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, 120 deletions

diff --git a/arch/um/kernel/tt/tlb.c b/arch/um/kernel/tt/tlb.c
deleted file mode 100644
index 7caa24fe05d..00000000000
--- a/arch/um/kernel/tt/tlb.c
+++ /dev/null
@@ -1,120 +0,0 @@
-/* 
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
- * Copyright 2003 PathScale, Inc.
- * Licensed under the GPL
- */
-
-#include "linux/stddef.h"
-#include "linux/kernel.h"
-#include "linux/sched.h"
-#include "linux/mm.h"
-#include "asm/page.h"
-#include "asm/pgtable.h"
-#include "asm/uaccess.h"
-#include "asm/tlbflush.h"
-#include "mem_user.h"
-#include "os.h"
-#include "tlb.h"
-
-static int do_ops(union mm_context *mmu, struct host_vm_op *ops, int last,
-		    int finished, void **flush)
-{
-	struct host_vm_op *op;
-        int i, ret=0;
-
-        for(i = 0; i <= last && !ret; i++){
-		op = &ops[i];
-		switch(op->type){
-		case MMAP:
-                        ret = os_map_memory((void *) op->u.mmap.addr,
-                                            op->u.mmap.fd, op->u.mmap.offset,
-                                            op->u.mmap.len, op->u.mmap.r,
-                                            op->u.mmap.w, op->u.mmap.x);
-			break;
-		case MUNMAP:
-                        ret = os_unmap_memory((void *) op->u.munmap.addr,
-                                              op->u.munmap.len);
-			break;
-		case MPROTECT:
-                        ret = protect_memory(op->u.mprotect.addr,
-                                             op->u.munmap.len,
-                                             op->u.mprotect.r,
-                                             op->u.mprotect.w,
-                                             op->u.mprotect.x, 1);
-			protect_memory(op->u.mprotect.addr, op->u.munmap.len,
-				       op->u.mprotect.r, op->u.mprotect.w,
-				       op->u.mprotect.x, 1);
-			break;
-		default:
-			printk("Unknown op type %d in do_ops\n", op->type);
-			break;
-		}
-	}
-
-	return ret;
-}
-
-static void fix_range(struct mm_struct *mm, unsigned long start_addr, 
-		      unsigned long end_addr, int force)
-{
-        if((current->thread.mode.tt.extern_pid != -1) &&
-           (current->thread.mode.tt.extern_pid != os_getpid()))
-                panic("fix_range fixing wrong address space, current = 0x%p",
-                      current);
-
-        fix_range_common(mm, start_addr, end_addr, force, do_ops);
-}
-
-atomic_t vmchange_seq = ATOMIC_INIT(1);
-
-void flush_tlb_kernel_range_tt(unsigned long start, unsigned long end)
-{
-        if(flush_tlb_kernel_range_common(start, end))
-                atomic_inc(&vmchange_seq);
-}
-
-void flush_tlb_kernel_vm_tt(void)
-{
-        flush_tlb_kernel_range(start_vm, end_vm);
-}
-
-void __flush_tlb_one_tt(unsigned long addr)
-{
-        flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
-}
-  
-void flush_tlb_range_tt(struct vm_area_struct *vma, unsigned long start, 
-		     unsigned long end)
-{
-	if(vma->vm_mm != current->mm) return;
-
-	/* Assumes that the range start ... end is entirely within
-	 * either process memory or kernel vm
-	 */
-	if((start >= start_vm) && (start < end_vm)){
-		if(flush_tlb_kernel_range_common(start, end))
-			atomic_inc(&vmchange_seq);
-	}
-	else fix_range(vma->vm_mm, start, end, 0);
-}
-
-void flush_tlb_mm_tt(struct mm_struct *mm)
-{
-	unsigned long seq;
-
-	if(mm != current->mm) return;
-
-	fix_range(mm, 0, STACK_TOP, 0);
-
-	seq = atomic_read(&vmchange_seq);
-	if(current->thread.mode.tt.vm_seq == seq)
-		return;
-	current->thread.mode.tt.vm_seq = seq;
-	flush_tlb_kernel_range_common(start_vm, end_vm);
-}
-
-void force_flush_all_tt(void)
-{
-	fix_range(current->mm, 0, STACK_TOP, 1);
-	flush_tlb_kernel_range_common(start_vm, end_vm);
-}