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get_signal_to_deliver: use the cached ->signal/sighand values 

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@tv-sign.ru>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
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 2008-04-30 00:52:47 -07:00 committed by Linus Torvalds
parent ad16a46069
commit f6b76d4fb0
1 changed files with 15 additions and 15 deletions
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30
kernel/signal.c
View File

@ -1753,8 +1753,9 @@ static int ptrace_signal(int signr, siginfo_t *info,
int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
struct pt_regs *regs, void *cookie)
{
sigset_t *mask = &current->blocked;
int signr = 0;
struct sighand_struct *sighand = current->sighand;
struct signal_struct *signal = current->signal;
int signr;
relock:
/*
@ -1765,13 +1766,13 @@ relock:
*/
try_to_freeze();
spin_lock_irq(&current->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(&current->sighand->siglock);
signal->flags &= ~SIGNAL_CLD_MASK;
spin_unlock_irq(&sighand->siglock);
read_lock(&tasklist_lock);
do_notify_parent_cldstop(current->group_leader, why);
@ -1782,12 +1783,11 @@ 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, &current->blocked, info);
if (!signr)
break; /* will return 0 */
@ -1797,7 +1797,7 @@ relock:
continue;
}
ka = &current->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) {
@ -1834,14 +1834,14 @@ relock:
* We need to check for that and bail out if necessary.
*/
if (signr != SIGSTOP) {
spin_unlock_irq(&current->sighand->siglock);
spin_unlock_irq(&sighand->siglock);
/* signals can be posted during this window */
if (is_current_pgrp_orphaned())
goto relock;
spin_lock_irq(&current->sighand->siglock);
spin_lock_irq(&sighand->siglock);
}
if (likely(do_signal_stop(signr))) {
@ -1856,7 +1856,7 @@ relock:
continue;
}
spin_unlock_irq(&current->sighand->siglock);
spin_unlock_irq(&sighand->siglock);
/*
* Anything else is fatal, maybe with a core dump.
@ -1882,7 +1882,7 @@ relock:
do_group_exit(signr);
/* NOTREACHED */
}
spin_unlock_irq(&current->sighand->siglock);
spin_unlock_irq(&sighand->siglock);
return signr;
}