nmi_backtrace: do a local dump_stack() instead of a self-NMI

[cascardo/linux.git] / kernel / exit.c

diff --git a/kernel/exit.c b/kernel/exit.c
index 091a78b..9d68c45 100644 (file)
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -511,7 +511,7 @@ static void exit_mm(struct task_struct *tsk)
        mm_update_next_owner(mm);
        mmput(mm);
        if (test_thread_flag(TIF_MEMDIE))
-               exit_oom_victim(tsk);
+               exit_oom_victim();
 }
 
 static struct task_struct *find_alive_thread(struct task_struct *p)
@@ -725,7 +725,7 @@ static void check_stack_usage(void)
 static inline void check_stack_usage(void) {}
 #endif
 
-void do_exit(long code)
+void __noreturn do_exit(long code)
 {
        struct task_struct *tsk = current;
        int group_dead;
@@ -882,29 +882,7 @@ void do_exit(long code)
        exit_rcu();
        TASKS_RCU(__srcu_read_unlock(&tasks_rcu_exit_srcu, tasks_rcu_i));
 
-       /*
-        * The setting of TASK_RUNNING by try_to_wake_up() may be delayed
-        * when the following two conditions become true.
-        *   - There is race condition of mmap_sem (It is acquired by
-        *     exit_mm()), and
-        *   - SMI occurs before setting TASK_RUNINNG.
-        *     (or hypervisor of virtual machine switches to other guest)
-        *  As a result, we may become TASK_RUNNING after becoming TASK_DEAD
-        *
-        * To avoid it, we have to wait for releasing tsk->pi_lock which
-        * is held by try_to_wake_up()
-        */
-       smp_mb();
-       raw_spin_unlock_wait(&tsk->pi_lock);
-
-       /* causes final put_task_struct in finish_task_switch(). */
-       tsk->state = TASK_DEAD;
-       tsk->flags |= PF_NOFREEZE;      /* tell freezer to ignore us */
-       schedule();
-       BUG();
-       /* Avoid "noreturn function does return".  */
-       for (;;)
-               cpu_relax();    /* For when BUG is null */
+       do_task_dead();
 }
 EXPORT_SYMBOL_GPL(do_exit);