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exit_notify: don't take tasklist for TIF_SIGPENDING re-targeting 

->siglock provides enough protection to iterate over the thread group.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Oleg Nesterov 2007-10-16 23:26:58 -07:00 committed by Linus Torvalds
parent 2f4e6e2a81
commit 3ae4cbadf4
1 changed files with 1 additions and 4 deletions
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5
kernel/exit.c
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@ -747,13 +747,11 @@ static void exit_notify(struct task_struct *tsk)
* Now we'll wake all the threads in the group just to make * Now we'll wake all the threads in the group just to make
* sure someone gets all the pending signals. * sure someone gets all the pending signals.
*/ */
read_lock(&tasklist_lock);
spin_lock_irq(&tsk->sighand->siglock); spin_lock_irq(&tsk->sighand->siglock);
for (t = next_thread(tsk); t != tsk; t = next_thread(t)) for (t = next_thread(tsk); t != tsk; t = next_thread(t))
if (!signal_pending(t) && !(t->flags & PF_EXITING)) if (!signal_pending(t) && !(t->flags & PF_EXITING))
recalc_sigpending_and_wake(t); recalc_sigpending_and_wake(t);
spin_unlock_irq(&tsk->sighand->siglock); spin_unlock_irq(&tsk->sighand->siglock);
read_unlock(&tasklist_lock);
} }
write_lock_irq(&tasklist_lock); write_lock_irq(&tasklist_lock);
@ -781,9 +779,8 @@ static void exit_notify(struct task_struct *tsk)
* and we were the only connection outside, so our pgrp * and we were the only connection outside, so our pgrp
* is about to become orphaned. * is about to become orphaned.
*/ */
t = tsk->real_parent; t = tsk->real_parent;
pgrp = task_pgrp(tsk); pgrp = task_pgrp(tsk);
if ((task_pgrp(t) != pgrp) && if ((task_pgrp(t) != pgrp) &&
(task_session(t) == task_session(tsk)) && (task_session(t) == task_session(tsk)) &&