[CRIU] [PATCH 3/3] plugins: Use new plugins engine

[Pavel Emelyanov]

> +#define run_plugin_hooks(__hook, ...)					\
> +({									\
> +	cr_plugin_desc_t *d;						\
> +	plugin_desc_t *this;						\
> +	int __ret = -ENOTSUP;						\
> +									\
> +	list_for_each_entry(this, &cr_plugins_list, list) {		\
> +		d = cr_plugin_desc_from(this);				\
> +		if (d->max_hooks >= (unsigned int)__hook ||		\
> +		    !d->hooks[__hook])					\

Can we avoid this if (!hook) continue; looking? Most of the plugins
are expected to provide only 2 callbacks out of all possible (7 now).
Thus this loop is even now 70% empty, but things will get worse.

> +			continue;					\
> +		__ret = ((__hook ##_t *)d->hooks[__hook])(__VA_ARGS__);	\
> +		if (__ret == -ENOTSUP)					\
> +			continue;					\
> +		else if (__ret)						\
> +			break;						\
> +	}								\
> +	__ret;								\
> +})