tracing/boot: Add synthetic event support

}

#endif

#ifdef CONFIG_HIST_TRIGGERS

extern int synth_event_run_command(const char *command);

static int __init

trace_boot_add_synth_event(struct xbc_node *node, const char *event)

{

	struct xbc_node *anode;

	char buf[MAX_BUF_LEN], *q;

	const char *p;

	int len, delta, ret;

	len = ARRAY_SIZE(buf);

	delta = snprintf(buf, len, "%s", event);

	if (delta >= len) {

		pr_err("Event name is too long: %s\n", event);

		return -E2BIG;

	}

	len -= delta; q = buf + delta;

	xbc_node_for_each_array_value(node, "fields", anode, p) {

		delta = snprintf(q, len, " %s;", p);

		if (delta >= len) {

			pr_err("fields string is too long: %s\n", p);

			return -E2BIG;

		}

		len -= delta; q += delta;

	}

	ret = synth_event_run_command(buf);

	if (ret < 0)

		pr_err("Failed to add synthetic event: %s\n", buf);

	return ret;

}

#else

static inline int __init

trace_boot_add_synth_event(struct xbc_node *node, const char *event)

{

	pr_err("Synthetic event is not supported.\n");

	return -ENOTSUPP;

}

#endif

static void __init

trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,

			  struct xbc_node *enode)

	if (!strcmp(group, "kprobes"))

		if (trace_boot_add_kprobe_event(enode, event) < 0)

			return;

	if (!strcmp(group, "synthetic"))

		if (trace_boot_add_synth_event(enode, event) < 0)

			return;

	mutex_lock(&event_mutex);

	file = find_event_file(tr, group, event);

	return ret == -ECANCELED ? -EINVAL : ret;

}

int synth_event_run_command(const char *command)

{

	return trace_run_command(command, create_or_delete_synth_event);

}

static int synth_event_create(int argc, const char **argv)

{

	const char *name = argv[0];