Date:	Thu, 28 Sep 2006 14:14:52 -0400
From:	Jeff Dike <jdike@...toit.com>
To:	akpm@...l.org
cc:	linux-kernel@...r.kernel.org,
	user-mode-linux-devel@...ts.sourceforge.net
Subject: [PATCH 1/2] UML - Remove unneeded file

Remove arch/um/kernel/skas/process_kern.c again.  The stack alignment
change which resulted in this file being here is safely in
arch/um/kernel/process.c.

Signed-off-by: Jeff Dike <jdike@...toit.com>
---

 arch/um/kernel/skas/process_kern.c |  483 -------------------------------------
 1 file changed, 483 deletions(-)

Index: linux-2.6.18-mm/arch/um/kernel/skas/process_kern.c
===================================================================
--- linux-2.6.18-mm.orig/arch/um/kernel/skas/process_kern.c	2006-09-28 12:15:48.000000000 -0400
+++ /dev/null	1970-01-01 00:00:00.000000000 +0000
@@ -1,483 +0,0 @@
-/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@...aya.com)
- * Copyright 2003 PathScale, Inc.
- * Licensed under the GPL
- */
-
-#include "linux/kernel.h"
-#include "linux/sched.h"
-#include "linux/interrupt.h"
-#include "linux/string.h"
-#include "linux/mm.h"
-#include "linux/slab.h"
-#include "linux/utsname.h"
-#include "linux/fs.h"
-#include "linux/utime.h"
-#include "linux/smp_lock.h"
-#include "linux/module.h"
-#include "linux/init.h"
-#include "linux/capability.h"
-#include "linux/vmalloc.h"
-#include "linux/spinlock.h"
-#include "linux/proc_fs.h"
-#include "linux/ptrace.h"
-#include "linux/random.h"
-#include "linux/personality.h"
-#include "asm/unistd.h"
-#include "asm/mman.h"
-#include "asm/segment.h"
-#include "asm/stat.h"
-#include "asm/pgtable.h"
-#include "asm/processor.h"
-#include "asm/tlbflush.h"
-#include "asm/uaccess.h"
-#include "asm/user.h"
-#include "user_util.h"
-#include "kern_util.h"
-#include "kern.h"
-#include "signal_kern.h"
-#include "init.h"
-#include "irq_user.h"
-#include "mem_user.h"
-#include "tlb.h"
-#include "frame_kern.h"
-#include "sigcontext.h"
-#include "os.h"
-#include "mode.h"
-#include "mode_kern.h"
-#include "choose-mode.h"
-
-/* This is a per-cpu array.  A processor only modifies its entry and it only
- * cares about its entry, so it's OK if another processor is modifying its
- * entry.
- */
-struct cpu_task cpu_tasks[NR_CPUS] = { [0 ... NR_CPUS - 1] = { -1, NULL } };
-
-int external_pid(void *t)
-{
-	struct task_struct *task = t ? t : current;
-
-	return(CHOOSE_MODE_PROC(external_pid_tt, external_pid_skas, task));
-}
-
-int pid_to_processor_id(int pid)
-{
-	int i;
-
-	for(i = 0; i < ncpus; i++){
-		if(cpu_tasks[i].pid == pid) return(i);
-	}
-	return(-1);
-}
-
-void free_stack(unsigned long stack, int order)
-{
-	free_pages(stack, order);
-}
-
-unsigned long alloc_stack(int order, int atomic)
-{
-	unsigned long page;
-	gfp_t flags = GFP_KERNEL;
-
-	if (atomic)
-		flags = GFP_ATOMIC;
-	page = __get_free_pages(flags, order);
-	if(page == 0)
-		return(0);
-	stack_protections(page);
-	return(page);
-}
-
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-	int pid;
-
-	current->thread.request.u.thread.proc = fn;
-	current->thread.request.u.thread.arg = arg;
-	pid = do_fork(CLONE_VM | CLONE_UNTRACED | flags, 0,
-		      &current->thread.regs, 0, NULL, NULL);
-	if(pid < 0)
-		panic("do_fork failed in kernel_thread, errno = %d", pid);
-	return(pid);
-}
-
-void set_current(void *t)
-{
-	struct task_struct *task = t;
-
-	cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task)
-		{ external_pid(task), task });
-}
-
-void *_switch_to(void *prev, void *next, void *last)
-{
-        struct task_struct *from = prev;
-        struct task_struct *to= next;
-
-        to->thread.prev_sched = from;
