include/asm-s390/uaccess.h - kernel/msm-4.19 - Gitiles

 /*
  *  include/asm-s390/uaccess.h
  *
  *  S390 version
  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
  *    Author(s): Hartmut Penner (hp@de.ibm.com),
  *               Martin Schwidefsky (schwidefsky@de.ibm.com)
  *
  *  Derived from "include/asm-i386/uaccess.h"
  */
 #ifndef __S390_UACCESS_H
 #define __S390_UACCESS_H

 /*
  * User space memory access functions
  */
 #include <linux/sched.h>
 #include <linux/errno.h>

 #define VERIFY_READ     0
 #define VERIFY_WRITE    1


 /*
  * The fs value determines whether argument validity checking should be
  * performed or not.  If get_fs() == USER_DS, checking is performed, with
  * get_fs() == KERNEL_DS, checking is bypassed.
  *
  * For historical reasons, these macros are grossly misnamed.
  */

 #define MAKE_MM_SEG(a)  ((mm_segment_t) { (a) })


 #define KERNEL_DS       MAKE_MM_SEG(0)
 #define USER_DS         MAKE_MM_SEG(1)

 #define get_ds()        (KERNEL_DS)
 #define get_fs()        (current->thread.mm_segment)

 #ifdef __s390x__
 #define set_fs(x) \
 ({									\
 	unsigned long __pto;						\
 	current->thread.mm_segment = (x);				\
 	__pto = current->thread.mm_segment.ar4 ?			\
 		S390_lowcore.user_asce : S390_lowcore.kernel_asce;	\
 	asm volatile ("lctlg 7,7,%0" : : "m" (__pto) );			\
 })
 #else
 #define set_fs(x) \
 ({									\
 	unsigned long __pto;						\
 	current->thread.mm_segment = (x);				\
 	__pto = current->thread.mm_segment.ar4 ?			\
 		S390_lowcore.user_asce : S390_lowcore.kernel_asce;	\
 	asm volatile ("lctl  7,7,%0" : : "m" (__pto) );			\
 })
 #endif

 #define segment_eq(a,b) ((a).ar4 == (b).ar4)


 #define __access_ok(addr,size) (1)

 #define access_ok(type,addr,size) __access_ok(addr,size)

 /* this function will go away soon - use access_ok() instead */
 extern inline int __deprecated verify_area(int type, const void __user *addr,
 						unsigned long size)
 {
 	return access_ok(type, addr, size) ? 0 : -EFAULT;
 }

 /*
  * The exception table consists of pairs of addresses: the first is the
  * address of an instruction that is allowed to fault, and the second is
  * the address at which the program should continue.  No registers are
  * modified, so it is entirely up to the continuation code to figure out
  * what to do.
  *
  * All the routines below use bits of fixup code that are out of line
  * with the main instruction path.  This means when everything is well,
  * we don't even have to jump over them.  Further, they do not intrude
  * on our cache or tlb entries.
  */

 struct exception_table_entry
 {
         unsigned long insn, fixup;
 };

 #ifndef __s390x__
 #define __uaccess_fixup \
 	".section .fixup,\"ax\"\n"	\
 	"2: lhi    %0,%4\n"		\
 	"   bras   1,3f\n"		\
 	"   .long  1b\n"		\
 	"3: l      1,0(1)\n"		\
 	"   br     1\n"			\
 	".previous\n"			\
 	".section __ex_table,\"a\"\n"	\
 	"   .align 4\n"			\
 	"   .long  0b,2b\n"		\
 	".previous"
 #define __uaccess_clobber "cc", "1"
 #else /* __s390x__ */
 #define __uaccess_fixup \
 	".section .fixup,\"ax\"\n"	\
 	"2: lghi   %0,%4\n"		\
 	"   jg     1b\n"		\
 	".previous\n"			\
 	".section __ex_table,\"a\"\n"	\
 	"   .align 8\n"			\
 	"   .quad  0b,2b\n"		\
 	".previous"
 #define __uaccess_clobber "cc"
 #endif /* __s390x__ */

