uml: remove code made redundant by CHOOSE_MODE removal

This patch makes a number of simplifications enabled by the removal of
CHOOSE_MODE.  There were lots of functions that looked like

	int foo(args){
		foo_skas(args);
	}

The bodies of foo_skas are now folded into foo, and their declarations (and
sometimes entire header files) are deleted.

In addition, the union uml_pt_regs, which was a union between the tt and skas
register formats, is now a struct, with the tt-mode arm of the union being
removed.

It turns out that usr2_handler was unused, so it is gone.

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/sys-x86_64/signal.c

@@ -16,12 +16,12 @@
 #include "frame_kern.h"
 #include "skas.h"
 
-void copy_sc(union uml_pt_regs *regs, void *from)
+void copy_sc(struct uml_pt_regs *regs, void *from)
 {
 	struct sigcontext *sc = from;
 
 #define GETREG(regs, regno, sc, regname) \
-       (regs)->skas.regs[(regno) / sizeof(unsigned long)] = (sc)->regname
+       (regs)->regs[(regno) / sizeof(unsigned long)] = (sc)->regname
 
        GETREG(regs, R8, sc, r8);
        GETREG(regs, R9, sc, r9);
@@ -46,13 +46,13 @@ void copy_sc(union uml_pt_regs *regs, void *from)
 #undef GETREG
 }
 
-static int copy_sc_from_user_skas(struct pt_regs *regs,
-                                 struct sigcontext __user *from)
+static int copy_sc_from_user(struct pt_regs *regs,
+			     struct sigcontext __user *from)
 {
        int err = 0;
 
 #define GETREG(regs, regno, sc, regname) \
-       __get_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \
+       __get_user((regs)->regs.regs[(regno) / sizeof(unsigned long)], \
                   &(sc)->regname)
 
        err |= GETREG(regs, R8, from, r8);
@@ -80,10 +80,9 @@ static int copy_sc_from_user_skas(struct pt_regs *regs,
        return err;
 }
 
-int copy_sc_to_user_skas(struct sigcontext __user *to,
-			 struct _fpstate __user *to_fp,
-			 struct pt_regs *regs, unsigned long mask,
-			 unsigned long sp)
+static int copy_sc_to_user(struct sigcontext __user *to,
+			   struct _fpstate __user *to_fp, struct pt_regs *regs,
+			   unsigned long mask, unsigned long sp)
 {
         struct faultinfo * fi = &current->thread.arch.faultinfo;
 	int err = 0;
@@ -92,7 +91,7 @@ int copy_sc_to_user_skas(struct sigcontext __user *to,
 	err |= __put_user(0, &to->fs);
 
 #define PUTREG(regs, regno, sc, regname) \
-       __put_user((regs)->regs.skas.regs[(regno) / sizeof(unsigned long)], \
+       __put_user((regs)->regs.regs[(regno) / sizeof(unsigned long)], \
                   &(sc)->regname)
 
 	err |= PUTREG(regs, RDI, to, rdi);
@@ -130,22 +129,6 @@ int copy_sc_to_user_skas(struct sigcontext __user *to,
 	return(err);
 }
 
-static int copy_sc_from_user(struct pt_regs *to, void __user *from)
-{
-       int ret;
-
-       ret = copy_sc_from_user_skas(to, from);
-       return(ret);
-}
-
-static int copy_sc_to_user(struct sigcontext __user *to,
-			   struct _fpstate __user *fp,
-			   struct pt_regs *from, unsigned long mask,
-			   unsigned long sp)
-{
-       return copy_sc_to_user_skas(to, fp, from, mask, sp);
-}
-
 struct rt_sigframe
 {
        char __user *pretcode;