s390/uaccess: consistent types

The types 'size_t' and 'unsigned long' have been used randomly for the
uaccess functions. This looks rather confusing.
So let's change all functions to use unsigned long instead and get rid
of size_t in order to have a consistent interface.

The only exception is strncpy_from_user() which uses 'long' since it
may return a signed value (-EFAULT).

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

3 files changed, 45 insertions, 44 deletions

diff --git a/arch/s390/lib/uaccess.h b/arch/s390/lib/uaccess.h
index e5b9c924..c7e0e81f 100644
--- a/arch/s390/lib/uaccess.h
+++ b/arch/s390/lib/uaccess.h
@@ -6,11 +6,11 @@
 #ifndef __ARCH_S390_LIB_UACCESS_H
 #define __ARCH_S390_LIB_UACCESS_H
 
-size_t copy_from_user_pt(void *to, const void __user *from, size_t n);
-size_t copy_to_user_pt(void __user *to, const void *from, size_t n);
-size_t copy_in_user_pt(void __user *to, const void __user *from, size_t n);
-size_t clear_user_pt(void __user *to, size_t n);
-size_t strnlen_user_pt(const char __user *src, size_t count);
-size_t strncpy_from_user_pt(char *dst, const char __user *src, size_t count);
+unsigned long copy_from_user_pt(void *to, const void __user *from, unsigned long n);
+unsigned long copy_to_user_pt(void __user *to, const void *from, unsigned long n);
+unsigned long copy_in_user_pt(void __user *to, const void __user *from, unsigned long n);
+unsigned long clear_user_pt(void __user *to, unsigned long n);
+unsigned long strnlen_user_pt(const char __user *src, unsigned long count);
+long strncpy_from_user_pt(char *dst, const char __user *src, long count);
 
 #endif /* __ARCH_S390_LIB_UACCESS_H */
diff --git a/arch/s390/lib/uaccess_mvcos.c b/arch/s390/lib/uaccess_mvcos.c
index 66f35e1..8c01f3a 100644
--- a/arch/s390/lib/uaccess_mvcos.c
+++ b/arch/s390/lib/uaccess_mvcos.c
@@ -30,8 +30,8 @@
 
 static struct static_key have_mvcos = STATIC_KEY_INIT_TRUE;
 
-static inline size_t copy_from_user_mvcos(void *x, const void __user *ptr,
-					  size_t size)
+static inline unsigned long copy_from_user_mvcos(void *x, const void __user *ptr,
+						 unsigned long size)
 {
 	register unsigned long reg0 asm("0") = 0x81UL;
 	unsigned long tmp1, tmp2;
@@ -70,7 +70,7 @@ static inline size_t copy_from_user_mvcos(void *x, const void __user *ptr,
 	return size;
 }
 
-size_t __copy_from_user(void *to, const void __user *from, size_t n)
+unsigned long __copy_from_user(void *to, const void __user *from, unsigned long n)
 {
 	if (static_key_true(&have_mvcos))
 		return copy_from_user_mvcos(to, from, n);
@@ -78,8 +78,8 @@ size_t __copy_from_user(void *to, const void __user *from, size_t n)
 }
 EXPORT_SYMBOL(__copy_from_user);
 
-static inline size_t copy_to_user_mvcos(void __user *ptr, const void *x,
-					size_t size)
+static inline unsigned long copy_to_user_mvcos(void __user *ptr, const void *x,
+					       unsigned long size)
 {
 	register unsigned long reg0 asm("0") = 0x810000UL;
 	unsigned long tmp1, tmp2;
@@ -108,7 +108,7 @@ static inline size_t copy_to_user_mvcos(void __user *ptr, const void *x,
 	return size;
 }
 
-size_t __copy_to_user(void __user *to, const void *from, size_t n)
+unsigned long __copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	if (static_key_true(&have_mvcos))
 		return copy_to_user_mvcos(to, from, n);
@@ -116,8 +116,8 @@ size_t __copy_to_user(void __user *to, const void *from, size_t n)
 }
 EXPORT_SYMBOL(__copy_to_user);
 