 /*
  * These are the main single-value transfer routines.  They automatically
  * use the right size if we just have the right pointer type.
  */
 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
 #define __put_user_asm(x, ptr, err) \
 ({								\
 	err = 0;						\
 	asm volatile(						\
 		"0: mvcs  0(%1,%2),%3,%0\n"			\
 		"1:\n"						\
 		__uaccess_fixup					\
 		: "+&d" (err)					\
 		: "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x),	\
 		  "K" (-EFAULT)					\
 		: __uaccess_clobber );				\
 })
 #else
 #define __put_user_asm(x, ptr, err) \
 ({								\
 	err = 0;						\
 	asm volatile(						\
 		"0: mvcs  0(%1,%2),0(%3),%0\n"			\
 		"1:\n"						\
 		__uaccess_fixup					\
 		: "+&d" (err)					\
 		: "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)),	\
 		  "K" (-EFAULT), "m" (x)			\
 		: __uaccess_clobber );				\
 })
 #endif

 #define __put_user(x, ptr) \
 ({								\
 	__typeof__(*(ptr)) __x = (x);				\
 	int __pu_err;						\
         __chk_user_ptr(ptr);                                    \
 	switch (sizeof (*(ptr))) {				\
 	case 1:							\
 	case 2:							\
 	case 4:							\
 	case 8:							\
 		__put_user_asm(__x, ptr, __pu_err);		\
 		break;						\
 	default:						\
 		__put_user_bad();				\
 		break;						\
 	 }							\
 	__pu_err;						\
 })

 #define put_user(x, ptr)					\
 ({								\
 	might_sleep();						\
 	__put_user(x, ptr);					\
 })


 extern int __put_user_bad(void) __attribute__((noreturn));

 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
 #define __get_user_asm(x, ptr, err) \
 ({								\
 	err = 0;						\
 	asm volatile (						\
 		"0: mvcp  %O1(%2,%R1),0(%3),%0\n"		\
 		"1:\n"						\
 		__uaccess_fixup					\
 		: "+&d" (err), "=Q" (x)				\
 		: "d" (sizeof(*(ptr))), "a" (ptr),		\
 		  "K" (-EFAULT)					\
 		: __uaccess_clobber );				\
 })
 #else
 #define __get_user_asm(x, ptr, err) \
 ({								\
 	err = 0;						\
 	asm volatile (						\
 		"0: mvcp  0(%2,%5),0(%3),%0\n"			\
 		"1:\n"						\
 		__uaccess_fixup					\
 		: "+&d" (err), "=m" (x)				\
 		: "d" (sizeof(*(ptr))), "a" (ptr),		\
 		  "K" (-EFAULT), "a" (&(x))			\
 		: __uaccess_clobber );				\
 })
 #endif

 #define __get_user(x, ptr)					\
 ({								\
 	__typeof__(*(ptr)) __x;					\
 	int __gu_err;						\
         __chk_user_ptr(ptr);                                    \
 	switch (sizeof(*(ptr))) {				\
 	case 1:							\
 	case 2:							\
 	case 4:							\
 	case 8:							\
 		__get_user_asm(__x, ptr, __gu_err);		\
 		break;						\
 	default:						\
 		__get_user_bad();				\
 		break;						\
 	}							\
 	(x) = __x;						\
 	__gu_err;						\
 })

 #define get_user(x, ptr)					\
 ({								\
 	might_sleep();						\
 	__get_user(x, ptr);					\
 })

 extern int __get_user_bad(void) __attribute__((noreturn));

 #define __put_user_unaligned __put_user
 #define __get_user_unaligned __get_user

 extern long __copy_to_user_asm(const void *from, long n, void __user *to);

 /**
  * __copy_to_user: - Copy a block of data into user space, with less checking.
  * @to:   Destination address, in user space.
  * @from: Source address, in kernel space.
  * @n:    Number of bytes to copy.
  *
  * Context: User context only.  This function may sleep.
  *
  * Copy data from kernel space to user space.  Caller must check
  * the specified block with access_ok() before calling this function.
  *
  * Returns number of bytes that could not be copied.
  * On success, this will be zero.
  */
 static inline unsigned long
 __copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	return __copy_to_user_asm(from, n, to);
 }

