The patch titled get_signal_to_deliver: use the cached ->signal/sighand values has been added to the -mm tree. Its filename is get_signal_to_deliver-use-the-cached-signal-sighand-values.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: get_signal_to_deliver: use the cached ->signal/sighand values From: Oleg Nesterov <oleg@xxxxxxxxxx> Cache the values of current->signal/sighand. Shrinks .text a bit and makes the code more readable. Also, remove "sigset_t *mask", it is pointless because in fact we save the constant offset. 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 | 30 +++++++++++++++--------------- 1 file changed, 15 insertions(+), 15 deletions(-) diff -puN kernel/signal.c~get_signal_to_deliver-use-the-cached-signal-sighand-values kernel/signal.c --- a/kernel/signal.c~get_signal_to_deliver-use-the-cached-signal-sighand-values +++ a/kernel/signal.c @@ -1714,8 +1714,9 @@ static int do_signal_stop(int signr) int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka, struct pt_regs *regs, void *cookie) { - sigset_t *mask = ¤t->blocked; - int signr = 0; + struct sighand_struct *sighand = current->sighand; + struct signal_struct *signal = current->signal; + int signr; relock: /* @@ -1726,13 +1727,13 @@ relock: */ try_to_freeze(); - spin_lock_irq(¤t->sighand->siglock); + spin_lock_irq(&sighand->siglock); - if (unlikely(current->signal->flags & SIGNAL_CLD_MASK)) { - int why = (current->signal->flags & SIGNAL_STOP_CONTINUED) + if (unlikely(signal->flags & SIGNAL_CLD_MASK)) { + int why = (signal->flags & SIGNAL_STOP_CONTINUED) ? CLD_CONTINUED : CLD_STOPPED; - current->signal->flags &= ~SIGNAL_CLD_MASK; - spin_unlock_irq(¤t->sighand->siglock); + signal->flags &= ~SIGNAL_CLD_MASK; + spin_unlock_irq(&sighand->siglock); read_lock(&tasklist_lock); do_notify_parent_cldstop(current->group_leader, why); @@ -1743,12 +1744,11 @@ relock: for (;;) { struct k_sigaction *ka; - if (unlikely(current->signal->group_stop_count > 0) && + if (unlikely(signal->group_stop_count > 0) && do_signal_stop(0)) goto relock; - signr = dequeue_signal(current, mask, info); - + signr = dequeue_signal(current, ¤t->blocked, info); if (!signr) break; /* will return 0 */ @@ -1784,7 +1784,7 @@ relock: } } - ka = ¤t->sighand->action[signr-1]; + ka = &sighand->action[signr-1]; if (ka->sa.sa_handler == SIG_IGN) /* Do nothing. */ continue; if (ka->sa.sa_handler != SIG_DFL) { @@ -1821,14 +1821,14 @@ relock: * We need to check for that and bail out if necessary. */ if (signr != SIGSTOP) { - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&sighand->siglock); /* signals can be posted during this window */ if (is_current_pgrp_orphaned()) goto relock; - spin_lock_irq(¤t->sighand->siglock); + spin_lock_irq(&sighand->siglock); } if (likely(do_signal_stop(signr))) { @@ -1843,7 +1843,7 @@ relock: continue; } - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&sighand->siglock); /* * Anything else is fatal, maybe with a core dump. @@ -1869,7 +1869,7 @@ relock: do_group_exit(signr); /* NOTREACHED */ } - spin_unlock_irq(¤t->sighand->siglock); + spin_unlock_irq(&sighand->siglock); return signr; } _ 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