uml: throw out CHOOSE_MODE

The next stage after removing code which depends on CONFIG_MODE_TT is removing
the CHOOSE_MODE abstraction, which provided both compile-time and run-time
branching to either tt-mode or skas-mode code.

This patch removes choose-mode.h and all inclusions of it, and replaces all
CHOOSE_MODE invocations with the skas branch.  This leaves a number of trivial
functions which will be dealt with in a later patch.

There are some changes in the uaccess and tls support which go somewhat beyond
this and eliminate some of the now-redundant functions.

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-i386/ldt.c

@@ -12,7 +12,6 @@
 #include "asm/smp.h"
 #include "asm/ldt.h"
 #include "asm/unistd.h"
-#include "choose-mode.h"
 #include "kern.h"
 #include "mode_kern.h"
 #include "os.h"
@@ -506,6 +505,5 @@ void free_ldt(struct mmu_context_skas * mm)
 
 int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
 {
-	return CHOOSE_MODE_PROC(do_modify_ldt_tt, do_modify_ldt_skas, func,
-	                        ptr, bytecount);
+	return do_modify_ldt_skas(func, ptr, bytecount);
 }

arch/um/sys-i386/ptrace.c

@@ -230,13 +230,13 @@ static inline unsigned long twd_fxsr_to_i387( struct i387_fxsave_struct *fxsave
 static inline int convert_fxsr_to_user(struct _fpstate __user *buf,
 				       struct pt_regs *regs)
 {
-	return(CHOOSE_MODE(convert_fxsr_to_user_tt(buf, regs), 0));
+	return 0;
 }
 
 static inline int convert_fxsr_from_user(struct pt_regs *regs, 
 					 struct _fpstate __user *buf)
 {
-	return(CHOOSE_MODE(convert_fxsr_from_user_tt(regs, buf), 0));
+	return 0;
 }
 
 int get_fpregs(unsigned long buf, struct task_struct *child)
@@ -261,12 +261,12 @@ int set_fpregs(unsigned long buf, struct task_struct *child)
 
 int get_fpxregs(unsigned long buf, struct task_struct *tsk)
 {
-	return(CHOOSE_MODE(get_fpxregs_tt(buf, tsk), 0));
+	return 0;
 }
 
 int set_fpxregs(unsigned long buf, struct task_struct *tsk)
 {
-	return(CHOOSE_MODE(set_fpxregs_tt(buf, tsk), 0));
+	return 0;
 }
 
 #ifdef notdef
@@ -286,16 +286,9 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 }
 #endif
 
-static inline void copy_fpu_fxsave(struct pt_regs *regs,
-				   struct user_i387_struct *buf)
-{
-	(void) CHOOSE_MODE(copy_fpu_fxsave_tt(regs, buf), 0);
-}
-
 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
 {
-	copy_fpu_fxsave(regs, (struct user_i387_struct *) fpu);
-	return(1);
+	return 1;
 }
 
 /*

arch/um/sys-i386/signal.c

@@ -12,7 +12,6 @@
 #include "frame_kern.h"
 #include "sigcontext.h"
 #include "registers.h"
-#include "mode.h"
 #include "skas.h"
 
 void copy_sc(union uml_pt_regs *regs, void *from)
@@ -108,20 +107,13 @@ int copy_sc_to_user_skas(struct sigcontext __user *to, struct _fpstate __user *t
 
 static int copy_sc_from_user(struct pt_regs *to, void __user *from)
 {
-	int ret;
-
-	ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
-					       sizeof(struct _fpstate)),
-			  copy_sc_from_user_skas(to, from));
-	return ret;
+	return copy_sc_from_user_skas(to, from);
 }
 
 static int copy_sc_to_user(struct sigcontext __user *to, struct _fpstate __user *fp,
 			   struct pt_regs *from, unsigned long sp)
 {
-	return CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
-					      sizeof(*fp), sp),
-                           copy_sc_to_user_skas(to, fp, from, sp));
+	return copy_sc_to_user_skas(to, fp, from, sp);
 }
 
 static int copy_ucontext_to_user(struct ucontext __user *uc, struct _fpstate __user *fp,

arch/um/sys-i386/tls.c

@@ -12,7 +12,6 @@
 #include "asm/segment.h"
 #include "asm/smp.h"
 #include "asm/desc.h"
-#include "choose-mode.h"
 #include "kern.h"
 #include "kern_util.h"
 #include "mode_kern.h"
@@ -28,7 +27,7 @@
 static int host_supports_tls = -1;
 int host_gdt_entry_tls_min;
 
-int do_set_thread_area_skas(struct user_desc *info)
+int do_set_thread_area(struct user_desc *info)
 {
 	int ret;
 	u32 cpu;
@@ -39,7 +38,7 @@ int do_set_thread_area_skas(struct user_desc *info)
 	return ret;
 }
 
-int do_get_thread_area_skas(struct user_desc *info)
+int do_get_thread_area(struct user_desc *info)
 {
 	int ret;
 	u32 cpu;
@@ -277,7 +276,7 @@ asmlinkage int sys_set_thread_area(struct user_desc __user *user_desc)
 			return -EFAULT;
 	}
 
-	ret = CHOOSE_MODE_PROC(do_set_thread_area_tt, do_set_thread_area_skas, &info);
+	ret = do_set_thread_area(&info);
 	if (ret)
 		return ret;
 	return set_tls_entry(current, &info, idx, 1);