[PATCH][cr][nit]: eclone() - Remove extra __user and add a comment

[Sukadev Bhattiprolu]

Sorry, I thought I had sent this minor patch out earlier, but I just
realized I had not.
---

From: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
Date: Mon, 3 May 2010 11:38:16 -0700
Subject: [PATCH 1/1] eclone(): Remove extra __user and add a comment

As pointed out by Russel King, '__user' does not make sense on an integer
type. Remove it. Also add a comment on why we want 'stack_size' to be 0
on x86 and s390.

Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
---
 arch/s390/kernel/process.c |    5 ++++-
 arch/x86/kernel/process.c  |    5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index efc7e8a..b00ffad 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -276,7 +276,7 @@ SYSCALL_DEFINE4(eclone, unsigned int, flags_low, struct clone_args __user *,
 	int __user *parent_tid_ptr;
 	int __user *child_tid_ptr;
 	unsigned long flags;
-	unsigned long __user child_stack;
+	unsigned long child_stack;
 	unsigned long stack_size;
 
 	rc = fetch_clone_args_from_user(uca, args_size, &kca);
@@ -288,6 +288,9 @@ SYSCALL_DEFINE4(eclone, unsigned int, flags_low, struct clone_args __user *,
 	child_tid_ptr =  (int __user *) kca.child_tid_ptr;
 
 	stack_size = (unsigned long) kca.child_stack_size;
+	/*
+	 * s390 does not need/use the stack_size. Ensure it is unused.
+	 */
 	if (stack_size)
 		return -EINVAL;
 
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 5abad20..8b1699a 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -268,7 +268,7 @@ sys_eclone(unsigned flags_low, struct clone_args __user *uca,
 	unsigned long flags;
 	int __user *parent_tidp;
 	int __user *child_tidp;
-	unsigned long __user stack;
+	unsigned long stack;
 	unsigned long stack_size;
 
 	rc = fetch_clone_args_from_user(uca, args_size, &kca);
@@ -286,6 +286,9 @@ sys_eclone(unsigned flags_low, struct clone_args __user *uca,
 	parent_tidp = (int *)(unsigned long)kca.parent_tid_ptr;
 	child_tidp = (int *)(unsigned long)kca.child_tid_ptr;
 
+	/*
+	 * x86 does not need/use the stack_size. Ensure it is unused.
+	 */
 	stack_size = (unsigned long)kca.child_stack_size;
 	if (stack_size)
 		return -EINVAL;