x86: use generic register name in the thread and tss structures

This changes size-specific register names (eip/rip, esp/rsp, etc.) to
generic names in the thread and tss structures.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 8e1234e..aafc544 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -239,10 +239,10 @@
 	ctxt->gdt_ents      = ARRAY_SIZE(gdt->gdt);
 
 	ctxt->user_regs.cs = __KERNEL_CS;
-	ctxt->user_regs.esp = idle->thread.esp0 - sizeof(struct pt_regs);
+	ctxt->user_regs.esp = idle->thread.sp0 - sizeof(struct pt_regs);
 
 	ctxt->kernel_ss = __KERNEL_DS;
-	ctxt->kernel_sp = idle->thread.esp0;
+	ctxt->kernel_sp = idle->thread.sp0;
 
 	ctxt->event_callback_cs     = __KERNEL_CS;
 	ctxt->event_callback_eip    = (unsigned long)xen_hypervisor_callback;