riscv: use memcpy based uaccess for nommu again

	select SYSCTL_EXCEPTION_TRACE

	select THREAD_INFO_IN_TASK

	select SET_FS

	select UACCESS_MEMCPY if !MMU

config ARCH_MMAP_RND_BITS_MIN

	default 18 if 64BIT

/*

 * User space memory access functions

 */

extern unsigned long __must_check __asm_copy_to_user(void __user *to,

	const void *from, unsigned long n);

extern unsigned long __must_check __asm_copy_from_user(void *to,

	const void __user *from, unsigned long n);

static inline unsigned long

raw_copy_from_user(void *to, const void __user *from, unsigned long n)

{

	return __asm_copy_from_user(to, from, n);

}

static inline unsigned long

raw_copy_to_user(void __user *to, const void *from, unsigned long n)

{

	return __asm_copy_to_user(to, from, n);

}

#ifdef CONFIG_MMU

#include <linux/errno.h>

#include <linux/compiler.h>

		-EFAULT;					\

})

unsigned long __must_check __asm_copy_to_user(void __user *to,

	const void *from, unsigned long n);

unsigned long __must_check __asm_copy_from_user(void *to,

	const void __user *from, unsigned long n);

static inline unsigned long

raw_copy_from_user(void *to, const void __user *from, unsigned long n)

{

	return __asm_copy_from_user(to, from, n);

}

static inline unsigned long

raw_copy_to_user(void __user *to, const void *from, unsigned long n)

{

	return __asm_copy_to_user(to, from, n);

}

extern long strncpy_from_user(char *dest, const char __user *src, long count);

extern long __must_check strlen_user(const char __user *str);

lib-y			+= delay.o

lib-y			+= memcpy.o

lib-y			+= memset.o

lib-y			+= uaccess.o

lib-$(CONFIG_MMU)	+= uaccess.o

lib-$(CONFIG_64BIT)	+= tishift.o