[PATCH] Fix IPC ABI for AMD64

AMD64 like IA64 needs to force IPC_64 in the IPC functions. This makes
2.5 compatible with 2.4 again.

ipc/util.c

@@ -508,7 +508,7 @@ int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid)
 	return 0;
 }
 
-#ifndef __ia64__
+#if !defined(__ia64__) && !defined(__x86_64__)
 
 /**
  *	ipc_parse_version	-	IPC call version

ipc/util.h

@@ -56,7 +56,7 @@ int ipc_checkid(struct ipc_ids* ids, struct kern_ipc_perm* ipcp, int uid);
 void kernel_to_ipc64_perm(struct kern_ipc_perm *in, struct ipc64_perm *out);
 void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out);
 
-#ifdef __ia64__
+#if defined(__ia64__) || defined(__x86_64__)
   /* On IA-64, we always use the "64-bit version" of the IPC structures.  */ 
 # define ipc_parse_version(cmd)	IPC_64
 #else