linux-kernel - [RFC PATCH 27/43] ptrace, mips: cleanup arch

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Date:	Fri, 27 Aug 2010 18:42:13 +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, Ralf Baechle <ralf@...ux-mips.org>
Subject: [RFC PATCH 27/43] ptrace, mips: cleanup arch_ptrace()

use new 'addrp' and 'datap' variables type of void pointer in order to remove
unnecessary castings.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Ralf Baechle <ralf@...ux-mips.org>
---
 arch/mips/kernel/ptrace.c |   23 ++++++++++++-----------
 1 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c
index 26c29dd..c0ab9d2 100644
--- a/arch/mips/kernel/ptrace.c
+++ b/arch/mips/kernel/ptrace.c
@@ -259,6 +259,8 @@ long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	int ret;
+	void __user *addrp = (void __user *) addr;
+	void __user *datap = (void __user *) data;
 
 	switch (request) {
 	/* when I and D space are separate, these will need to be fixed. */
@@ -387,7 +389,9 @@ long arch_ptrace(struct task_struct *child, long request,
 			ret = -EIO;
 			goto out;
 		}
-		ret = put_user(tmp, (unsigned long __user *) data);
+		ret = copy_to_user(datap, &tmp, sizeof(tmp));
+		if (ret)
+			ret = -EFAULT;
 		break;
 	}
 
@@ -479,34 +483,31 @@ long arch_ptrace(struct task_struct *child, long request,
 		}
 
 	case PTRACE_GETREGS:
-		ret = ptrace_getregs(child, (__s64 __user *) data);
+		ret = ptrace_getregs(child, datap);
 		break;
 
 	case PTRACE_SETREGS:
-		ret = ptrace_setregs(child, (__s64 __user *) data);
+		ret = ptrace_setregs(child, datap);
 		break;
 
 	case PTRACE_GETFPREGS:
-		ret = ptrace_getfpregs(child, (__u32 __user *) data);
+		ret = ptrace_getfpregs(child, datap);
 		break;
 
 	case PTRACE_SETFPREGS:
-		ret = ptrace_setfpregs(child, (__u32 __user *) data);
+		ret = ptrace_setfpregs(child, datap);
 		break;
 
 	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;
 
 	case PTRACE_GET_WATCH_REGS:
-		ret = ptrace_get_watch_regs(child,
-					(struct pt_watch_regs __user *) addr);
+		ret = ptrace_get_watch_regs(child, addrp);
 		break;
 
 	case PTRACE_SET_WATCH_REGS:
-		ret = ptrace_set_watch_regs(child,
-					(struct pt_watch_regs __user *) addr);
+		ret = ptrace_set_watch_regs(child, addrp);
 		break;
 
 	default:
-- 
1.7.2.2

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