-static inline size_t copy_in_user_mvcos(void __user *to, const void __user *from,
-					size_t size)
+static inline unsigned long copy_in_user_mvcos(void __user *to, const void __user *from,
+					       unsigned long size)
 {
 	register unsigned long reg0 asm("0") = 0x810081UL;
 	unsigned long tmp1, tmp2;
@@ -139,7 +139,7 @@ static inline size_t copy_in_user_mvcos(void __user *to, const void __user *from
 	return size;
 }
 
-size_t __copy_in_user(void __user *to, const void __user *from, size_t n)
+unsigned long __copy_in_user(void __user *to, const void __user *from, unsigned long n)
 {
 	if (static_key_true(&have_mvcos))
 		return copy_in_user_mvcos(to, from, n);
@@ -147,7 +147,7 @@ size_t __copy_in_user(void __user *to, const void __user *from, size_t n)
 }
 EXPORT_SYMBOL(__copy_in_user);
 
-static inline size_t clear_user_mvcos(void __user *to, size_t size)
+static inline unsigned long clear_user_mvcos(void __user *to, unsigned long size)
 {
 	register unsigned long reg0 asm("0") = 0x810000UL;
 	unsigned long tmp1, tmp2;
@@ -175,7 +175,7 @@ static inline size_t clear_user_mvcos(void __user *to, size_t size)
 	return size;
 }
 
-size_t __clear_user(void __user *to, size_t size)
+unsigned long __clear_user(void __user *to, unsigned long size)
 {
 	if (static_key_true(&have_mvcos))
 		return clear_user_mvcos(to, size);
@@ -183,14 +183,15 @@ size_t __clear_user(void __user *to, size_t size)
 }
 EXPORT_SYMBOL(__clear_user);
 
-static inline size_t strnlen_user_mvcos(const char __user *src, size_t count)
+static inline unsigned long strnlen_user_mvcos(const char __user *src,
+					       unsigned long count)
 {
-	size_t done, len, offset, len_str;
+	unsigned long done, len, offset, len_str;
 	char buf[256];
 
 	done = 0;
 	do {
-		offset = (size_t)src & ~PAGE_MASK;
+		offset = (unsigned long)src & ~PAGE_MASK;
 		len = min(256UL, PAGE_SIZE - offset);
 		len = min(count - done, len);
 		if (copy_from_user_mvcos(buf, src, len))
@@ -202,7 +203,7 @@ static inline size_t strnlen_user_mvcos(const char __user *src, size_t count)
 	return done + 1;
 }
 
-size_t __strnlen_user(const char __user *src, size_t count)
+unsigned long __strnlen_user(const char __user *src, unsigned long count)
 {
 	if (static_key_true(&have_mvcos))
 		return strnlen_user_mvcos(src, count);
@@ -210,16 +211,16 @@ size_t __strnlen_user(const char __user *src, size_t count)
 }
 EXPORT_SYMBOL(__strnlen_user);
 
-static inline size_t strncpy_from_user_mvcos(char *dst, const char __user *src,
-					     size_t count)
+static inline long strncpy_from_user_mvcos(char *dst, const char __user *src,
+					   long count)
 {
 	unsigned long done, len, offset, len_str;
 
-	if (unlikely(!count))
+	if (unlikely(count <= 0))
 		return 0;
 	done = 0;
 	do {
-		offset = (size_t)src & ~PAGE_MASK;
+		offset = (unsigned long)src & ~PAGE_MASK;
 		len = min(count - done, PAGE_SIZE - offset);
 		if (copy_from_user_mvcos(dst, src, len))
 			return -EFAULT;
diff --git a/arch/s390/lib/uaccess_pt.c b/arch/s390/lib/uaccess_pt.c
index b49c3a4..8d39760 100644
--- a/arch/s390/lib/uaccess_pt.c
+++ b/arch/s390/lib/uaccess_pt.c
@@ -22,7 +22,7 @@
 #define SLR	"slgr"
 #endif
 
-static size_t strnlen_kernel(const char __user *src, size_t count)
+static unsigned long strnlen_kernel(const char __user *src, unsigned long count)
 {
 	register unsigned long reg0 asm("0") = 0UL;
 	unsigned long tmp1, tmp2;
@@ -42,8 +42,8 @@ static size_t strnlen_kernel(const char __user *src, size_t count)
 	return count;
 }
 
