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>

1 files changed, 0 insertions, 105 deletions

diff --git a/arch/um/kernel/tt/uaccess_user.c b/arch/um/kernel/tt/uaccess_user.c
deleted file mode 100644
index 0e5c82c5e5b7..000000000000
--- a/arch/um/kernel/tt/uaccess_user.c
+++ /dev/null
@@ -1,105 +0,0 @@
-/* 
- * Copyright (C) 2001 Chris Emerson (cemerson@chiark.greenend.org.uk)
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <string.h>
-#include "uml_uaccess.h"
-#include "task.h"
-#include "kern_util.h"
-#include "os.h"
-#include "longjmp.h"
-
-int __do_copy_from_user(void *to, const void *from, int n,
-                        void **fault_addr, void **fault_catcher)
-{
-        struct tt_regs save = TASK_REGS(get_current())->tt;
-        unsigned long fault;
-        int faulted;
-
-        fault = __do_user_copy(to, from, n, fault_addr, fault_catcher,
-                               __do_copy, &faulted);
-        TASK_REGS(get_current())->tt = save;
-
-        if(!faulted)
-                return 0;
-        else if (fault)
-                return n - (fault - (unsigned long) from);
-        else
-                /* In case of a general protection fault, we don't have the
-                 * fault address, so NULL is used instead. Pretend we didn't
-                 * copy anything. */
-                return n;
-}
-
-static void __do_strncpy(void *dst, const void *src, int count)
-{
-        strncpy(dst, src, count);
-}       
-
-int __do_strncpy_from_user(char *dst, const char *src, unsigned long count,
-                           void **fault_addr, void **fault_catcher)
-{
-        struct tt_regs save = TASK_REGS(get_current())->tt;
-        unsigned long fault;
-        int faulted;
-
-        fault = __do_user_copy(dst, src, count, fault_addr, fault_catcher,
-                               __do_strncpy, &faulted);
-        TASK_REGS(get_current())->tt = save;
-
-        if(!faulted) return(strlen(dst));
-        else return(-1);
-}
-
-static void __do_clear(void *to, const void *from, int n)
-{
-        memset(to, 0, n);
-}       
-
-int __do_clear_user(void *mem, unsigned long len,
-                    void **fault_addr, void **fault_catcher)
-{
-        struct tt_regs save = TASK_REGS(get_current())->tt;
-        unsigned long fault;
-        int faulted;
-
-        fault = __do_user_copy(mem, NULL, len, fault_addr, fault_catcher,
-                               __do_clear, &faulted);
-        TASK_REGS(get_current())->tt = save;
-
-        if(!faulted) return(0);
-        else return(len - (fault - (unsigned long) mem));
-}
-
-int __do_strnlen_user(const char *str, unsigned long n,
-                      void **fault_addr, void **fault_catcher)
-{
-        struct tt_regs save = TASK_REGS(get_current())->tt;
-        int ret;
-        unsigned long *faddrp = (unsigned long *)fault_addr;
-        jmp_buf jbuf;
-
-        *fault_catcher = &jbuf;
-        if(UML_SETJMP(&jbuf) == 0)
-                ret = strlen(str) + 1;
-        else ret = *faddrp - (unsigned long) str;
-
-        *fault_addr = NULL;
-        *fault_catcher = NULL;
-
-        TASK_REGS(get_current())->tt = save;
-        return ret;
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */