diff options
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/exit.c | 3 | ||||
| -rw-r--r-- | kernel/fork.c | 23 |
2 files changed, 16 insertions, 10 deletions
diff --git a/kernel/exit.c b/kernel/exit.c index 4a72f17..92af5cd 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -134,8 +134,6 @@ static void __exit_signal(struct task_struct *tsk) * doing sigqueue_free() if we have SIGQUEUE_PREALLOC signals. */ flush_sigqueue(&tsk->pending); - - tsk->signal = NULL; tsk->sighand = NULL; spin_unlock(&sighand->siglock); @@ -150,7 +148,6 @@ static void __exit_signal(struct task_struct *tsk) */ task_rq_unlock_wait(tsk); tty_kref_put(sig->tty); - __cleanup_signal(sig); } } diff --git a/kernel/fork.c b/kernel/fork.c index b7879ef..e08e301 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -165,6 +165,18 @@ void free_task(struct task_struct *tsk) } EXPORT_SYMBOL(free_task); +static inline void free_signal_struct(struct signal_struct *sig) +{ + thread_group_cputime_free(sig); + kmem_cache_free(signal_cachep, sig); +} + +static inline void put_signal_struct(struct signal_struct *sig) +{ + if (atomic_dec_and_test(&sig->sigcnt)) + free_signal_struct(sig); +} + void __put_task_struct(struct task_struct *tsk) { WARN_ON(!tsk->exit_state); @@ -173,6 +185,7 @@ void __put_task_struct(struct task_struct *tsk) exit_creds(tsk); delayacct_tsk_free(tsk); + put_signal_struct(tsk->signal); if (!profile_handoff_task(tsk)) free_task(tsk); @@ -864,6 +877,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) if (!sig) return -ENOMEM; + atomic_set(&sig->sigcnt, 1); atomic_set(&sig->count, 1); atomic_set(&sig->live, 1); init_waitqueue_head(&sig->wait_chldexit); @@ -889,12 +903,6 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) return 0; } -void __cleanup_signal(struct signal_struct *sig) -{ - thread_group_cputime_free(sig); - kmem_cache_free(signal_cachep, sig); -} - static void copy_flags(unsigned long clone_flags, struct task_struct *p) { unsigned long new_flags = p->flags; @@ -1248,6 +1256,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, } if (clone_flags & CLONE_THREAD) { + atomic_inc(¤t->signal->sigcnt); atomic_inc(¤t->signal->count); atomic_inc(¤t->signal->live); p->group_leader = current->group_leader; @@ -1294,7 +1303,7 @@ bad_fork_cleanup_mm: mmput(p->mm); bad_fork_cleanup_signal: if (!(clone_flags & CLONE_THREAD)) - __cleanup_signal(p->signal); + free_signal_struct(p->signal); bad_fork_cleanup_sighand: __cleanup_sighand(p->sighand); bad_fork_cleanup_fs: |