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Subject[PATCH 2/3] handle_stop_signal: use the cached p->signal value
Cache the value of p->signal, and change the code to use while_each_thread()
helper.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>

--- 25/kernel/signal.c~3_HSS_CACHE_SIGNAL 2008-03-03 17:08:31.000000000 +0300
+++ 25/kernel/signal.c 2008-03-04 21:10:22.000000000 +0300
@@ -559,9 +559,10 @@ 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.
*/
@@ -571,19 +572,18 @@ 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;
@@ -608,9 +608,7 @@ 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.
@@ -621,29 +619,29 @@ 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;
}
}



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