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Commit 4a599942 authored by Oleg Nesterov's avatar Oleg Nesterov Committed by Linus Torvalds
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exit: avoid sig->count in __exit_signal() to detect the group-dead case 



Change __exit_signal() to check thread_group_leader() instead of
atomic_dec_and_test(&sig->count).  This must be equivalent, the group
leader must be released only after all other threads have exited and
passed __exit_signal().

Henceforth sig->count is not actually used, except in fs/proc for
get_nr_threads/etc.

Signed-off-by: default avatarOleg Nesterov <oleg@redhat.com>
Acked-by: default avatarRoland McGrath <roland@redhat.com>
Cc: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent d344193a

kernel/exit.c

+3 −2
Original line number Diff line number Diff line
@@ -88,11 +88,12 @@ static void __exit_signal(struct task_struct *tsk) 
					rcu_read_lock_held() ||

					lockdep_tasklist_lock_is_held());

	spin_lock(&sighand->siglock);

	atomic_dec(&sig->count);



	posix_cpu_timers_exit(tsk);

	if (atomic_dec_and_test(&sig->count))

	if (thread_group_leader(tsk)) {

		posix_cpu_timers_exit_group(tsk);

	else {

	} else {

		/*

		 * If there is any task waiting for the group exit

		 * then notify it: