From: Oleg Nesterov 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 Cc: Roland McGrath Cc: Jiri Kosina Signed-off-by: Andrew Morton --- 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; } _