unicore32: get rid of zeroing and switch to RAW_COPY_USER

Signed-off-by: Al Viro <[e-mail]>

arch/unicore32/Kconfig

···
 	select ARCH_WANT_FRAME_POINTERS
 	select GENERIC_IOMAP
 	select MODULES_USE_ELF_REL
+	select ARCH_HAS_RAW_COPY_USER
 	help
 	  UniCore-32 is 32-bit Instruction Set Architecture,
 	  including a series of low-power-consumption RISC chip

arch/unicore32/include/asm/uaccess.h

···
 #define __access_ok(addr, size)	(__kernel_ok || __user_ok((addr), (size)))
 
 extern unsigned long __must_check
-__copy_from_user(void *to, const void __user *from, unsigned long n);
+raw_copy_from_user(void *to, const void __user *from, unsigned long n);
 extern unsigned long __must_check
-__copy_to_user(void __user *to, const void *from, unsigned long n);
+raw_copy_to_user(void __user *to, const void *from, unsigned long n);
 extern unsigned long __must_check
 __clear_user(void __user *addr, unsigned long n);
 extern unsigned long __must_check
 __strncpy_from_user(char *to, const char __user *from, unsigned long count);
 extern unsigned long
 __strnlen_user(const char __user *s, long n);
+#define INLINE_COPY_FROM_USER
+#define INLINE_COPY_TO_USER
 
 #include <asm-generic/uaccess.h>
 

arch/unicore32/kernel/ksyms.c

···
 
 EXPORT_SYMBOL(copy_page);
 
-EXPORT_SYMBOL(__copy_from_user);
-EXPORT_SYMBOL(__copy_to_user);
+EXPORT_SYMBOL(raw_copy_from_user);
+EXPORT_SYMBOL(raw_copy_to_user);
 EXPORT_SYMBOL(__clear_user);
 
 EXPORT_SYMBOL(__ashldi3);

arch/unicore32/lib/copy_from_user.S

···
 /*
  * Prototype:
  *
- *	size_t __copy_from_user(void *to, const void *from, size_t n)
+ *	size_t raw_copy_from_user(void *to, const void *from, size_t n)
  *
  * Purpose:
  *
···
 
 	.text
 
-ENTRY(__copy_from_user)
+ENTRY(raw_copy_from_user)
 
 #include "copy_template.S"
 
-ENDPROC(__copy_from_user)
+ENDPROC(raw_copy_from_user)
 
 	.pushsection .fixup,"ax"
 	.align 0
 	copy_abort_preamble
-	ldm.w	(r1, r2), [sp]+
-	sub	r3, r0, r1
-	rsub	r2, r3, r2
-	stw	r2, [sp]
-	mov	r1, #0
-	b.l	memset
-	ldw.w	r0, [sp]+, #4
+	ldm.w	(r1, r2, r3), [sp]+
+	sub	r0, r0, r1
+	rsub	r0, r0, r2
 	copy_abort_end
 	.popsection
 

arch/unicore32/lib/copy_to_user.S

···
 /*
  * Prototype:
  *
- *	size_t __copy_to_user(void *to, const void *from, size_t n)
+ *	size_t raw_copy_to_user(void *to, const void *from, size_t n)
  *
  * Purpose:
  *
···
 
 	.text
 
-WEAK(__copy_to_user)
+WEAK(raw_copy_to_user)
 
 #include "copy_template.S"
 
-ENDPROC(__copy_to_user)
+ENDPROC(raw_copy_to_user)
 
 	.pushsection .fixup,"ax"
 	.align 0