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/include/asm-x86/system_64.h b/include/asm-x86/system_64.h
index 6e9e484..3dcb217 100644
--- a/include/asm-x86/system_64.h
+++ b/include/asm-x86/system_64.h
@@ -40,7 +40,7 @@
 		     RESTORE_CONTEXT						    \
 		     : "=a" (last)					  	  \
 		     : [next] "S" (next), [prev] "D" (prev),			  \
-		       [threadrsp] "i" (offsetof(struct task_struct, thread.rsp)), \
+		       [threadrsp] "i" (offsetof(struct task_struct, thread.sp)), \
 		       [ti_flags] "i" (offsetof(struct thread_info, flags)),\
 		       [tif_fork] "i" (TIF_FORK),			  \
 		       [thread_info] "i" (offsetof(struct task_struct, stack)), \