avr32: switch to RAW_COPY_USER

This one needs profiling; use of asm variant of access_ok() might have
been performance-critical.  Now copy_{to,from}_user() are using the
C variant.  I doubt that it's going to have visible effects, but
that needs to be experimentally verified.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/avr32/Kconfig

@@ -19,6 +19,7 @@ config AVR32
 	select HAVE_MOD_ARCH_SPECIFIC
 	select MODULES_USE_ELF_RELA
 	select HAVE_NMI
+	select ARCH_HAS_RAW_COPY_USER
 	help
 	  AVR32 is a high-performance 32-bit RISC microprocessor core,
 	  designed for cost-sensitive embedded applications, with particular

arch/avr32/include/asm/uaccess.h

@@ -66,34 +66,18 @@ static inline void set_fs(mm_segment_t s)
 extern __kernel_size_t __copy_user(void *to, const void *from,
 				   __kernel_size_t n);
 
-extern __kernel_size_t copy_to_user(void __user *to, const void *from,
-				    __kernel_size_t n);
-extern __kernel_size_t ___copy_from_user(void *to, const void __user *from,
-				      __kernel_size_t n);
-
-static inline __kernel_size_t __copy_to_user(void __user *to, const void *from,
-					     __kernel_size_t n)
+static inline unsigned long
+raw_copy_to_user(void __user *to, const void *from, unsigned long n)
 {
 	return __copy_user((void __force *)to, from, n);
 }
-static inline __kernel_size_t __copy_from_user(void *to,
-					       const void __user *from,
-					       __kernel_size_t n)
+static inline unsigned long
+raw_copy_from_user(void *to, const void __user *from, unsigned long n)
 {
 	return __copy_user(to, (const void __force *)from, n);
 }
-static inline __kernel_size_t copy_from_user(void *to,
-					       const void __user *from,
-					       __kernel_size_t n)
-{
-	size_t res = ___copy_from_user(to, from, n);
-	if (unlikely(res))
-		memset(to + (n - res), 0, res);
-	return res;
-}
-
-#define __copy_to_user_inatomic __copy_to_user
-#define __copy_from_user_inatomic __copy_from_user
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
 
 /*
  * put_user: - Write a simple value into user space.

arch/avr32/kernel/avr32_ksyms.c

@@ -36,8 +36,6 @@ EXPORT_SYMBOL(copy_page);
 /*
  * Userspace access stuff.
  */
-EXPORT_SYMBOL(___copy_from_user);
-EXPORT_SYMBOL(copy_to_user);
 EXPORT_SYMBOL(__copy_user);
 EXPORT_SYMBOL(strncpy_from_user);
 EXPORT_SYMBOL(__strncpy_from_user);

arch/avr32/lib/copy_user.S

@@ -23,21 +23,6 @@
 	 */
 	.text
 	.align	1
-	.global	___copy_from_user
-	.type	___copy_from_user, @function
-___copy_from_user:
-	branch_if_kernel r8, __copy_user
-	ret_if_privileged r8, r11, r10, r10
-	rjmp	__copy_user
-	.size	___copy_from_user, . - ___copy_from_user
-
-	.global	copy_to_user
-	.type	copy_to_user, @function
-copy_to_user:
-	branch_if_kernel r8, __copy_user
-	ret_if_privileged r8, r12, r10, r10
-	.size	copy_to_user, . - copy_to_user
-
 	.global	__copy_user
 	.type	__copy_user, @function
 __copy_user: