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, 84 deletions

diff --git a/arch/um/kernel/tt/exec_kern.c b/arch/um/kernel/tt/exec_kern.c
deleted file mode 100644
index 40126cb51801..000000000000
--- a/arch/um/kernel/tt/exec_kern.c
+++ /dev/null
@@ -1,84 +0,0 @@
-/* 
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include "linux/kernel.h"
-#include "linux/mm.h"
-#include "asm/signal.h"
-#include "asm/ptrace.h"
-#include "asm/uaccess.h"
-#include "asm/pgalloc.h"
-#include "asm/tlbflush.h"
-#include "kern_util.h"
-#include "irq_user.h"
-#include "mem_user.h"
-#include "os.h"
-#include "tlb.h"
-#include "mode.h"
-
-static int exec_tramp(void *sig_stack)
-{
-	init_new_thread_stack(sig_stack, NULL);
-	init_new_thread_signals();
-	os_stop_process(os_getpid());
-	return(0);
-}
-
-void flush_thread_tt(void)
-{
-	unsigned long stack;
-	int new_pid;
-
-	stack = alloc_stack(0, 0);
-	if(stack == 0){
-		printk(KERN_ERR 
-		       "flush_thread : failed to allocate temporary stack\n");
-		do_exit(SIGKILL);
-	}
-		
-	new_pid = start_fork_tramp(task_stack_page(current), stack, 0, exec_tramp);
-	if(new_pid < 0){
-		printk(KERN_ERR 
-		       "flush_thread : new thread failed, errno = %d\n",
-		       -new_pid);
-		do_exit(SIGKILL);
-	}
-
-	if(current_thread->cpu == 0)
-		forward_interrupts(new_pid);
-	current->thread.request.op = OP_EXEC;
-	current->thread.request.u.exec.pid = new_pid;
-	unprotect_stack((unsigned long) current_thread);
-	os_usr1_process(os_getpid());
-	change_sig(SIGUSR1, 1);
-
-	change_sig(SIGUSR1, 0);
-	enable_timer();
-	free_page(stack);
-	protect_memory(uml_reserved, high_physmem - uml_reserved, 1, 1, 0, 1);
-	stack_protections((unsigned long) current_thread);
-	force_flush_all();
-	unblock_signals();
-}
-
-void start_thread_tt(struct pt_regs *regs, unsigned long eip, 
-		     unsigned long esp)
-{
-	set_fs(USER_DS);
-	flush_tlb_mm(current->mm);
-	PT_REGS_IP(regs) = eip;
-	PT_REGS_SP(regs) = esp;
-	PT_FIX_EXEC_STACK(esp);
-}
-
-/*
- * 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:
- */