--- zzzz-none-000/linux-3.10.107/arch/s390/include/asm/uaccess.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/s390/include/asm/uaccess.h	2021-02-04 17:41:59.000000000 +0000
@@ -92,39 +92,90 @@
 #define ARCH_HAS_SORT_EXTABLE
 #define ARCH_HAS_SEARCH_EXTABLE
 
-struct uaccess_ops {
-	size_t (*copy_from_user)(size_t, const void __user *, void *);
-	size_t (*copy_from_user_small)(size_t, const void __user *, void *);
-	size_t (*copy_to_user)(size_t, void __user *, const void *);
-	size_t (*copy_to_user_small)(size_t, void __user *, const void *);
-	size_t (*copy_in_user)(size_t, void __user *, const void __user *);
-	size_t (*clear_user)(size_t, void __user *);
-	size_t (*strnlen_user)(size_t, const char __user *);
-	size_t (*strncpy_from_user)(size_t, const char __user *, char *);
-	int (*futex_atomic_op)(int op, u32 __user *, int oparg, int *old);
-	int (*futex_atomic_cmpxchg)(u32 *, u32 __user *, u32 old, u32 new);
-};
-
-extern struct uaccess_ops uaccess;
-extern struct uaccess_ops uaccess_std;
-extern struct uaccess_ops uaccess_mvcos;
-extern struct uaccess_ops uaccess_mvcos_switch;
-extern struct uaccess_ops uaccess_pt;
+/**
+ * __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 if pagefaults are
+ *          enabled.
+ *
+ * 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.
+ */
+unsigned long __must_check __copy_from_user(void *to, const void __user *from,
+					    unsigned long n);
+
+/**
+ * __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 if pagefaults are
+ *          enabled.
+ *
+ * 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.
+ */
+unsigned long __must_check __copy_to_user(void __user *to, const void *from,
+					  unsigned long n);
+
+#define __copy_to_user_inatomic __copy_to_user
+#define __copy_from_user_inatomic __copy_from_user
+
+#ifdef CONFIG_HAVE_MARCH_Z10_FEATURES
+
+#define __put_get_user_asm(to, from, size, spec)		\
+({								\
+	register unsigned long __reg0 asm("0") = spec;		\
+	int __rc;						\
+								\
+	asm volatile(						\
+		"0:	mvcos	%1,%3,%2\n"			\
+		"1:	xr	%0,%0\n"			\
+		"2:\n"						\
+		".pushsection .fixup, \"ax\"\n"			\
+		"3:	lhi	%0,%5\n"			\
+		"	jg	2b\n"				\
+		".popsection\n"					\
+		EX_TABLE(0b,3b) EX_TABLE(1b,3b)			\
+		: "=d" (__rc), "=Q" (*(to))			\
+		: "d" (size), "Q" (*(from)),			\
+		  "d" (__reg0), "K" (-EFAULT)			\
+		: "cc");					\
+	__rc;							\
+})
+
+#define __put_user_fn(x, ptr, size) __put_get_user_asm(ptr, x, size, 0x810000UL)
+#define __get_user_fn(x, ptr, size) __put_get_user_asm(x, ptr, size, 0x81UL)
 
-extern int __handle_fault(unsigned long, unsigned long, int);
+#else /* CONFIG_HAVE_MARCH_Z10_FEATURES */
 
-static inline int __put_user_fn(size_t size, void __user *ptr, void *x)
+static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
 {
-	size = uaccess.copy_to_user_small(size, ptr, x);
-	return size ? -EFAULT : size;
+	size = __copy_to_user(ptr, x, size);
+	return size ? -EFAULT : 0;
 }
 
-static inline int __get_user_fn(size_t size, const void __user *ptr, void *x)
+static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
 {
-	size = uaccess.copy_from_user_small(size, ptr, x);
-	return size ? -EFAULT : size;
+	size = __copy_from_user(x, ptr, size);
+	return size ? -EFAULT : 0;
 }
 
+#endif /* CONFIG_HAVE_MARCH_Z10_FEATURES */
+
 /*
  * These are the main single-value transfer routines.  They automatically
  * use the right size if we just have the right pointer type.
@@ -139,8 +190,8 @@
 	case 2:							\
 	case 4:							\
 	case 8:							\
-		__pu_err = __put_user_fn(sizeof (*(ptr)),	\
-					 ptr, &__x);		\
+		__pu_err = __put_user_fn(&__x, ptr,		\
+					 sizeof(*(ptr)));	\
 		break;						\
 	default:						\
 		__put_user_bad();				\
@@ -156,7 +207,7 @@
 })
 
 
-extern int __put_user_bad(void) __attribute__((noreturn));
+int __put_user_bad(void) __attribute__((noreturn));
 
