uml: tidy ptrace interface

Tidy the ptrace interface code.  Removed a bunch of unused macros.
Started converting register sets from arrays of longs to structures.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/arch/um/sys-i386/user-offsets.c b/arch/um/sys-i386/user-offsets.c
index 39bd32b..5f883bf 100644
--- a/arch/um/sys-i386/user-offsets.c
+++ b/arch/um/sys-i386/user-offsets.c
@@ -22,7 +22,7 @@
 	OFFSET(HOST_SC_CR2, sigcontext, cr2);
 
 	DEFINE_LONGS(HOST_FP_SIZE, sizeof(struct user_fpregs_struct));
-	DEFINE_LONGS(HOST_XFP_SIZE, sizeof(struct user_fpxregs_struct));
+	DEFINE_LONGS(HOST_FPX_SIZE, sizeof(struct user_fpxregs_struct));
 
 	DEFINE(HOST_IP, EIP);
 	DEFINE(HOST_SP, UESP);