[PATCH] move_pages: fix 32 -> 64 bit compat function

The definition of the third parameter is a pointer to an array of virtual
addresses which give us some trouble.  The existing code calculated the
wrong address in the array since I used void to avoid having to specify a
type.

I now use the correct type "compat_uptr_t __user *" in the definition of
the function in kernel/compat.c.

However, I used __u32 in syscalls.h.  Would have to include compat.h there
in order to provide the same definition which would generate an ugly
include situation.

On both ia64 and x86_64 compat_uptr_t is u32. So this works although
parameter declarations differ.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/syscalls.h

@@ -522,7 +522,7 @@ asmlinkage long sys_move_pages(pid_t pid, unsigned long nr_pages,
 				int __user *status,
 				int flags);
 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_page,
-				void __user *pages,
+				__u32 __user *pages,
 				const int __user *nodes,
 				int __user *status,
 				int flags);

kernel/compat.c

@@ -938,7 +938,7 @@ asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
 
 #ifdef CONFIG_NUMA
 asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
-		void __user *pages32,
+		compat_uptr_t __user *pages32,
 		const int __user *nodes,
 		int __user *status,
 		int flags)
@@ -950,7 +950,7 @@ asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
 	for (i = 0; i < nr_pages; i++) {
 		compat_uptr_t p;
 
-		if (get_user(p, (compat_uptr_t *)(pages32 + i)) ||
+		if (get_user(p, pages32 + i) ||
 			put_user(compat_ptr(p), pages + i))
 			return -EFAULT;
 	}