[PATCH] s390: task_pt_regs()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 7dd58f8..9f64330 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -217,8 +217,7 @@
             struct pt_regs childregs;
           } *frame;
 
-        frame = ((struct fake_frame *)
-		 (THREAD_SIZE + (unsigned long) p->thread_info)) - 1;
+        frame = container_of(task_pt_regs(p), struct fake_frame, childregs);
         p->thread.ksp = (unsigned long) frame;
 	/* Store access registers to kernel stack of new process. */
         frame->childregs = *regs;