On Wed, 2013-09-25 at 11:00 +0200, Hannes Frederic Sowa wrote:

>  /*
> + * Busy loop until the nonblocking_pool is intialized and return
> + * random data in buf of size nbytes.
> + *
> + * This is used by the network stack to defer the extraction of
> + * entropy from the nonblocking_pool until the pool is initialized.
> + *
> + * We need to busy loop here, because we could be called from an
> + * atomic section.
> + */
> +void get_random_bytes_busy_wait_initialized(void *buf, int nbytes)
> +{
> +	while (!nonblocking_pool.initialized)
> +		cpu_relax();
> +	get_random_bytes(buf, nbytes);
> +}

No idea if this can work if called from IRQ context.

How is nonblocking_poll initialized if host has a single cpu ?