Use InterlockedCompareExchange64 instead of InterlockedCompareExchange for 64bit builds.

reactos/ntoskrnl/ps

diff -u -r1.87 -r1.88
--- kill.c	27 Nov 2004 16:47:05 -0000	1.87
+++ kill.c	4 Dec 2004 15:49:20 -0000	1.88
@@ -1,4 +1,4 @@

-/* $Id: kill.c,v 1.87 2004/11/27 16:47:05 hbirr Exp $

+/* $Id: kill.c,v 1.88 2004/12/04 15:49:20 blight Exp $

  *
  * COPYRIGHT:       See COPYING in the top level directory
  * PROJECT:         ReactOS kernel

@@ -142,8 +142,13 @@

    /* If the ProcessoR Control Block's NpxThread points to the current thread
     * unset it.
     */

+#ifdef _WIN64
+   InterlockedCompareExchange64((LONGLONG *)&KeGetCurrentKPCR()->PrcbData.NpxThread,
+                                (LONGLONG)NULL, (LONGLONG)ETHREAD_TO_KTHREAD(CurrentThread));
+#else

    InterlockedCompareExchange((LONG *)&KeGetCurrentKPCR()->PrcbData.NpxThread,
                               (LONG)NULL, (LONG)ETHREAD_TO_KTHREAD(CurrentThread));

+#endif

 
    KeReleaseSpinLock(&PiThreadLock, oldIrql);