 #define __get_user(x, ptr)					\
 ({								\
@@ -165,29 +216,29 @@
 	switch (sizeof(*(ptr))) {				\
 	case 1: {						\
 		unsigned char __x = 0;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
-					 ptr, &__x);		\
+		__gu_err = __get_user_fn(&__x, ptr,		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
 	case 2: {						\
 		unsigned short __x = 0;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
-					 ptr, &__x);		\
+		__gu_err = __get_user_fn(&__x, ptr,		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
 	case 4: {						\
 		unsigned int __x = 0;				\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
-					 ptr, &__x);		\
+		__gu_err = __get_user_fn(&__x, ptr,		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
 	case 8: {						\
 		unsigned long long __x = 0;			\
-		__gu_err = __get_user_fn(sizeof (*(ptr)),	\
-					 ptr, &__x);		\
+		__gu_err = __get_user_fn(&__x, ptr,		\
+					 sizeof(*(ptr)));	\
 		(x) = *(__force __typeof__(*(ptr)) *) &__x;	\
 		break;						\
 	};							\
@@ -204,44 +255,19 @@
 	__get_user(x, ptr);					\
 })
 
-extern int __get_user_bad(void) __attribute__((noreturn));
+int __get_user_bad(void) __attribute__((noreturn));
 
 #define __put_user_unaligned __put_user
 #define __get_user_unaligned __get_user
 
 /**
- * __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 __must_check
-__copy_to_user(void __user *to, const void *from, unsigned long n)
-{
-	if (__builtin_constant_p(n) && (n <= 256))
-		return uaccess.copy_to_user_small(n, to, from);
-	else
-		return uaccess.copy_to_user(n, to, from);
-}
-
-#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.
+ * Context: User context only. This function may sleep if pagefaults are
+ *          enabled.
  *
  * Copy data from kernel space to user space.
  *
@@ -255,33 +281,7 @@
 	return __copy_to_user(to, from, n);
 }
 
-/**
- * __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 __must_check
-__copy_from_user(void *to, const void __user *from, unsigned long n)
-{
-	if (__builtin_constant_p(n) && (n <= 256))
-		return uaccess.copy_from_user_small(n, from, to);
-	else
-		return uaccess.copy_from_user(n, from, to);
-}
-
-extern void copy_from_user_overflow(void)
+void copy_from_user_overflow(void)
 #ifdef CONFIG_DEBUG_STRICT_USER_COPY_CHECKS
 __compiletime_warning("copy_from_user() buffer size is not provably correct")
 #endif
@@ -293,7 +293,8 @@
  * @from: Source address, in user space.
  * @n:    Number of bytes to copy.
  *
- * Context: User context only.  This function may sleep.
+ * Context: User context only. This function may sleep if pagefaults are
+ *          enabled.
  *
  * Copy data from user space to kernel space.
  *
@@ -316,11 +317,8 @@
 	return __copy_from_user(to, from, n);
 }
 
-static inline unsigned long __must_check
-__copy_in_user(void __user *to, const void __user *from, unsigned long n)
-{
-	return uaccess.copy_in_user(n, to, from);
-}
+unsigned long __must_check
+__copy_in_user(void __user *to, const void __user *from, unsigned long n);
 
 static inline unsigned long __must_check
 copy_in_user(void __user *to, const void __user *from, unsigned long n)
@@ -332,25 +330,30 @@
 /*
  * Copy a null terminated string from userspace.
  */
+
+long __strncpy_from_user(char *dst, const char __user *src, long count);
+
 static inline long __must_check
 strncpy_from_user(char *dst, const char __user *src, long count)
 {
 	might_fault();
-	return uaccess.strncpy_from_user(count, src, dst);
+	return __strncpy_from_user(dst, src, count);
 }
 
-static inline unsigned long
-strnlen_user(const char __user * src, unsigned long n)
+unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
+
+static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
 {
 	might_fault();
-	return uaccess.strnlen_user(n, src);
+	return __strnlen_user(src, n);
 }
 
 /**
  * strlen_user: - Get the size of a string in user space.
  * @str: The string to measure.
  *
- * Context: User context only.  This function may sleep.
+ * Context: User context only. This function may sleep if pagefaults are
+ *          enabled.
  *
  * Get the size of a NUL-terminated string in user space.
  *
@@ -365,21 +368,15 @@
 /*
  * Zero Userspace
  */
+unsigned long __must_check __clear_user(void __user *to, unsigned long size);
 
-static inline unsigned long __must_check
-__clear_user(void __user *to, unsigned long n)
-{
-	return uaccess.clear_user(n, to);
-}
-
-static inline unsigned long __must_check
-clear_user(void __user *to, unsigned long n)
+static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
 {
 	might_fault();
-	return uaccess.clear_user(n, to);
+	return __clear_user(to, n);
 }
 
-extern int copy_to_user_real(void __user *dest, void *src, size_t count);
-extern int copy_from_user_real(void *dest, void __user *src, size_t count);
+int copy_to_user_real(void __user *dest, void *src, unsigned long count);
+void s390_kernel_write(void *dst, const void *src, size_t size);
 
 #endif /* __S390_UACCESS_H */