-r--r-- | kernel/trace/fgraph.c | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c index 5ad9c0e88b80..e852b69c0e64 100644 --- a/kernel/trace/fgraph.c +++ b/kernel/trace/fgraph.c @@ -64,30 +64,9 @@ ftrace_push_return_trace(unsigned long ret, unsigned long func, return -EBUSY; } - /* - * The curr_ret_stack is an index to ftrace return stack of - * current task. Its value should be in [0, FTRACE_RETFUNC_ - * DEPTH) when the function graph tracer is used. To support - * filtering out specific functions, it makes the index - * negative by subtracting huge value (FTRACE_NOTRACE_DEPTH) - * so when it sees a negative index the ftrace will ignore - * the record. And the index gets recovered when returning - * from the filtered function by adding the FTRACE_NOTRACE_ - * DEPTH and then it'll continue to record functions normally. - * - * The curr_ret_stack is initialized to -1 and get increased - * in this function. So it can be less than -1 only if it was - * filtered out via ftrace_graph_notrace_addr() which can be - * set from set_graph_notrace file in tracefs by user. - */ - if (current->curr_ret_stack < -1) - return -EBUSY; - calltime = trace_clock_local(); index = ++current->curr_ret_stack; - if (ftrace_graph_notrace_addr(func)) - current->curr_ret_stack -= FTRACE_NOTRACE_DEPTH; barrier(); current->ret_stack[index].ret = ret; current->ret_stack[index].func = func; |