-        set_current(to);
-
-	do {
-		current->thread.saved_task = NULL ;
-		CHOOSE_MODE_PROC(switch_to_tt, switch_to_skas, prev, next);
-		if(current->thread.saved_task)
-			show_regs(&(current->thread.regs));
-		next= current->thread.saved_task;
-		prev= current;
-	} while(current->thread.saved_task);
-
-        return(current->thread.prev_sched);
-
-}
-
-void interrupt_end(void)
-{
-	if(need_resched()) schedule();
-	if(test_tsk_thread_flag(current, TIF_SIGPENDING)) do_signal();
-}
-
-void release_thread(struct task_struct *task)
-{
-	CHOOSE_MODE(release_thread_tt(task), release_thread_skas(task));
-}
-
-void exit_thread(void)
-{
-	unprotect_stack((unsigned long) current_thread);
-}
-
-void *get_current(void)
-{
-	return(current);
-}
-
-int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
-		unsigned long stack_top, struct task_struct * p,
-		struct pt_regs *regs)
-{
-	int ret;
-
-	p->thread = (struct thread_struct) INIT_THREAD;
-	ret = CHOOSE_MODE_PROC(copy_thread_tt, copy_thread_skas, nr,
-				clone_flags, sp, stack_top, p, regs);
-
-	if (ret || !current->thread.forking)
-		goto out;
-
-	clear_flushed_tls(p);
-
-	/*
-	 * Set a new TLS for the child thread?
-	 */
-	if (clone_flags & CLONE_SETTLS)
-		ret = arch_copy_tls(p);
-
-out:
-	return ret;
-}
-
-void initial_thread_cb(void (*proc)(void *), void *arg)
-{
-	int save_kmalloc_ok = kmalloc_ok;
-
-	kmalloc_ok = 0;
-	CHOOSE_MODE_PROC(initial_thread_cb_tt, initial_thread_cb_skas, proc,
-			 arg);
-	kmalloc_ok = save_kmalloc_ok;
-}
-
-unsigned long stack_sp(unsigned long page)
-{
-	return(page + PAGE_SIZE - sizeof(void *));
-}
-
-int current_pid(void)
-{
-	return(current->pid);
-}
-
-void default_idle(void)
-{
-	CHOOSE_MODE(uml_idle_timer(), (void) 0);
-
-	while(1){
-		/* endless idle loop with no priority at all */
-
-		/*
-		 * although we are an idle CPU, we do not want to
-		 * get into the scheduler unnecessarily.
-		 */
-		if(need_resched())
-			schedule();
-
-		idle_sleep(10);
-	}
-}
-
-void cpu_idle(void)
-{
-	CHOOSE_MODE(init_idle_tt(), init_idle_skas());
-}
-
-int page_size(void)
-{
-	return(PAGE_SIZE);
-}
-
-void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
-		      pte_t *pte_out)
-{
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte;
-	pte_t ptent;
-
-	if(task->mm == NULL)
-		return(ERR_PTR(-EINVAL));
-	pgd = pgd_offset(task->mm, addr);
-	if(!pgd_present(*pgd))
-		return(ERR_PTR(-EINVAL));
-
-	pud = pud_offset(pgd, addr);
-	if(!pud_present(*pud))
-		return(ERR_PTR(-EINVAL));
-
-	pmd = pmd_offset(pud, addr);
-	if(!pmd_present(*pmd))
-		return(ERR_PTR(-EINVAL));
-
-	pte = pte_offset_kernel(pmd, addr);
-	ptent = *pte;
-	if(!pte_present(ptent))
-		return(ERR_PTR(-EINVAL));
-
-	if(pte_out != NULL)
-		*pte_out = ptent;
-	return((void *) (pte_val(ptent) & PAGE_MASK) + (addr & ~PAGE_MASK));
-}
-
-char *current_cmd(void)
-{
-#if defined(CONFIG_SMP) || defined(CONFIG_HIGHMEM)
-	return("(Unknown)");
-#else
-	void *addr = um_virt_to_phys(current, current->mm->arg_start, NULL);
-	return IS_ERR(addr) ? "(Unknown)": __va((unsigned long) addr);
-#endif
-}
-
-void force_sigbus(void)
-{
-	printk(KERN_ERR "Killing pid %d because of a lack of memory\n",
-	       current->pid);
-	lock_kernel();
-	sigaddset(&current->pending.signal, SIGBUS);
-	recalc_sigpending();
-	current->flags |= PF_SIGNALED;
-	do_exit(SIGBUS | 0x80);
-}
-
-void dump_thread(struct pt_regs *regs, struct user *u)
-{
-}
-
-void enable_hlt(void)
-{
-	panic("enable_hlt");
-}
-
-EXPORT_SYMBOL(enable_hlt);
-
-void disable_hlt(void)
-{
-	panic("disable_hlt");
-}
-
-EXPORT_SYMBOL(disable_hlt);
-
-void *um_kmalloc(int size)
-{
