s390/uaccess: remove pointless access_ok() checks

access_ok() always returns 'true' on s390. Therefore all calls
are quite pointless and can be removed.

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

1 files changed, 5 insertions, 18 deletions

diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index 34268df959a3..9c33ed4e666f 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -252,9 +252,7 @@ static inline unsigned long __must_check
 copy_to_user(void __user *to, const void *from, unsigned long n)
 {
         might_fault();
-        if (access_ok(VERIFY_WRITE, to, n))
-                n = __copy_to_user(to, from, n);
-        return n;
+        return __copy_to_user(to, from, n);
 }
 
 /**
@@ -315,11 +313,7 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
                 copy_from_user_overflow();
                 return n;
         }
-        if (access_ok(VERIFY_READ, from, n))
-                n = __copy_from_user(to, from, n);
-        else
-                memset(to, 0, n);
-        return n;
+        return __copy_from_user(to, from, n);
 }
 
 static inline unsigned long __must_check
@@ -332,9 +326,7 @@ static inline unsigned long __must_check
 copy_in_user(void __user *to, const void __user *from, unsigned long n)
 {
         might_fault();
-        if (__access_ok(from,n) && __access_ok(to,n))
-                n = __copy_in_user(to, from, n);
-        return n;
+        return __copy_in_user(to, from, n);
 }
 
 /*
@@ -343,11 +335,8 @@ copy_in_user(void __user *to, const void __user *from, unsigned long n)
 static inline long __must_check
 strncpy_from_user(char *dst, const char __user *src, long count)
 {
-        long res = -EFAULT;
         might_fault();
-        if (access_ok(VERIFY_READ, src, 1))
-                res = uaccess.strncpy_from_user(count, src, dst);
-        return res;
+        return uaccess.strncpy_from_user(count, src, dst);
 }
 
 static inline unsigned long
@@ -387,9 +376,7 @@ static inline unsigned long __must_check
 clear_user(void __user *to, unsigned long n)
 {
         might_fault();
-        if (access_ok(VERIFY_WRITE, to, n))
-                n = uaccess.clear_user(n, to);
-        return n;
+        return uaccess.clear_user(n, to);
 }
 
 extern int copy_to_user_real(void __user *dest, void *src, size_t count);