The patch titled handle_stop_signal: unify partial/full stop handling has been removed from the -mm tree. Its filename was handle_stop_signal-unify-partial-full-stop-handling.patch This patch was dropped because it was merged into mainline or a subsystem tree The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: handle_stop_signal: unify partial/full stop handling From: Oleg Nesterov <oleg@xxxxxxxxxx> Now that handle_stop_signal() doesn't drop ->siglock, we can't see both ->group_stop_count && SIGNAL_STOP_STOPPED. Merge two "if" branches. As Roland pointed out, we never actually needed 2 do_notify_parent_cldstop() calls. Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx> Cc: Roland McGrath <roland@xxxxxxxxxx> Cc: Jiri Kosina <jkosina@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- kernel/signal.c | 45 +++++++++++++++++++-------------------------- 1 file changed, 19 insertions(+), 26 deletions(-) diff -puN kernel/signal.c~handle_stop_signal-unify-partial-full-stop-handling kernel/signal.c --- a/kernel/signal.c~handle_stop_signal-unify-partial-full-stop-handling +++ a/kernel/signal.c @@ -585,33 +585,16 @@ static void handle_stop_signal(int sig, t = next_thread(t); } while (t != p); } else if (sig == SIGCONT) { + unsigned int why; /* * Remove all stop signals from all queues, * and wake all threads. */ - if (unlikely(p->signal->group_stop_count > 0)) { - /* - * There was a group stop in progress. We'll - * pretend it finished before we got here. We are - * obliged to report it to the parent: if the - * SIGSTOP happened "after" this SIGCONT, then it - * would have cleared this pending SIGCONT. If it - * happened "before" this SIGCONT, then the parent - * got the SIGCHLD about the stop finishing before - * the continue happened. We do the notification - * now, and it's as if the stop had finished and - * the SIGCHLD was pending on entry to this kill. - */ - p->signal->group_stop_count = 0; - p->signal->flags = SIGNAL_STOP_CONTINUED | - SIGNAL_CLD_STOPPED; - } rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending); t = p; do { unsigned int state; rm_from_queue(SIG_KERNEL_STOP_MASK, &t->pending); - /* * If there is a handler for SIGCONT, we must make * sure that no thread returns to user mode before @@ -621,7 +604,7 @@ static void handle_stop_signal(int sig, * running the handler. With the TIF_SIGPENDING * flag set, the thread will pause and acquire the * siglock that we hold now and until we've queued - * the pending signal. + * the pending signal. * * Wake up the stopped thread _after_ setting * TIF_SIGPENDING @@ -636,13 +619,23 @@ static void handle_stop_signal(int sig, t = next_thread(t); } while (t != p); - if (p->signal->flags & SIGNAL_STOP_STOPPED) { - /* - * We were in fact stopped, and are now continued. - * Notify the parent with CLD_CONTINUED. - */ - p->signal->flags = SIGNAL_STOP_CONTINUED | - SIGNAL_CLD_CONTINUED; + /* + * Notify the parent with CLD_CONTINUED if we were stopped. + * + * If we were in the middle of a group stop, we pretend it + * was already finished, and then continued. Since SIGCHLD + * doesn't queue we report only CLD_STOPPED, as if the next + * CLD_CONTINUED was dropped. + */ + why = 0; + if (p->signal->flags & SIGNAL_STOP_STOPPED) + why |= SIGNAL_CLD_CONTINUED; + else if (p->signal->group_stop_count) + why |= SIGNAL_CLD_STOPPED; + + if (why) { + p->signal->flags = why | SIGNAL_STOP_CONTINUED; + p->signal->group_stop_count = 0; p->signal->group_exit_code = 0; } else { /* _ Patches currently in -mm which might be from oleg@xxxxxxxxxx are origin.patch posix-timers-bug-10460-discard-the-pending-signal-when-the-timer-is-destroyed.patch workqueue-remove-redundant-function-invocation.patch put_pid-make-sure-we-dont-free-the-live-pid.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html