cris: get rid of zeroing

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

arch/cris/arch-v10/lib/usercopy.c

@@ -217,19 +217,17 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
     {
       __asm_copy_from_user_1 (dst, src, retn);
       n--;
+      if (retn)
+         goto exception;
     }
 
     if (((unsigned long) src & 2) && n >= 2)
     {
       __asm_copy_from_user_2 (dst, src, retn);
       n -= 2;
+      if (retn)
+         goto exception;
     }
-
-    /* We only need one check after the unalignment-adjustments, because
-       if both adjustments were done, either both or neither reference
-       had an exception.  */
-    if (retn != 0)
-      goto copy_exception_bytes;
   }
 
   /* Decide which copying method to use. */
@@ -328,7 +326,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
     n -= 4;
 
     if (retn)
-      goto copy_exception_bytes;
+      goto exception;
   }
 
   /* If we get here, there were no memory read faults.  */
@@ -356,17 +354,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
      bytes.  */
   return retn;
 
-copy_exception_bytes:
-  /* We already have "retn" bytes cleared, and need to clear the
-     remaining "n" bytes.  A non-optimized simple byte-for-byte in-line
-     memset is preferred here, since this isn't speed-critical code and
-     we'd rather have this a leaf-function than calling memset.  */
-  {
-    char *endp;
-    for (endp = dst + n; dst < endp; dst++)
-      *dst = 0;
-  }
-
+exception:
   return retn + n;
 }
 EXPORT_SYMBOL(__copy_user_zeroing);

arch/cris/arch-v32/lib/usercopy.c

@@ -184,19 +184,18 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
     {
       __asm_copy_from_user_1 (dst, src, retn);
       n--;
+      if (retn != 0)
+        goto exception;
     }
 
     if (((unsigned long) src & 2) && n >= 2)
     {
       __asm_copy_from_user_2 (dst, src, retn);
       n -= 2;
+      if (retn != 0)
+        goto exception;
     }
 
-    /* We only need one check after the unalignment-adjustments, because
-       if both adjustments were done, either both or neither reference
-       had an exception.  */
-    if (retn != 0)
-      goto copy_exception_bytes;
   }
 
   /* Movem is dirt cheap.  The overheap is low enough to always use the
@@ -279,7 +278,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
     n -= 4;
 
     if (retn)
-      goto copy_exception_bytes;
+      goto exception;
   }
 
   /* If we get here, there were no memory read faults.  */
@@ -307,17 +306,7 @@ unsigned long __copy_user_zeroing(void *pdst, const void __user *psrc,
      bytes.  */
   return retn;
 
-copy_exception_bytes:
-  /* We already have "retn" bytes cleared, and need to clear the
-     remaining "n" bytes.  A non-optimized simple byte-for-byte in-line
-     memset is preferred here, since this isn't speed-critical code and
-     we'd rather have this a leaf-function than calling memset.  */
-  {
-    char *endp;
-    for (endp = dst + n; dst < endp; dst++)
-      *dst = 0;
-  }
-
+exception:
   return retn + n;
 }
 EXPORT_SYMBOL(__copy_user_zeroing);

arch/cris/include/arch-v10/arch/uaccess.h

@@ -172,16 +172,14 @@ __do_strncpy_from_user(char *dst, const char *src, long count)
 	__asm_copy_user_cont(to, from, ret,	\
 		"	move.b [%1+],$r9\n"	\
 		"2:	move.b $r9,[%0+]\n",	\
-		"3:	addq 1,%2\n"		\
-		"	clear.b [%0+]\n",	\
+		"3:	addq 1,%2\n",		\
 		"	.dword 2b,3b\n")
 
 #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 	__asm_copy_user_cont(to, from, ret,		\
 		"	move.w [%1+],$r9\n"		\
 		"2:	move.w $r9,[%0+]\n" COPY,	\
-		"3:	addq 2,%2\n"			\
-		"	clear.w [%0+]\n" FIXUP,		\
+		"3:	addq 2,%2\n" FIXUP,		\
 		"	.dword 2b,3b\n" TENTRY)
 
 #define __asm_copy_from_user_2(to, from, ret) \
@@ -191,16 +189,14 @@ __do_strncpy_from_user(char *dst, const char *src, long count)
 	__asm_copy_from_user_2x_cont(to, from, ret,	\
 		"	move.b [%1+],$r9\n"		\
 		"4:	move.b $r9,[%0+]\n",		\
-		"5:	addq 1,%2\n"			\
-		"	clear.b [%0+]\n",		\
+		"5:	addq 1,%2\n",			\
 		"	.dword 4b,5b\n")
 
 #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
 	__asm_copy_user_cont(to, from, ret,		\
 		"	move.d [%1+],$r9\n"		\
 		"2:	move.d $r9,[%0+]\n" COPY,	\
-		"3:	addq 4,%2\n"			\
-		"	clear.d [%0+]\n" FIXUP,		\
+		"3:	addq 4,%2\n" FIXUP,		\
 		"	.dword 2b,3b\n" TENTRY)
 
 #define __asm_copy_from_user_4(to, from, ret) \

arch/cris/include/arch-v32/arch/uaccess.h

@@ -178,8 +178,7 @@ __do_strncpy_from_user(char *dst, const char *src, long count)
 		"2:	move.b [%1+],$acr\n"	\
 		"	move.b $acr,[%0+]\n",	\
 		"3:	addq 1,%2\n"		\
-		"	jump 1b\n"		\
-		"	clear.b [%0+]\n",	\
+		"	jump 1b\n",		\
 		"	.dword 2b,3b\n")
 
 #define __asm_copy_from_user_2x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
@@ -189,8 +188,7 @@ __do_strncpy_from_user(char *dst, const char *src, long count)
 		"	move.w $acr,[%0+]\n",		\
 			FIXUP				\
 		"3:	addq 2,%2\n"			\
-		"	jump 1b\n"			\
-		"	clear.w [%0+]\n",		\
+		"	jump 1b\n",			\
 			TENTRY				\
 		"	.dword 2b,3b\n")
 
@@ -201,8 +199,7 @@ __do_strncpy_from_user(char *dst, const char *src, long count)
 	__asm_copy_from_user_2x_cont(to, from, ret,	\
 		"4:	move.b [%1+],$acr\n"		\
 		"	move.b $acr,[%0+]\n",		\
-		"5:	addq 1,%2\n"			\
-		"	clear.b [%0+]\n",		\
+		"5:	addq 1,%2\n",			\
 		"	.dword 4b,5b\n")
 
 #define __asm_copy_from_user_4x_cont(to, from, ret, COPY, FIXUP, TENTRY) \
@@ -212,8 +209,7 @@ __do_strncpy_from_user(char *dst, const char *src, long count)
 		"	move.d $acr,[%0+]\n",		\
 			FIXUP				\
 		"3:	addq 4,%2\n"			\
-		"	jump 1b\n"			\
-		"	clear.d [%0+]\n",		\
+		"	jump 1b\n",			\
 			TENTRY				\
 		"	.dword 2b,3b\n")