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[PATCH] cleanup __exit_signal()

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This patch factors out duplicated code under 'if' branches.  Also, BUG_ON()
conversions and whitespace cleanups.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Acked-by: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Oleg Nesterov 2006-03-28 16:11:17 -08:00 committed by Linus Torvalds
parent 6b3934ef52
commit 29ff471234
1 changed files with 15 additions and 16 deletions
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31
kernel/signal.c
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@ -341,24 +341,20 @@ void __exit_sighand(struct task_struct *tsk)
*/
void __exit_signal(struct task_struct *tsk)
{
struct signal_struct * sig = tsk->signal;
struct sighand_struct * sighand;
struct signal_struct *sig = tsk->signal;
struct sighand_struct *sighand;
BUG_ON(!sig);
BUG_ON(!atomic_read(&sig->count));
if (!sig)
BUG();
if (!atomic_read(&sig->count))
BUG();
rcu_read_lock();
sighand = rcu_dereference(tsk->sighand);
spin_lock(&sighand->siglock);
posix_cpu_timers_exit(tsk);
if (atomic_dec_and_test(&sig->count)) {
if (atomic_dec_and_test(&sig->count))
posix_cpu_timers_exit_group(tsk);
tsk->signal = NULL;
__exit_sighand(tsk);
spin_unlock(&sighand->siglock);
flush_sigqueue(&sig->shared_pending);
} else {
else {
/*
* If there is any task waiting for the group exit
* then notify it:
@ -369,7 +365,6 @@ void __exit_signal(struct task_struct *tsk)
}
if (tsk == sig->curr_target)
sig->curr_target = next_thread(tsk);
tsk->signal = NULL;
/*
* Accumulate here the counters for all threads but the
* group leader as they die, so they can be added into
@ -387,14 +382,18 @@ void __exit_signal(struct task_struct *tsk)
sig->nvcsw += tsk->nvcsw;
sig->nivcsw += tsk->nivcsw;
sig->sched_time += tsk->sched_time;
__exit_sighand(tsk);
spin_unlock(&sighand->siglock);
sig = NULL; /* Marker for below. */
sig = NULL; /* Marker for below. */
}
tsk->signal = NULL;
__exit_sighand(tsk);
spin_unlock(&sighand->siglock);
rcu_read_unlock();
clear_tsk_thread_flag(tsk,TIF_SIGPENDING);
flush_sigqueue(&tsk->pending);
if (sig) {
flush_sigqueue(&sig->shared_pending);
__cleanup_signal(sig);
}
}