 #define __copy_to_user_inatomic __copy_to_user
 #define __copy_from_user_inatomic __copy_from_user

 /**
  * copy_to_user: - Copy a block of data into user space.
  * @to:   Destination address, in user space.
  * @from: Source address, in kernel space.
  * @n:    Number of bytes to copy.
  *
  * Context: User context only.  This function may sleep.
  *
  * Copy data from kernel space to user space.
  *
  * Returns number of bytes that could not be copied.
  * On success, this will be zero.
  */
 static inline unsigned long
 copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	might_sleep();
 	if (access_ok(VERIFY_WRITE, to, n))
 		n = __copy_to_user(to, from, n);
 	return n;
 }

 extern long __copy_from_user_asm(void *to, long n, const void __user *from);

 /**
  * __copy_from_user: - Copy a block of data from user space, with less checking.
  * @to:   Destination address, in kernel space.
  * @from: Source address, in user space.
  * @n:    Number of bytes to copy.
  *
  * Context: User context only.  This function may sleep.
  *
  * Copy data from user space to kernel space.  Caller must check
  * the specified block with access_ok() before calling this function.
  *
  * Returns number of bytes that could not be copied.
  * On success, this will be zero.
  *
  * If some data could not be copied, this function will pad the copied
  * data to the requested size using zero bytes.
  */
 static inline unsigned long
 __copy_from_user(void *to, const void __user *from, unsigned long n)
 {
 	return __copy_from_user_asm(to, n, from);
 }

 /**
  * copy_from_user: - Copy a block of data from user space.
  * @to:   Destination address, in kernel space.
  * @from: Source address, in user space.
  * @n:    Number of bytes to copy.
  *
  * Context: User context only.  This function may sleep.
  *
  * Copy data from user space to kernel space.
  *
  * Returns number of bytes that could not be copied.
  * On success, this will be zero.
  *
  * If some data could not be copied, this function will pad the copied
  * data to the requested size using zero bytes.
  */
 static inline unsigned long
 copy_from_user(void *to, const void __user *from, unsigned long n)
 {
 	might_sleep();
 	if (access_ok(VERIFY_READ, from, n))
 		n = __copy_from_user(to, from, n);
 	else
 		memset(to, 0, n);
 	return n;
 }

 extern unsigned long __copy_in_user_asm(const void __user *from, long n,
 							void __user *to);

 static inline unsigned long
 __copy_in_user(void __user *to, const void __user *from, unsigned long n)
 {
 	return __copy_in_user_asm(from, n, to);
 }

 static inline unsigned long
 copy_in_user(void __user *to, const void __user *from, unsigned long n)
 {
 	might_sleep();
 	if (__access_ok(from,n) && __access_ok(to,n))
 		n = __copy_in_user_asm(from, n, to);
 	return n;
 }

 /*
  * Copy a null terminated string from userspace.
  */
 extern long __strncpy_from_user_asm(long count, char *dst,
 					const char __user *src);

 static inline long
 strncpy_from_user(char *dst, const char __user *src, long count)
 {
         long res = -EFAULT;
         might_sleep();
         if (access_ok(VERIFY_READ, src, 1))
                 res = __strncpy_from_user_asm(count, dst, src);
         return res;
 }


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

 static inline unsigned long
 strnlen_user(const char __user * src, unsigned long n)
 {
 	might_sleep();
 	return __strnlen_user_asm(n, src);
 }

 /**
  * strlen_user: - Get the size of a string in user space.
  * @str: The string to measure.
  *
  * Context: User context only.  This function may sleep.
  *
  * Get the size of a NUL-terminated string in user space.
  *
  * Returns the size of the string INCLUDING the terminating NUL.
  * On exception, returns 0.
  *
  * If there is a limit on the length of a valid string, you may wish to
  * consider using strnlen_user() instead.
  */
 #define strlen_user(str) strnlen_user(str, ~0UL)

 /*
  * Zero Userspace
  */

 extern long __clear_user_asm(void __user *to, long n);

 static inline unsigned long
 __clear_user(void __user *to, unsigned long n)
 {
 	return __clear_user_asm(to, n);
 }

 static inline unsigned long
 clear_user(void __user *to, unsigned long n)
 {
 	might_sleep();
 	if (access_ok(VERIFY_WRITE, to, n))
 		n = __clear_user_asm(to, n);
 	return n;
 }