-	return kmalloc(size, GFP_KERNEL);
-}
-
-void *um_kmalloc_atomic(int size)
-{
-	return kmalloc(size, GFP_ATOMIC);
-}
-
-void *um_vmalloc(int size)
-{
-	return vmalloc(size);
-}
-
-void *um_vmalloc_atomic(int size)
-{
-	return __vmalloc(size, GFP_ATOMIC | __GFP_HIGHMEM, PAGE_KERNEL);
-}
-
-int __cant_sleep(void) {
-	return in_atomic() || irqs_disabled() || in_interrupt();
-	/* Is in_interrupt() really needed? */
-}
-
-unsigned long get_fault_addr(void)
-{
-	return((unsigned long) current->thread.fault_addr);
-}
-
-EXPORT_SYMBOL(get_fault_addr);
-
-void not_implemented(void)
-{
-	printk(KERN_DEBUG "Something isn't implemented in here\n");
-}
-
-EXPORT_SYMBOL(not_implemented);
-
-int user_context(unsigned long sp)
-{
-	unsigned long stack;
-
-	stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
-	return(stack != (unsigned long) current_thread);
-}
-
-extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
-
-void do_uml_exitcalls(void)
-{
-	exitcall_t *call;
-
-	call = &__uml_exitcall_end;
-	while (--call >= &__uml_exitcall_begin)
-		(*call)();
-}
-
-char *uml_strdup(char *string)
-{
-	return kstrdup(string, GFP_KERNEL);
-}
-
-int copy_to_user_proc(void __user *to, void *from, int size)
-{
-	return(copy_to_user(to, from, size));
-}
-
-int copy_from_user_proc(void *to, void __user *from, int size)
-{
-	return(copy_from_user(to, from, size));
-}
-
-int clear_user_proc(void __user *buf, int size)
-{
-	return(clear_user(buf, size));
-}
-
-int strlen_user_proc(char __user *str)
-{
-	return(strlen_user(str));
-}
-
-int smp_sigio_handler(void)
-{
-#ifdef CONFIG_SMP
-	int cpu = current_thread->cpu;
-	IPI_handler(cpu);
-	if(cpu != 0)
-		return(1);
-#endif
-	return(0);
-}
-
-int cpu(void)
-{
-	return(current_thread->cpu);
-}
-
-static atomic_t using_sysemu = ATOMIC_INIT(0);
-int sysemu_supported;
-
-void set_using_sysemu(int value)
-{
-	if (value > sysemu_supported)
-		return;
-	atomic_set(&using_sysemu, value);
-}
-
-int get_using_sysemu(void)
-{
-	return atomic_read(&using_sysemu);
-}
-
-static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
-{
-	if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size) /*No overflow*/
-		*eof = 1;
-
-	return strlen(buf);
-}
-
-static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data)
-{
-	char tmp[2];
-
-	if (copy_from_user(tmp, buf, 1))
-		return -EFAULT;
-
-	if (tmp[0] >= '0' && tmp[0] <= '2')
-		set_using_sysemu(tmp[0] - '0');
-	return count; /*We use the first char, but pretend to write everything*/
-}
-
-int __init make_proc_sysemu(void)
-{
-	struct proc_dir_entry *ent;
-	if (!sysemu_supported)
-		return 0;
-
-	ent = create_proc_entry("sysemu", 0600, &proc_root);
-
-	if (ent == NULL)
-	{
-		printk(KERN_WARNING "Failed to register /proc/sysemu\n");
-		return(0);
-	}
-
-	ent->read_proc  = proc_read_sysemu;
-	ent->write_proc = proc_write_sysemu;
-
-	return 0;
-}
-
-late_initcall(make_proc_sysemu);
-
-int singlestepping(void * t)
-{
-	struct task_struct *task = t ? t : current;
-
-	if ( ! (task->ptrace & PT_DTRACE) )
-		return(0);
-
-	if (task->thread.singlestep_syscall)
-		return(1);
-
-	return 2;
-}
-
-/*
- * Only x86 and x86_64 have an arch_align_stack().
- * All other arches have "#define arch_align_stack(x) (x)"
- * in their asm/system.h
- * As this is included in UML from asm-um/system-generic.h,
- * we can use it to behave as the subarch does.
- */
-#ifndef arch_align_stack
-unsigned long arch_align_stack(unsigned long sp)
-{
-	if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
-		sp -= get_random_int() % 8192;
-	return sp & ~0xf;
-}
-#endif

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