hexagon: use generic strncpy/strnlen from_user

Remove the hexagon implementation of strncpy/strnlen and instead use
the generic version.  The hexagon version reads the data twice for
strncpy() by doing an extra strnlen(), and it apparently lacks a check
for user_addr_max().

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 2 insertions, 31 deletions

diff --git a/arch/hexagon/include/asm/uaccess.h b/arch/hexagon/include/asm/uaccess.h
index 59aa3a50744f..d950df12d8c5 100644
--- a/arch/hexagon/include/asm/uaccess.h
+++ b/arch/hexagon/include/asm/uaccess.h
@@ -57,42 +57,13 @@ unsigned long raw_copy_to_user(void __user *to, const void *from,
 __kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count);
 #define __clear_user(a, s) __clear_user_hexagon((a), (s))
 
-extern long __strnlen_user(const char __user *src, long n);
-
-static inline strnlen_user(const char __user *src, long n)
-{
-        if (!access_ok(src, 1))
-		return 0;
-
-	return __strnlen_user(src, n);
-}
-/*  get around the ifndef in asm-generic/uaccess.h  */
+extern long strnlen_user(const char __user *src, long n);
 #define strnlen_user strnlen_user
 
-static inline long strncpy_from_user(char *dst, const char __user *src, long n);
+extern long strncpy_from_user(char *dst, const char __user *src, long n)
 #define strncpy_from_user strncpy_from_user
 
 #include <asm-generic/uaccess.h>
 
-/*  Todo:  an actual accelerated version of this.  */
-static inline long strncpy_from_user(char *dst, const char __user *src, long n)
-{
-	long res = strnlen_user(src, n);
-
-	if (unlikely(!res))
-		return -EFAULT;
-
-	if (res > n) {
-		long left = raw_copy_from_user(dst, src, n);
-		if (unlikely(left))
-			memset(dst + (n - left), 0, left);
-		return n;
-	} else {
-		long left = raw_copy_from_user(dst, src, res);
-		if (unlikely(left))
-			memset(dst + (res - left), 0, left);
-		return res-1;
-	}
-}
 
 #endif