uml: throw out CONFIG_MODE_TT

This patchset throws out tt mode, which has been non-functional for a while.

This is done in phases, interspersed with code cleanups on the affected files.

The removal is done as follows:
	remove all code, config options, and files which depend on
CONFIG_MODE_TT
	get rid of the CHOOSE_MODE macro, which decided whether to
call tt-mode or skas-mode code, and replace invocations with their
skas portions
	replace all now-trivial procedures with their skas equivalents

There are now a bunch of now-redundant pieces of data structures, including
mode-specific pieces of the thread structure, pt_regs, and mm_context.  These
are all replaced with their skas-specific contents.

As part of the ongoing style compliance project, I made a style pass over all
files that were changed.  There are three such patches, one for each phase,
covering the files affected by that phase but no later ones.

I noticed that we weren't freeing the LDT state associated with a process when
it exited, so that's fixed in one of the later patches.

The last patch is a tidying patch which I've had for a while, but which caused
inexplicable crashes under tt mode.  Since that is no longer a problem, this
can now go in.

This patch:

Start getting rid of tt mode support.

This patch throws out CONFIG_MODE_TT and all config options, code, and files
which depend on it.

CONFIG_MODE_SKAS is gone and everything that depends on it is included
unconditionally.

The few changed lines are in re-written Kconfig help, lines which needed
something skas-related removed from them, and a few more which weren't
strictly deletions.

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>

2 files changed, 1 insertions, 24 deletions

diff --git a/arch/um/include/sysdep-x86_64/ptrace.h b/arch/um/include/sysdep-x86_64/ptrace.h
index 62403bd9966..ff525bda4c1 100644
--- a/arch/um/include/sysdep-x86_64/ptrace.h
+++ b/arch/um/include/sysdep-x86_64/ptrace.h
@@ -1,5 +1,6 @@
 /*
  * Copyright 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  *
  * Licensed under the GPL
  */
@@ -14,11 +15,6 @@
 #define MAX_REG_OFFSET (UM_FRAME_SIZE)
 #define MAX_REG_NR ((MAX_REG_OFFSET) / sizeof(unsigned long))
 
-#ifdef UML_CONFIG_MODE_TT
-#include "sysdep/sc.h"
-#endif
-
-#ifdef UML_CONFIG_MODE_SKAS
 #include "skas_ptregs.h"
 
 #define REGS_IP(r) ((r)[HOST_IP])
@@ -88,21 +84,10 @@
 
 #define REGS_ERR(r) ((r)->fault_type)
 
-#endif
-
 #include "choose-mode.h"
 
 /* XXX */
 union uml_pt_regs {
-#ifdef UML_CONFIG_MODE_TT
-	struct tt_regs {
-		long syscall;
-		unsigned long orig_rax;
-		void *sc;
-                struct faultinfo faultinfo;
-	} tt;
-#endif
-#ifdef UML_CONFIG_MODE_SKAS
 	struct skas_regs {
 		unsigned long regs[MAX_REG_NR];
 		unsigned long fp[HOST_FP_SIZE];
@@ -110,14 +95,10 @@ union uml_pt_regs {
 		long syscall;
 		int is_user;
 	} skas;
-#endif
 };
 
 #define EMPTY_UML_PT_REGS { }
 
-/* XXX */
-extern int mode_tt;
-
 #define UPT_RBX(r) __CHOOSE_MODE(SC_RBX(UPT_SC(r)), REGS_RBX((r)->skas.regs))
 #define UPT_RCX(r) __CHOOSE_MODE(SC_RCX(UPT_SC(r)), REGS_RCX((r)->skas.regs))
 #define UPT_RDX(r) __CHOOSE_MODE(SC_RDX(UPT_SC(r)), REGS_RDX((r)->skas.regs))
diff --git a/arch/um/include/sysdep-x86_64/thread.h b/arch/um/include/sysdep-x86_64/thread.h
index cbef3e1697f..d73d0b0afdb 100644
--- a/arch/um/include/sysdep-x86_64/thread.h
+++ b/arch/um/include/sysdep-x86_64/thread.h
@@ -3,8 +3,4 @@
 
 #include <kern_constants.h>
 
-#ifdef UML_CONFIG_MODE_TT
-#define TASK_EXTERN_PID(task) *((int *) &(((char *) (task))[HOST_TASK_EXTERN_PID]))
-#endif
-
 #endif