vserver 1.9.3

[linux-2.6.git] / arch / ia64 / kernel / irq.c

diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
index 42056fb..f779d97 100644 (file)
--- a/arch/ia64/kernel/irq.c
+++ b/arch/ia64/kernel/irq.c
@@ -84,10 +84,13 @@ irq_desc_t _irq_desc[NR_IRQS] __cacheline_aligned = {
        }
 };
 
+#ifdef CONFIG_SMP
 /*
  * This is updated when the user sets irq affinity via /proc
  */
-cpumask_t    __cacheline_aligned pending_irq_cpumask[NR_IRQS];
+cpumask_t __cacheline_aligned pending_irq_cpumask[NR_IRQS];
+static unsigned long pending_irq_redir[BITS_TO_LONGS(NR_IRQS)];
+#endif
 
 #ifdef CONFIG_IA64_GENERIC
 irq_desc_t * __ia64_irq_desc (unsigned int irq)
@@ -254,14 +257,16 @@ int handle_IRQ_event(unsigned int irq,
                struct pt_regs *regs, struct irqaction *action)
 {
        int status = 1; /* Force the "do bottom halves" bit */
-       int retval = 0;
+       int ret, retval = 0;
 
        if (!(action->flags & SA_INTERRUPT))
                local_irq_enable();
 
        do {
-               status |= action->flags;
-               retval |= action->handler(irq, action->dev_id, regs);
+               ret = action->handler(irq, action->dev_id, regs);
+               if (ret == IRQ_HANDLED)
+                       status |= action->flags;
+               retval |= ret;
                action = action->next;
        } while (action);
        if (status & SA_SAMPLE_RANDOM)
@@ -607,7 +612,7 @@ int request_irq(unsigned int irq,
 
        action->handler = handler;
        action->flags = irqflags;
-       action->mask = 0;
+       cpus_clear(action->mask);
        action->name = devname;
        action->next = NULL;
        action->dev_id = dev_id;
@@ -961,7 +966,7 @@ static int irq_affinity_read_proc (char *page, char **start, off_t off,
        return len;
 }
 
-static int irq_affinity_write_proc (struct file *file, const char *buffer,
+static int irq_affinity_write_proc (struct file *file, const char __user *buffer,
                                    unsigned long count, void *data)
 {
        unsigned int irq = (unsigned long) data;
@@ -973,6 +978,7 @@ static int irq_affinity_write_proc (struct file *file, const char *buffer,
        int prelen;
        irq_desc_t *desc = irq_descp(irq);
        unsigned long flags;
+       int redir = 0;
 
        if (!desc->handler->set_affinity)
                return -EIO;
@@ -995,7 +1001,7 @@ static int irq_affinity_write_proc (struct file *file, const char *buffer,
        prelen = 0;
        if (tolower(*rbuf) == 'r') {
                prelen = strspn(rbuf, "Rr ");
-               irq |= IA64_IRQ_REDIRECTED;
+               redir++;
        }
 
        err = cpumask_parse(buffer+prelen, count-prelen, new_value);
@@ -1013,11 +1019,33 @@ static int irq_affinity_write_proc (struct file *file, const char *buffer,
 
        spin_lock_irqsave(&desc->lock, flags);
        pending_irq_cpumask[irq] = new_value;
+       if (redir)
+               set_bit(irq, pending_irq_redir);
+       else
+               clear_bit(irq, pending_irq_redir);
        spin_unlock_irqrestore(&desc->lock, flags);
 
        return full_count;
 }
 
+void move_irq(int irq)
+{
+       /* note - we hold desc->lock */
+       cpumask_t tmp;
+       irq_desc_t *desc = irq_descp(irq);
+       int redir = test_bit(irq, pending_irq_redir);
+
+       if (!cpus_empty(pending_irq_cpumask[irq])) {
+               cpus_and(tmp, pending_irq_cpumask[irq], cpu_online_map);
+               if (unlikely(!cpus_empty(tmp))) {
+                       desc->handler->set_affinity(irq | (redir ? IA64_IRQ_REDIRECTED : 0),
+                                                   pending_irq_cpumask[irq]);
+               }
+               cpus_clear(pending_irq_cpumask[irq]);
+       }
+}
+
+
 #endif /* CONFIG_SMP */
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -1113,31 +1141,6 @@ void fixup_irqs(void)
 }
 #endif
 
-static int prof_cpu_mask_read_proc (char *page, char **start, off_t off,
-                       int count, int *eof, void *data)
-{
-       int len = cpumask_scnprintf(page, count, *(cpumask_t *)data);
-       if (count - len < 2)
-               return -EINVAL;
-       len += sprintf(page + len, "\n");
-       return len;
-}
-
-static int prof_cpu_mask_write_proc (struct file *file, const char *buffer,
-                                       unsigned long count, void *data)
-{
-       cpumask_t *mask = (cpumask_t *)data;
-       unsigned long full_count = count, err;
-       cpumask_t new_value;
-
-       err = cpumask_parse(buffer, count, new_value);
-       if (err)
-               return err;
-
-       *mask = new_value;
-       return full_count;
-}
-
 #define MAX_NAMELEN 10
 
 static void register_irq_proc (unsigned int irq)
@@ -1172,26 +1175,15 @@ static void register_irq_proc (unsigned int irq)
 #endif
 }
 
-cpumask_t prof_cpu_mask = CPU_MASK_ALL;
-
 void init_irq_proc (void)
 {
-       struct proc_dir_entry *entry;
        int i;
 
        /* create /proc/irq */
-       root_irq_dir = proc_mkdir("irq", 0);
+       root_irq_dir = proc_mkdir("irq", NULL);
 
        /* create /proc/irq/prof_cpu_mask */
-       entry = create_proc_entry("prof_cpu_mask", 0600, root_irq_dir);
-
-       if (!entry)
-               return;
-
-       entry->nlink = 1;
-       entry->data = (void *)&prof_cpu_mask;
-       entry->read_proc = prof_cpu_mask_read_proc;
-       entry->write_proc = prof_cpu_mask_write_proc;
+       create_prof_cpu_mask(root_irq_dir);
 
        /*
         * Create entries for all existing IRQs.