-static size_t copy_in_kernel(void __user *to, const void __user *from,
-			     size_t count)
+static unsigned long copy_in_kernel(void __user *to, const void __user *from,
+				    unsigned long count)
 {
 	unsigned long tmp1;
 
@@ -146,8 +146,8 @@ static unsigned long follow_table(struct mm_struct *mm,
 
 #endif /* CONFIG_64BIT */
 
-static __always_inline size_t __user_copy_pt(unsigned long uaddr, void *kptr,
-					     size_t n, int write_user)
+static inline unsigned long __user_copy_pt(unsigned long uaddr, void *kptr,
+					   unsigned long n, int write_user)
 {
 	struct mm_struct *mm = current->mm;
 	unsigned long offset, done, size, kaddr;
@@ -189,8 +189,7 @@ fault:
  * Do DAT for user address by page table walk, return kernel address.
  * This function needs to be called with current->mm->page_table_lock held.
  */
-static __always_inline unsigned long __dat_user_addr(unsigned long uaddr,
-						     int write)
+static inline unsigned long __dat_user_addr(unsigned long uaddr, int write)
 {
 	struct mm_struct *mm = current->mm;
 	unsigned long kaddr;
@@ -211,9 +210,9 @@ fault:
 	return 0;
 }
 
-size_t copy_from_user_pt(void *to, const void __user *from, size_t n)
+unsigned long copy_from_user_pt(void *to, const void __user *from, unsigned long n)
 {
-	size_t rc;
+	unsigned long rc;
 
 	if (segment_eq(get_fs(), KERNEL_DS))
 		return copy_in_kernel((void __user *) to, from, n);
@@ -223,17 +222,17 @@ size_t copy_from_user_pt(void *to, const void __user *from, size_t n)
 	return rc;
 }
 
-size_t copy_to_user_pt(void __user *to, const void *from, size_t n)
+unsigned long copy_to_user_pt(void __user *to, const void *from, unsigned long n)
 {
 	if (segment_eq(get_fs(), KERNEL_DS))
 		return copy_in_kernel(to, (void __user *) from, n);
 	return __user_copy_pt((unsigned long) to, (void *) from, n, 1);
 }
 
-size_t clear_user_pt(void __user *to, size_t n)
+unsigned long clear_user_pt(void __user *to, unsigned long n)
 {
 	void *zpage = (void *) empty_zero_page;
-	long done, size, ret;
+	unsigned long done, size, ret;
 
 	done = 0;
 	do {
@@ -253,12 +252,12 @@ size_t clear_user_pt(void __user *to, size_t n)
 	return 0;
 }
 
-size_t strnlen_user_pt(const char __user *src, size_t count)
+unsigned long strnlen_user_pt(const char __user *src, unsigned long count)
 {
 	unsigned long uaddr = (unsigned long) src;
 	struct mm_struct *mm = current->mm;
 	unsigned long offset, done, len, kaddr;
-	size_t len_str;
+	unsigned long len_str;
 
 	if (unlikely(!count))
 		return 0;
@@ -289,15 +288,15 @@ fault:
 	goto retry;
 }
 
-size_t strncpy_from_user_pt(char *dst, const char __user *src, size_t count)
+long strncpy_from_user_pt(char *dst, const char __user *src, long count)
 {
-	size_t done, len, offset, len_str;
+	unsigned long done, len, offset, len_str;
 
-	if (unlikely(!count))
+	if (unlikely(count <= 0))
 		return 0;
 	done = 0;
 	do {
-		offset = (size_t)src & ~PAGE_MASK;
+		offset = (unsigned long)src & ~PAGE_MASK;
 		len = min(count - done, PAGE_SIZE - offset);
 		if (segment_eq(get_fs(), KERNEL_DS)) {
 			if (copy_in_kernel((void __user *) dst, src, len))
@@ -314,7 +313,8 @@ size_t strncpy_from_user_pt(char *dst, const char __user *src, size_t count)
 	return done;
 }
 
-size_t copy_in_user_pt(void __user *to, const void __user *from, size_t n)
+unsigned long copy_in_user_pt(void __user *to, const void __user *from,
+			      unsigned long n)
 {
 	struct mm_struct *mm = current->mm;
 	unsigned long offset_max, uaddr, done, size, error_code;