#include <linux/bitops.h>#include <linux/kernel.h>#include <linux/random.h>#include <linux/slab.h>#include <linux/types.h> #include "drm_random.h" static inline u32 drm_prandom_u32_max_state(u32 ep_ro, struct rnd_state *state){	return upper_32_bits((u64)prandom_u32_state(state) * ep_ro);} void drm_random_reorder(unsigned int *order, unsigned int count,			struct rnd_state *state){	unsigned int i, j; 	for (i = 0; i < count; ++i) {		BUILD_BUG_ON(sizeof(unsigned int) > sizeof(u32));		j = drm_prandom_u32_max_state(count, state);		swap(order[i], order[j]);	}}EXPORT_SYMBOL(drm_random_reorder); unsigned int *drm_random_order(unsigned int count, struct rnd_state *state){	unsigned int *order, i; 	order = kmalloc_array(count, sizeof(*order), GFP_TEMPORARY);	if (!order)		return order; 	for (i = 0; i < count; i++)		order[i] = i; 	drm_random_reorder(order, count, state);	return order;}EXPORT_SYMBOL(drm_random_order);