diff options
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 25e429152dd..5bb0bb18434 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -88,6 +88,7 @@ int max_threads; /* tunable limit on nr_threads */ DEFINE_PER_CPU(unsigned long, process_counts) = 0; __cacheline_aligned DEFINE_RWLOCK(tasklist_lock); /* outer */ +EXPORT_SYMBOL(tasklist_lock); #ifdef CONFIG_PROVE_RCU int lockdep_tasklist_lock_is_held(void) @@ -1250,6 +1251,15 @@ static struct task_struct *copy_process(unsigned long clone_flags, /* Need tasklist lock for parent etc handling! */ write_lock_irq(&tasklist_lock); + /* + * The state of the parent's TIF_KTRACE flag may have changed + * since it was copied in dup_task_struct() so we re-copy it here. + */ + if (test_thread_flag(TIF_KERNEL_TRACE)) + set_tsk_thread_flag(p, TIF_KERNEL_TRACE); + else + clear_tsk_thread_flag(p, TIF_KERNEL_TRACE); + /* CLONE_PARENT re-uses the old parent */ if (clone_flags & (CLONE_PARENT|CLONE_THREAD)) { p->real_parent = current->real_parent; |