ptrace: cleanup arch_ptrace() on m68knommu

Use new 'regno', 'datap' variables in order to remove duplicated
expressions and unnecessary castings.  Alse remove checking @addr less
than 0 because addr is now unsigned.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/m68knommu/kernel/ptrace.c

@@ -116,60 +116,57 @@ long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	int ret;
+	int regno = addr >> 2;
+	unsigned long __user *datap = (unsigned long __user *) data;
 
 	switch (request) {
 		/* read the word at location addr in the USER area. */
 		case PTRACE_PEEKUSR: {
 			unsigned long tmp;
 
 			ret = -EIO;
-			if ((addr & 3) || addr < 0 ||
-			    addr > sizeof(struct user) - 3)
+			if ((addr & 3) || addr > sizeof(struct user) - 3)
 				break;
 
 			tmp = 0;  /* Default return condition */
-			addr = addr >> 2; /* temporary hack. */
 			ret = -EIO;
-			if (addr < 19) {
-				tmp = get_reg(child, addr);
-				if (addr == PT_SR)
+			if (regno < 19) {
+				tmp = get_reg(child, regno);
+				if (regno == PT_SR)
 					tmp >>= 16;
-			} else if (addr >= 21 && addr < 49) {
-				tmp = child->thread.fp[addr - 21];
-			} else if (addr == 49) {
+			} else if (regno >= 21 && regno < 49) {
+				tmp = child->thread.fp[regno - 21];
+			} else if (regno == 49) {
 				tmp = child->mm->start_code;
-			} else if (addr == 50) {
+			} else if (regno == 50) {
 				tmp = child->mm->start_data;
-			} else if (addr == 51) {
+			} else if (regno == 51) {
 				tmp = child->mm->end_code;
 			} else
 				break;
-			ret = put_user(tmp,(unsigned long *) data);
+			ret = put_user(tmp, datap);
 			break;
 		}
 
 		case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
 			ret = -EIO;
-			if ((addr & 3) || addr < 0 ||
-			    addr > sizeof(struct user) - 3)
+			if ((addr & 3) || addr > sizeof(struct user) - 3)
 				break;
 
-			addr = addr >> 2; /* temporary hack. */
-
-			if (addr == PT_SR) {
+			if (regno == PT_SR) {
 				data &= SR_MASK;
 				data <<= 16;
 				data |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
 			}
-			if (addr < 19) {
-				if (put_reg(child, addr, data))
+			if (regno < 19) {
+				if (put_reg(child, regno, data))
 					break;
 				ret = 0;
 				break;
 			}
-			if (addr >= 21 && addr < 48)
+			if (regno >= 21 && regno < 48)
 			{
-				child->thread.fp[addr - 21] = data;
+				child->thread.fp[regno - 21] = data;
 				ret = 0;
 			}
 			break;
@@ -181,11 +178,11 @@ long arch_ptrace(struct task_struct *child, long request,
 			    tmp = get_reg(child, i);
 			    if (i == PT_SR)
 				tmp >>= 16;
-			    if (put_user(tmp, (unsigned long *) data)) {
+			    if (put_user(tmp, datap)) {
 				ret = -EFAULT;
 				break;
 			    }
-			    data += sizeof(unsigned long);
+			    datap++;
 			}
 			ret = 0;
 			break;
@@ -195,7 +192,7 @@ long arch_ptrace(struct task_struct *child, long request,
 			int i;
 			unsigned long tmp;
 			for (i = 0; i < 19; i++) {
-			    if (get_user(tmp, (unsigned long *) data)) {
+			    if (get_user(tmp, datap)) {
 				ret = -EFAULT;
 				break;
 			    }
@@ -205,7 +202,7 @@ long arch_ptrace(struct task_struct *child, long request,
 				tmp |= get_reg(child, PT_SR) & ~(SR_MASK << 16);
 			    }
 			    put_reg(child, i, tmp);
-			    data += sizeof(unsigned long);
+			    datap++;
 			}
 			ret = 0;
 			break;
@@ -214,7 +211,7 @@ long arch_ptrace(struct task_struct *child, long request,
 #ifdef PTRACE_GETFPREGS
 		case PTRACE_GETFPREGS: { /* Get the child FPU state. */
 			ret = 0;
-			if (copy_to_user((void *)data, &child->thread.fp,
+			if (copy_to_user(datap, &child->thread.fp,
 					 sizeof(struct user_m68kfp_struct)))
 				ret = -EFAULT;
 			break;
@@ -224,16 +221,15 @@ long arch_ptrace(struct task_struct *child, long request,
 #ifdef PTRACE_SETFPREGS
 		case PTRACE_SETFPREGS: { /* Set the child FPU state. */
 			ret = 0;
-			if (copy_from_user(&child->thread.fp, (void *)data,
+			if (copy_from_user(&child->thread.fp, datap,
 					   sizeof(struct user_m68kfp_struct)))
 				ret = -EFAULT;
 			break;
 		}
 #endif
 
 	case PTRACE_GET_THREAD_AREA:
-		ret = put_user(task_thread_info(child)->tp_value,
-			       (unsigned long __user *)data);
+		ret = put_user(task_thread_info(child)->tp_value, datap);
 		break;
 
 		default: