linux-kernel - [RFC PATCH 08/43] ptrace, arm: cleanup arch

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Message-Id: <1282902149-12991-9-git-send-email-namhyung@gmail.com>
Date:	Fri, 27 Aug 2010 18:41:54 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>, Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel@...r.kernel.org, Russell King <linux@....linux.org.uk>
Subject: [RFC PATCH 08/43] ptrace, arm: cleanup arch_ptrace()

use new 'datap' variable type of void pointer in order to remove unnecessary
castings.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Russell King <linux@....linux.org.uk>
---
 arch/arm/kernel/ptrace.c |   33 +++++++++++++++++++--------------
 1 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 87ca2c7..4be8a58 100644
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -851,10 +851,11 @@ long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	int ret;
+	void __user *datap = (void __user *) data;
 
 	switch (request) {
 		case PTRACE_PEEKUSR:
-			ret = ptrace_read_user(child, addr, (unsigned long __user *)data);
+			ret = ptrace_read_user(child, addr, datap);
 			break;
 
 		case PTRACE_POKEUSR:
@@ -862,35 +863,39 @@ long arch_ptrace(struct task_struct *child, long request,
 			break;
 
 		case PTRACE_GETREGS:
-			ret = ptrace_getregs(child, (void __user *)data);
+			ret = ptrace_getregs(child, datap);
 			break;
 
 		case PTRACE_SETREGS:
-			ret = ptrace_setregs(child, (void __user *)data);
+			ret = ptrace_setregs(child, datap);
 			break;
 
 		case PTRACE_GETFPREGS:
-			ret = ptrace_getfpregs(child, (void __user *)data);
+			ret = ptrace_getfpregs(child, datap);
 			break;
 		
 		case PTRACE_SETFPREGS:
-			ret = ptrace_setfpregs(child, (void __user *)data);
+			ret = ptrace_setfpregs(child, datap);
 			break;
 
 #ifdef CONFIG_IWMMXT
 		case PTRACE_GETWMMXREGS:
-			ret = ptrace_getwmmxregs(child, (void __user *)data);
+			ret = ptrace_getwmmxregs(child, datap);
 			break;
 
 		case PTRACE_SETWMMXREGS:
-			ret = ptrace_setwmmxregs(child, (void __user *)data);
+			ret = ptrace_setwmmxregs(child, datap);
 			break;
 #endif
 
-		case PTRACE_GET_THREAD_AREA:
-			ret = put_user(task_thread_info(child)->tp_value,
-				       (unsigned long __user *) data);
+		case PTRACE_GET_THREAD_AREA: {
+			unsigned long tpval;
+			tpval = task_thread_info(child)->tp_value;
+			
+			ret = copy_to_user(datap, &tpval, sizeof(tpval)) ?
+				-EFAULT : 0;
 			break;
+		}
 
 		case PTRACE_SET_SYSCALL:
 			task_thread_info(child)->syscall = data;
@@ -899,21 +904,21 @@ long arch_ptrace(struct task_struct *child, long request,
 
 #ifdef CONFIG_CRUNCH
 		case PTRACE_GETCRUNCHREGS:
-			ret = ptrace_getcrunchregs(child, (void __user *)data);
+			ret = ptrace_getcrunchregs(child, datap);
 			break;
 
 		case PTRACE_SETCRUNCHREGS:
-			ret = ptrace_setcrunchregs(child, (void __user *)data);
+			ret = ptrace_setcrunchregs(child, datap);
 			break;
 #endif
 
 #ifdef CONFIG_VFP
 		case PTRACE_GETVFPREGS:
-			ret = ptrace_getvfpregs(child, (void __user *)data);
+			ret = ptrace_getvfpregs(child, datap);
 			break;
 
 		case PTRACE_SETVFPREGS:
-			ret = ptrace_setvfpregs(child, (void __user *)data);
+			ret = ptrace_setvfpregs(child, datap);
 			break;
 #endif
 
-- 
1.7.2.2

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