 #endif /* __S390_UACCESS_H */
	/*
	* include/asm-s390/uaccess.h
	*
	* S390 version
	* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
	* Author(s): Hartmut Penner (hp@de.ibm.com),
	* Martin Schwidefsky (schwidefsky@de.ibm.com)
	*
	* Derived from "include/asm-i386/uaccess.h"
	*/
	#ifndef __S390_UACCESS_H
	#define __S390_UACCESS_H

	/*
	* User space memory access functions
	*/
	#include <linux/sched.h>
	#include <linux/errno.h>

	#define VERIFY_READ 0
	#define VERIFY_WRITE 1


	/*
	* The fs value determines whether argument validity checking should be
	* performed or not. If get_fs() == USER_DS, checking is performed, with
	* get_fs() == KERNEL_DS, checking is bypassed.
	*
	* For historical reasons, these macros are grossly misnamed.
	*/

	#define MAKE_MM_SEG(a) ((mm_segment_t) { (a) })


	#define KERNEL_DS MAKE_MM_SEG(0)
	#define USER_DS MAKE_MM_SEG(1)

	#define get_ds() (KERNEL_DS)
	#define get_fs() (current->thread.mm_segment)

	#ifdef __s390x__
	#define set_fs(x) \
	({ \
	unsigned long __pto; \
	current->thread.mm_segment = (x); \
	__pto = current->thread.mm_segment.ar4 ? \
	S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
	asm volatile ("lctlg 7,7,%0" : : "m" (__pto) ); \
	})
	#else
	#define set_fs(x) \
	({ \
	unsigned long __pto; \
	current->thread.mm_segment = (x); \
	__pto = current->thread.mm_segment.ar4 ? \
	S390_lowcore.user_asce : S390_lowcore.kernel_asce; \
	asm volatile ("lctl 7,7,%0" : : "m" (__pto) ); \
	})
	#endif

	#define segment_eq(a,b) ((a).ar4 == (b).ar4)


	#define __access_ok(addr,size) (1)

	#define access_ok(type,addr,size) __access_ok(addr,size)

	/* this function will go away soon - use access_ok() instead */
	extern inline int __deprecated verify_area(int type, const void __user *addr,
	unsigned long size)
	{
	return access_ok(type, addr, size) ? 0 : -EFAULT;
	}

	/*
	* The exception table consists of pairs of addresses: the first is the
	* address of an instruction that is allowed to fault, and the second is
	* the address at which the program should continue. No registers are
	* modified, so it is entirely up to the continuation code to figure out
	* what to do.
	*
	* All the routines below use bits of fixup code that are out of line
	* with the main instruction path. This means when everything is well,
	* we don't even have to jump over them. Further, they do not intrude
	* on our cache or tlb entries.
	*/

	struct exception_table_entry
	{
	unsigned long insn, fixup;
	};

	#ifndef __s390x__
	#define __uaccess_fixup \
	".section .fixup,\"ax\"\n" \
	"2: lhi %0,%4\n" \
	" bras 1,3f\n" \
	" .long 1b\n" \
	"3: l 1,0(1)\n" \
	" br 1\n" \
	".previous\n" \
	".section __ex_table,\"a\"\n" \
	" .align 4\n" \
	" .long 0b,2b\n" \
	".previous"
	#define __uaccess_clobber "cc", "1"
	#else /* __s390x__ */
	#define __uaccess_fixup \
	".section .fixup,\"ax\"\n" \
	"2: lghi %0,%4\n" \
	" jg 1b\n" \
	".previous\n" \
	".section __ex_table,\"a\"\n" \
	" .align 8\n" \
	" .quad 0b,2b\n" \
	".previous"
	#define __uaccess_clobber "cc"
	#endif /* __s390x__ */

