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Diffstat (limited to 'kernel/exit.c')
-rw-r--r--kernel/exit.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/kernel/exit.c b/kernel/exit.c
index d9eab2e4b43..4b4042f9bc6 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -51,6 +51,7 @@
#include <trace/events/sched.h>
#include <linux/hw_breakpoint.h>
#include <linux/oom.h>
+#include <linux/writeback.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@@ -886,7 +887,7 @@ static void check_stack_usage(void)
static inline void check_stack_usage(void) {}
#endif
-NORET_TYPE void do_exit(long code)
+void do_exit(long code)
{
struct task_struct *tsk = current;
int group_dead;
@@ -963,8 +964,7 @@ NORET_TYPE void do_exit(long code)
acct_collect(code, group_dead);
if (group_dead)
tty_audit_exit();
- if (unlikely(tsk->audit_context))
- audit_free(tsk);
+ audit_free(tsk);
tsk->exit_code = code;
taskstats_exit(tsk, group_dead);
@@ -1035,7 +1035,25 @@ NORET_TYPE void do_exit(long code)
validate_creds_for_do_exit(tsk);
preempt_disable();
+ if (tsk->nr_dirtied)
+ __this_cpu_add(dirty_throttle_leaks, tsk->nr_dirtied);
exit_rcu();
+
+ /*
+ * 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 */
@@ -1048,7 +1066,7 @@ NORET_TYPE void do_exit(long code)
EXPORT_SYMBOL_GPL(do_exit);
-NORET_TYPE void complete_and_exit(struct completion *comp, long code)
+void complete_and_exit(struct completion *comp, long code)
{
if (comp)
complete(comp);
@@ -1067,7 +1085,7 @@ SYSCALL_DEFINE1(exit, int, error_code)
* Take down every thread in the group. This is called by fatal signals
* as well as by sys_exit_group (below).
*/
-NORET_TYPE void
+void
do_group_exit(int exit_code)
{
struct signal_struct *sig = current->signal;