1 files changed, 46 insertions, 103 deletions

diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index d2134802f6a8..63b38a3f73f7 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -43,7 +43,10 @@
  * 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] = { NULL } };
+struct task_struct *cpu_tasks[NR_CPUS] = {
+	[0 ... NR_CPUS - 1] = &init_task,
+};
+EXPORT_SYMBOL(cpu_tasks);
 
 void free_stack(unsigned long stack, int order)
 {
@@ -64,7 +67,7 @@ unsigned long alloc_stack(int order, int atomic)
 
 static inline void set_current(struct task_struct *task)
 {
-	cpu_tasks[task_thread_info(task)->cpu] = ((struct cpu_task) { task });
+	cpu_tasks[task_thread_info(task)->cpu] = task;
 }
 
 struct task_struct *__switch_to(struct task_struct *from, struct task_struct *to)
@@ -81,14 +84,18 @@ struct task_struct *__switch_to(struct task_struct *from, struct task_struct *to
 void interrupt_end(void)
 {
 	struct pt_regs *regs = &current->thread.regs;
-
-	if (need_resched())
-		schedule();
-	if (test_thread_flag(TIF_SIGPENDING) ||
-	    test_thread_flag(TIF_NOTIFY_SIGNAL))
-		do_signal(regs);
-	if (test_thread_flag(TIF_NOTIFY_RESUME))
-		resume_user_mode_work(regs);
+	unsigned long thread_flags;
+
+	thread_flags = read_thread_flags();
+	while (thread_flags & _TIF_WORK_MASK) {
+		if (thread_flags & _TIF_NEED_RESCHED)
+			schedule();
+		if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
+			do_signal(regs);
+		if (thread_flags & _TIF_NOTIFY_RESUME)
+			resume_user_mode_work(regs);
+		thread_flags = read_thread_flags();
+	}
 }
 
 int get_current_pid(void)
@@ -109,21 +116,19 @@ void new_thread_handler(void)
 		schedule_tail(current->thread.prev_sched);
 	current->thread.prev_sched = NULL;
 
-	fn = current->thread.request.u.thread.proc;
-	arg = current->thread.request.u.thread.arg;
+	fn = current->thread.request.thread.proc;
+	arg = current->thread.request.thread.arg;
 
 	/*
 	 * callback returns only if the kernel thread execs a process
 	 */
 	fn(arg);
-	userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
+	userspace(&current->thread.regs.regs);
 }
 
 /* Called magically, see new_thread_handler above */
 static void fork_handler(void)
 {
-	force_flush_all();
-
 	schedule_tail(current->thread.prev_sched);
 
 	/*
@@ -135,12 +140,12 @@ static void fork_handler(void)
 
 	current->thread.prev_sched = NULL;
 
-	userspace(&current->thread.regs.regs, current_thread_info()->aux_fp_regs);
+	userspace(&current->thread.regs.regs);
 }
 
 int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
 {
-	unsigned long clone_flags = args->flags;
+	u64 clone_flags = args->flags;
 	unsigned long sp = args->stack;
 	unsigned long tls = args->tls;
 	void (*handler)(void);
@@ -160,8 +165,8 @@ int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
 		arch_copy_thread(&current->thread.arch, &p->thread.arch);
 	} else {
 		get_safe_registers(p->thread.regs.regs.gp, p->thread.regs.regs.fp);
-		p->thread.request.u.thread.proc = args->fn;
-		p->thread.request.u.thread.arg = args->fn_arg;
+		p->thread.request.thread.proc = args->fn;
+		p->thread.request.thread.arg = args->fn_arg;
 		handler = new_thread_handler;
 	}
 
@@ -182,11 +187,22 @@ int copy_thread(struct task_struct * p, const struct kernel_clone_args *args)
 
 void initial_thread_cb(void (*proc)(void *), void *arg)
 {
-	int save_kmalloc_ok = kmalloc_ok;
-
-	kmalloc_ok = 0;
 	initial_thread_cb_skas(proc, arg);
-	kmalloc_ok = save_kmalloc_ok;
+}
+
+int arch_dup_task_struct(struct task_struct *dst,
+			 struct task_struct *src)
+{
+	/* init_task is not dynamically sized (missing FPU state) */
+	if (unlikely(src == &init_task)) {
+		memcpy(dst, src, sizeof(init_task));
+		memset((void *)dst + sizeof(init_task), 0,
+		       arch_task_struct_size - sizeof(init_task));
+	} else {
+		memcpy(dst, src, arch_task_struct_size);
+	}
+
+	return 0;
 }
 
 void um_idle_sleep(void)
@@ -202,17 +218,19 @@ void arch_cpu_idle(void)
 	um_idle_sleep();
 }
 
+void arch_cpu_idle_prepare(void)
+{
+	os_idle_prepare();
+}
+
 int __uml_cant_sleep(void) {
 	return in_atomic() || irqs_disabled() || in_interrupt();
 	/* Is in_interrupt() really needed? */
 }
 
-int user_context(unsigned long sp)
+int uml_need_resched(void)
 {
-	unsigned long stack;
-
-	stack = sp & (PAGE_MASK << CONFIG_KERNEL_STACK_ORDER);
-	return stack != (unsigned long) current_thread_info();
+	return need_resched();
 }
 
 extern exitcall_t __uml_exitcall_begin, __uml_exitcall_end;
@@ -237,73 +255,6 @@ int copy_from_user_proc(void *to, void __user *from, int size)
 	return copy_from_user(to, from, size);
 }
 
-static atomic_t using_sysemu = ATOMIC_INIT(0);
-int sysemu_supported;
-
-static void set_using_sysemu(int value)
-{
-	if (value > sysemu_supported)
-		return;
-	atomic_set(&using_sysemu, value);
-}
-
-static int get_using_sysemu(void)
-{
-	return atomic_read(&using_sysemu);
-}
-
-static int sysemu_proc_show(struct seq_file *m, void *v)
-{
-	seq_printf(m, "%d\n", get_using_sysemu());
-	return 0;
-}
-
-static int sysemu_proc_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, sysemu_proc_show, NULL);
-}
-
-static ssize_t sysemu_proc_write(struct file *file, const char __user *buf,
-				 size_t count, loff_t *pos)
-{
-	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');
-	/* We use the first char, but pretend to write everything */
-	return count;
-}
-
-static const struct proc_ops sysemu_proc_ops = {
-	.proc_open	= sysemu_proc_open,
-	.proc_read	= seq_read,
-	.proc_lseek	= seq_lseek,
-	.proc_release	= single_release,
-	.proc_write	= sysemu_proc_write,
-};
-
-static int __init make_proc_sysemu(void)
-{
-	struct proc_dir_entry *ent;
-	if (!sysemu_supported)
-		return 0;
-
-	ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_ops);
-
-	if (ent == NULL)
-	{
-		printk(KERN_WARNING "Failed to register /proc/sysemu\n");
-		return 0;
-	}
-
-	return 0;
-}
-
-late_initcall(make_proc_sysemu);
-
 int singlestepping(void)
 {
 	return test_thread_flag(TIF_SINGLESTEP);
@@ -356,11 +307,3 @@ unsigned long __get_wchan(struct task_struct *p)
 
 	return 0;
 }
-
-int elf_core_copy_task_fpregs(struct task_struct *t, elf_fpregset_t *fpu)
-{
-	int cpu = current_thread_info()->cpu;
-
-	return save_i387_registers(userspace_pid[cpu], (unsigned long *) fpu);
-}
-