	/*
	* These are the main single-value transfer routines. They automatically
	* use the right size if we just have the right pointer type.
	*/
	#if __GNUC__ > 3 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
	#define __put_user_asm(x, ptr, err) \
	({ \
	err = 0; \
	asm volatile( \
	"0: mvcs 0(%1,%2),%3,%0\n" \
	"1:\n" \
	__uaccess_fixup \
	: "+&d" (err) \
	: "d" (sizeof(*(ptr))), "a" (ptr), "Q" (x), \
	"K" (-EFAULT) \
	: __uaccess_clobber ); \
	})
	#else
	#define __put_user_asm(x, ptr, err) \
	({ \
	err = 0; \
	asm volatile( \
	"0: mvcs 0(%1,%2),0(%3),%0\n" \
	"1:\n" \
	__uaccess_fixup \
	: "+&d" (err) \
	: "d" (sizeof(*(ptr))), "a" (ptr), "a" (&(x)), \
	"K" (-EFAULT), "m" (x) \
	: __uaccess_clobber ); \
	})
	#endif

	#define __put_user(x, ptr) \
	({ \
	__typeof__(*(ptr)) __x = (x); \
	int __pu_err; \
	__chk_user_ptr(ptr); \
	switch (sizeof (*(ptr))) { \
	case 1: \
	case 2: \
	case 4: \
	case 8: \
	__put_user_asm(__x, ptr, __pu_err); \
	break; \
	default: \
	__put_user_bad(); \
	break; \
	} \
	__pu_err; \
	})

	#define put_user(x, ptr) \
	({ \
	might_sleep(); \
	__put_user(x, ptr); \
	})


	extern int __put_user_bad(void) __attribute__((noreturn));

	#if __GNUC__ > 3 \|\| (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
	#define __get_user_asm(x, ptr, err) \
	({ \
	err = 0; \
	asm volatile ( \
	"0: mvcp %O1(%2,%R1),0(%3),%0\n" \
	"1:\n" \
	__uaccess_fixup \
	: "+&d" (err), "=Q" (x) \
	: "d" (sizeof(*(ptr))), "a" (ptr), \
	"K" (-EFAULT) \
	: __uaccess_clobber ); \
	})
	#else
	#define __get_user_asm(x, ptr, err) \
	({ \
	err = 0; \
	asm volatile ( \
	"0: mvcp 0(%2,%5),0(%3),%0\n" \
	"1:\n" \
	__uaccess_fixup \
	: "+&d" (err), "=m" (x) \
	: "d" (sizeof(*(ptr))), "a" (ptr), \
	"K" (-EFAULT), "a" (&(x)) \
	: __uaccess_clobber ); \
	})
	#endif

	#define __get_user(x, ptr) \
	({ \
	__typeof__(*(ptr)) __x; \
	int __gu_err; \
	__chk_user_ptr(ptr); \
	switch (sizeof(*(ptr))) { \
	case 1: \
	case 2: \
	case 4: \
	case 8: \
	__get_user_asm(__x, ptr, __gu_err); \
	break; \
	default: \
	__get_user_bad(); \
	break; \
	} \
	(x) = __x; \
	__gu_err; \
	})

	#define get_user(x, ptr) \
	({ \
	might_sleep(); \
	__get_user(x, ptr); \
	})

	extern int __get_user_bad(void) __attribute__((noreturn));

	#define __put_user_unaligned __put_user
	#define __get_user_unaligned __get_user

	extern long __copy_to_user_asm(const void from, long n, void __user to);

	/**
	* __copy_to_user: - Copy a block of data into user space, with less checking.
	* @to: Destination address, in user space.
	* @from: Source address, in kernel space.
	* @n: Number of bytes to copy.
	*
	* Context: User context only. This function may sleep.
	*
	* Copy data from kernel space to user space. Caller must check
	* the specified block with access_ok() before calling this function.
	*
	* Returns number of bytes that could not be copied.
	* On success, this will be zero.
	*/
	static inline unsigned long
	__copy_to_user(void __user to, const void from, unsigned long n)
	{
	return __copy_to_user_asm(from, n, to);
	}

	#define __copy_to_user_inatomic __copy_to_user
	#define __copy_from_user_inatomic __copy_from_user

