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>

5 files changed, 57 insertions, 56 deletions

diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index 49885a518e5e..2710b41eed22 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -111,8 +111,8 @@ int __handle_fault(unsigned long, unsigned long, int);
  * If some data could not be copied, this function will pad the copied
  * data to the requested size using zero bytes.
  */
-size_t __must_check __copy_from_user(void *to, const void __user *from,
-                                     size_t n);
+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.
@@ -134,13 +134,13 @@ unsigned long __must_check __copy_to_user(void __user *to, const void *from,
 #define __copy_to_user_inatomic __copy_to_user
 #define __copy_from_user_inatomic __copy_from_user
 
-static inline int __put_user_fn(void *x, void __user *ptr, size_t size)
+static inline int __put_user_fn(void *x, void __user *ptr, unsigned long size)
 {
         size = __copy_to_user(ptr, x, size);
         return size ? -EFAULT : 0;
 }
 
-static inline int __get_user_fn(void *x, const void __user *ptr, size_t size)
+static inline int __get_user_fn(void *x, const void __user *ptr, unsigned long size)
 {
         size = __copy_from_user(x, ptr, size);
         return size ? -EFAULT : 0;
@@ -308,9 +308,9 @@ strncpy_from_user(char *dst, const char __user *src, long count)
         return __strncpy_from_user(dst, src, count);
 }
 
-size_t __must_check __strnlen_user(const char __user *src, size_t count);
+unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count);
 
-static inline size_t strnlen_user(const char __user *src, size_t n)
+static inline unsigned long strnlen_user(const char __user *src, unsigned long n)
 {
         might_fault();
         return __strnlen_user(src, n);
@@ -335,15 +335,15 @@ static inline size_t strnlen_user(const char __user *src, size_t n)
 /*
  * Zero Userspace
  */
-size_t __must_check __clear_user(void __user *to, size_t size);
+unsigned long __must_check __clear_user(void __user *to, unsigned long size);
 
-static inline size_t __must_check clear_user(void __user *to, size_t n)
+static inline unsigned long __must_check clear_user(void __user *to, unsigned long n)
 {
         might_fault();
         return __clear_user(to, n);
 }
 
-int copy_to_user_real(void __user *dest, void *src, size_t count);
-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);
+int copy_from_user_real(void *dest, void __user *src, unsigned long count);
 
 #endif /* __S390_UACCESS_H */
diff --git a/arch/s390/lib/uaccess.h b/arch/s390/lib/uaccess.h
index e5b9c924b733..c7e0e81f4b4e 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 66f35e15db2d..8c01f3aaf95c 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 b49c3a440a24..8d39760bae68 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;
diff --git a/arch/s390/mm/maccess.c b/arch/s390/mm/maccess.c
index d1e0e0c7a7e2..efe8ad045c7b 100644
--- a/arch/s390/mm/maccess.c
+++ b/arch/s390/mm/maccess.c
@@ -128,7 +128,7 @@ void memcpy_absolute(void *dest, void *src, size_t count)
 /*
  * Copy memory from kernel (real) to user (virtual)
  */
-int copy_to_user_real(void __user *dest, void *src, size_t count)
+int copy_to_user_real(void __user *dest, void *src, unsigned long count)
 {
         int offs = 0, size, rc;
         char *buf;
@@ -154,7 +154,7 @@ out:
 /*
  * Copy memory from user (virtual) to kernel (real)
  */
-int copy_from_user_real(void *dest, void __user *src, size_t count)
+int copy_from_user_real(void *dest, void __user *src, unsigned long count)
 {
         int offs = 0, size, rc;
         char *buf;