um: Get rid of thread_struct->saved_task
As we have a sane show_stack() now, we can drop
the ->saved_task hack.
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 3df3bd5..29880c9 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -645,11 +645,9 @@
static void stack_proc(void *arg)
{
- struct task_struct *from = current, *to = arg;
+ struct task_struct *task = arg;
- to->thread.saved_task = from;
- rcu_user_hooks_switch(from, to);
- switch_to(from, to, from);
+ show_stack(task, NULL);
}
/*
diff --git a/arch/um/include/asm/processor-generic.h b/arch/um/include/asm/processor-generic.h
index 9046903..d89b02b 100644
--- a/arch/um/include/asm/processor-generic.h
+++ b/arch/um/include/asm/processor-generic.h
@@ -19,7 +19,6 @@
struct mm_struct;
struct thread_struct {
- struct task_struct *saved_task;
struct pt_regs regs;
struct pt_regs *segv_regs;
int singlestep_syscall;
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index bbcef52..eecc414 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -82,19 +82,8 @@
to->thread.prev_sched = from;
set_current(to);
- do {
- current->thread.saved_task = NULL;
-
- switch_threads(&from->thread.switch_buf,
- &to->thread.switch_buf);
-
- arch_switch_to(current);
-
- if (current->thread.saved_task)
- show_regs(&(current->thread.regs));
- to = current->thread.saved_task;
- from = current;
- } while (current->thread.saved_task);
+ switch_threads(&from->thread.switch_buf, &to->thread.switch_buf);
+ arch_switch_to(current);
return current->thread.prev_sched;
}