#ifdef CONFIG_FUNCTION_TRACER
static void
perf_ftrace_function_call(unsigned long ip, unsigned long parent_ip,
- struct ftrace_ops *ops, struct pt_regs *pt_regs)
+ struct ftrace_ops *ops, struct ftrace_regs *fregs)
{
struct ftrace_entry *entry;
struct perf_event *event;
struct hlist_head head;
struct pt_regs regs;
int rctx;
+ int bit;
+
+ if (!rcu_is_watching())
+ return;
if ((unsigned long)ops->private != smp_processor_id())
return;
+ bit = ftrace_test_recursion_trylock(ip, parent_ip);
+ if (bit < 0)
+ return;
+
event = container_of(ops, struct perf_event, ftrace_ops);
/*
entry = perf_trace_buf_alloc(ENTRY_SIZE, NULL, &rctx);
if (!entry)
- return;
+ goto out;
entry->ip = ip;
entry->parent_ip = parent_ip;
perf_trace_buf_submit(entry, ENTRY_SIZE, rctx, TRACE_FN,
1, ®s, &head, NULL);
+out:
+ ftrace_test_recursion_unlock(bit);
#undef ENTRY_SIZE
}
{
struct ftrace_ops *ops = &event->ftrace_ops;
- ops->flags = FTRACE_OPS_FL_RCU;
ops->func = perf_ftrace_function_call;
ops->private = (void *)(unsigned long)nr_cpu_ids;