The patch titled handle_stop_signal: use the cached p->signal value has been added to the -mm tree. Its filename is handle_stop_signal-use-the-cached-p-signal-value.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: handle_stop_signal: use the cached p->signal value From: Oleg Nesterov <oleg@xxxxxxxxxx> Cache the value of p->signal, and change the code to use while_each_thread() helper. 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 | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) diff -puN kernel/signal.c~handle_stop_signal-use-the-cached-p-signal-value kernel/signal.c --- a/kernel/signal.c~handle_stop_signal-use-the-cached-p-signal-value +++ a/kernel/signal.c @@ -566,9 +566,10 @@ static void do_notify_parent_cldstop(str */ static void handle_stop_signal(int sig, struct task_struct *p) { + struct signal_struct *signal = p->signal; struct task_struct *t; - if (p->signal->flags & SIGNAL_GROUP_EXIT) + if (signal->flags & SIGNAL_GROUP_EXIT) /* * The process is in the middle of dying already. */ @@ -578,19 +579,18 @@ static void handle_stop_signal(int sig, /* * This is a stop signal. Remove SIGCONT from all queues. */ - rm_from_queue(sigmask(SIGCONT), &p->signal->shared_pending); + rm_from_queue(sigmask(SIGCONT), &signal->shared_pending); t = p; do { rm_from_queue(sigmask(SIGCONT), &t->pending); - t = next_thread(t); - } while (t != p); + } while_each_thread(p, t); } else if (sig == SIGCONT) { unsigned int why; /* * Remove all stop signals from all queues, * and wake all threads. */ - rm_from_queue(SIG_KERNEL_STOP_MASK, &p->signal->shared_pending); + rm_from_queue(SIG_KERNEL_STOP_MASK, &signal->shared_pending); t = p; do { unsigned int state; @@ -615,9 +615,7 @@ static void handle_stop_signal(int sig, state |= TASK_INTERRUPTIBLE; } wake_up_state(t, state); - - t = next_thread(t); - } while (t != p); + } while_each_thread(p, t); /* * Notify the parent with CLD_CONTINUED if we were stopped. @@ -628,29 +626,29 @@ static void handle_stop_signal(int sig, * CLD_CONTINUED was dropped. */ why = 0; - if (p->signal->flags & SIGNAL_STOP_STOPPED) + if (signal->flags & SIGNAL_STOP_STOPPED) why |= SIGNAL_CLD_CONTINUED; - else if (p->signal->group_stop_count) + else if (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; + signal->flags = why | SIGNAL_STOP_CONTINUED; + signal->group_stop_count = 0; + signal->group_exit_code = 0; } else { /* * We are not stopped, but there could be a stop * signal in the middle of being processed after * being removed from the queue. Clear that too. */ - p->signal->flags &= ~SIGNAL_STOP_DEQUEUED; + signal->flags &= ~SIGNAL_STOP_DEQUEUED; } } else if (sig == SIGKILL) { /* * Make sure that any pending stop signal already dequeued * is undone by the wakeup for SIGKILL. */ - p->signal->flags &= ~SIGNAL_STOP_DEQUEUED; + signal->flags &= ~SIGNAL_STOP_DEQUEUED; } } _ Patches currently in -mm which might be from oleg@xxxxxxxxxx are git-hrt.patch kthread-call-wake_up_process-without-the-lock-being-held.patch mmap_region-cleanup-the-final-vma_merge-related-code.patch remove-unused-variable-from-send_signal.patch turn-legacy_queue-macro-into-static-inline-function.patch consolidate-checking-for-ignored-legacy-signals.patch consolidate-checking-for-ignored-legacy-signals-simplify.patch signals-do_signal_stop-use-signal_group_exit.patch signals-do_group_exit-use-signal_group_exit-more-consistently.patch lock_task_sighand-add-rcu-lock-unlock.patch k_getrusage-dont-take-rcu_read_lock.patch do_task_stat-dont-take-rcu_read_lock.patch signals-consolidate-checks-for-whether-or-not-to-ignore-a-signal.patch signals-clean-dequeue_signal-from-excess-checks-and-assignments.patch signals-consolidate-send_sigqueue-and-send_group_sigqueue.patch signals-cleanup-security_task_kill-usage-implementation.patch signals-re-assign-cld_continued-notification-from-the-sender-to-reciever.patch kill_pid_info-dont-take-now-unneeded-tasklist_lock.patch handle_stop_signal-unify-partial-full-stop-handling.patch handle_stop_signal-use-the-cached-p-signal-value.patch get_signal_to_deliver-use-the-cached-signal-sighand-values.patch ptrace-introduce-task_detached-helper.patch ptrace-introduce-ptrace_reparented-helper.patch reparent_thread-use-same_thread_group.patch document-de_thread-with-exit_notify-connection.patch workqueues-shrink-cpu_populated_map-when-cpu-dies.patch workqueues-shrink-cpu_populated_map-when-cpu-dies-fix.patch cleanup_workqueue_thread-remove-the-unneeded-cpu-parameter.patch simplify-cpu_hotplug_begin-put_online_cpus.patch redo-locking-of-tty-pgrp.patch resume-tty-on-susp-and-fix-crnl-order-in-n_tty-line-discipline.patch tty_io-fix-remaining-pid-struct-locking.patch tty_io-fix-remaining-pid-struct-locking-small-cleanup.patch procfs-task-exe-symlink.patch procfs-task-exe-symlink-fix.patch procfs-task-exe-symlink-fix-2.patch free_pidmap-turn-it-into-free_pidmapstruct-upid.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