	/**
	* copy_to_user: - Copy a block of data into user space.
	* @to: Destination address, in user space.
	* @from: Source address, in kernel space.
	* @n: Number of bytes to copy.
	*
	* Context: User context only. This function may sleep.
	*
	* Copy data from kernel space to user space.
	*
	* Returns number of bytes that could not be copied.
	* On success, this will be zero.
	*/
	static inline unsigned long
	copy_to_user(void __user to, const void from, unsigned long n)
	{
	might_sleep();
	if (access_ok(VERIFY_WRITE, to, n))
	n = __copy_to_user(to, from, n);
	return n;
	}

	extern long __copy_from_user_asm(void to, long n, const void __user from);

	/**
	* __copy_from_user: - Copy a block of data from user space, with less checking.
	* @to: Destination address, in kernel space.
	* @from: Source address, in user space.
	* @n: Number of bytes to copy.
	*
	* Context: User context only. This function may sleep.
	*
	* Copy data from user space to kernel space. Caller must check
	* the specified block with access_ok() before calling this function.
	*
	* Returns number of bytes that could not be copied.
	* On success, this will be zero.
	*
	* If some data could not be copied, this function will pad the copied
	* data to the requested size using zero bytes.
	*/
	static inline unsigned long
	__copy_from_user(void to, const void __user from, unsigned long n)
	{
	return __copy_from_user_asm(to, n, from);
	}

	/**
	* copy_from_user: - Copy a block of data from user space.
	* @to: Destination address, in kernel space.
	* @from: Source address, in user space.
	* @n: Number of bytes to copy.
	*
	* Context: User context only. This function may sleep.
	*
	* Copy data from user space to kernel space.
	*
	* Returns number of bytes that could not be copied.
	* On success, this will be zero.
	*
	* If some data could not be copied, this function will pad the copied
	* data to the requested size using zero bytes.
	*/
	static inline unsigned long
	copy_from_user(void to, const void __user from, unsigned long n)
	{
	might_sleep();
	if (access_ok(VERIFY_READ, from, n))
	n = __copy_from_user(to, from, n);
	else
	memset(to, 0, n);
	return n;
	}

	extern unsigned long __copy_in_user_asm(const void __user *from, long n,
	void __user *to);

	static inline unsigned long
	__copy_in_user(void __user to, const void __user from, unsigned long n)
	{
	return __copy_in_user_asm(from, n, to);
	}

	static inline unsigned long
	copy_in_user(void __user to, const void __user from, unsigned long n)
	{
	might_sleep();
	if (__access_ok(from,n) && __access_ok(to,n))
	n = __copy_in_user_asm(from, n, to);
	return n;
	}

	/*
	* Copy a null terminated string from userspace.
	*/
	extern long __strncpy_from_user_asm(long count, char *dst,
	const char __user *src);

	static inline long
	strncpy_from_user(char dst, const char __user src, long count)
	{
	long res = -EFAULT;
	might_sleep();
	if (access_ok(VERIFY_READ, src, 1))
	res = __strncpy_from_user_asm(count, dst, src);
	return res;
	}


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

	static inline unsigned long
	strnlen_user(const char __user * src, unsigned long n)
	{
	might_sleep();
	return __strnlen_user_asm(n, src);
	}

	/**
	* strlen_user: - Get the size of a string in user space.
	* @str: The string to measure.
	*
	* Context: User context only. This function may sleep.
	*
	* Get the size of a NUL-terminated string in user space.
	*
	* Returns the size of the string INCLUDING the terminating NUL.
	* On exception, returns 0.
	*
	* If there is a limit on the length of a valid string, you may wish to
	* consider using strnlen_user() instead.
	*/
	#define strlen_user(str) strnlen_user(str, ~0UL)

	/*
	* Zero Userspace
	*/

	extern long __clear_user_asm(void __user *to, long n);

	static inline unsigned long
	__clear_user(void __user *to, unsigned long n)
	{
	return __clear_user_asm(to, n);
	}

	static inline unsigned long
	clear_user(void __user *to, unsigned long n)
	{
	might_sleep();
	if (access_ok(VERIFY_WRITE, to, n))
	n = __clear_user_asm(to, n);
	return n;
	}

	#endif /* __S390_UACCESS_H */