random: Return nbytes filled from hw RNG

 * key known by the NSA).  So it's useful if we need the speed, but

 * only if we're willing to trust the hardware manufacturer not to

 * have put in a back door.

 *

 * Return number of bytes filled in.

 */

void get_random_bytes_arch(void *buf, int nbytes)

int __must_check get_random_bytes_arch(void *buf, int nbytes)

{

	int left = nbytes;

	char *p = buf;

	trace_get_random_bytes_arch(nbytes, _RET_IP_);

	while (nbytes) {

	trace_get_random_bytes_arch(left, _RET_IP_);

	while (left) {

		unsigned long v;

		int chunk = min(nbytes, (int)sizeof(unsigned long));

		int chunk = min_t(int, left, sizeof(unsigned long));

		if (!arch_get_random_long(&v))

			break;

		memcpy(p, &v, chunk);

		p += chunk;

		nbytes -= chunk;

		left -= chunk;

	}

	if (nbytes)

		get_random_bytes(p, nbytes);

	return nbytes - left;

}

EXPORT_SYMBOL(get_random_bytes_arch);

extern int wait_for_random_bytes(void);

extern int add_random_ready_callback(struct random_ready_callback *rdy);

extern void del_random_ready_callback(struct random_ready_callback *rdy);

extern void get_random_bytes_arch(void *buf, int nbytes);

extern int __must_check get_random_bytes_arch(void *buf, int nbytes);

#ifndef MODULE

extern const struct file_operations random_fops, urandom_fops;