nios2: use generic strncpy_from_user() and strnlen_user()
This change enables the generic strncpy_from_user() and strnlen_user()
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig
index 51a56c8..a72d5f0 100644
--- a/arch/nios2/Kconfig
+++ b/arch/nios2/Kconfig
@@ -6,6 +6,8 @@
select GENERIC_CPU_DEVICES
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
+ select GENERIC_STRNCPY_FROM_USER
+ select GENERIC_STRNLEN_USER
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_KGDB
select IRQ_DOMAIN
diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h
index 727bd95..dfa3c7c 100644
--- a/arch/nios2/include/asm/uaccess.h
+++ b/arch/nios2/include/asm/uaccess.h
@@ -42,6 +42,8 @@
# define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n"
+#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE)
+
/*
* Zero Userspace
*/
@@ -81,8 +83,9 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n);
#define INLINE_COPY_TO_USER
extern long strncpy_from_user(char *__to, const char __user *__from,
- long __len);
-extern long strnlen_user(const char __user *s, long n);
+ long __len);
+extern __must_check long strlen_user(const char __user *str);
+extern __must_check long strnlen_user(const char __user *s, long n);
/* Optimized macros */
#define __get_user_asm(val, insn, addr, err) \
diff --git a/arch/nios2/mm/uaccess.c b/arch/nios2/mm/uaccess.c
index 8049833..34f10af 100644
--- a/arch/nios2/mm/uaccess.c
+++ b/arch/nios2/mm/uaccess.c
@@ -128,36 +128,3 @@ asm(
".word 12b,13b\n"
".previous\n");
EXPORT_SYMBOL(raw_copy_to_user);
-
-long strncpy_from_user(char *__to, const char __user *__from, long __len)
-{
- int l = strnlen_user(__from, __len);
- int is_zt = 1;
-
- if (l > __len) {
- is_zt = 0;
- l = __len;
- }
-
- if (l == 0 || copy_from_user(__to, __from, l))
- return -EFAULT;
-
- if (is_zt)
- l--;
- return l;
-}
-
-long strnlen_user(const char __user *s, long n)
-{
- long i;
-
- for (i = 0; i < n; i++) {
- char c;
-
- if (get_user(c, s + i) == -EFAULT)
- return 0;
- if (c == 0)
- return i + 1;
- }
- return n + 1;
-}