#ifndef __BACKPORT_LINUX_STRING_H
#define __BACKPORT_LINUX_STRING_H
#include_next <linux/string.h>
#include <linux/version.h>

#if LINUX_VERSION_IS_LESS(4,5,0)
#define memdup_user_nul LINUX_BACKPORT(memdup_user_nul)
extern void *memdup_user_nul(const void __user *, size_t);
#endif

#if LINUX_VERSION_IS_LESS(4,6,0)
int match_string(const char * const *array, size_t n, const char *string);
#endif /* LINUX_VERSION_IS_LESS(4,5,0) */

#ifndef memset_after
#define memset_after(obj, v, member)					\
({									\
	u8 *__ptr = (u8 *)(obj);					\
	typeof(v) __val = (v);						\
	memset(__ptr + offsetofend(typeof(*(obj)), member), __val,	\
	       sizeof(*(obj)) - offsetofend(typeof(*(obj)), member));	\
})
#endif

#ifndef memset_startat
#define memset_startat(obj, v, member)					\
({									\
	u8 *__ptr = (u8 *)(obj);					\
	typeof(v) __val = (v);						\
	memset(__ptr + offsetof(typeof(*(obj)), member), __val,		\
	       sizeof(*(obj)) - offsetof(typeof(*(obj)), member));	\
})
#endif

#endif /* __BACKPORT_LINUX_STRING_H */