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Commit f95e085b authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Benjamin Herrenschmidt
Browse files

powerpc: Convert big_irq_lock to raw_spinlock 



big_irq_lock needs to be a real spinlock in RT. Convert it to
raw_spinlock.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 087d8c7d

arch/powerpc/kernel/irq.c

+11 −11
Original line number Diff line number Diff line
@@ -520,7 +520,7 @@ void do_softirq(void) 
 */



static LIST_HEAD(irq_hosts);

static DEFINE_SPINLOCK(irq_big_lock);

static DEFINE_RAW_SPINLOCK(irq_big_lock);

static unsigned int revmap_trees_allocated;

static DEFINE_MUTEX(revmap_trees_mutex);

struct irq_map_entry irq_map[NR_IRQS];
@@ -566,14 +566,14 @@ struct irq_host *irq_alloc_host(struct device_node *of_node, 
	if (host->ops->match == NULL)

		host->ops->match = default_irq_host_match;



	spin_lock_irqsave(&irq_big_lock, flags);

	raw_spin_lock_irqsave(&irq_big_lock, flags);



	/* If it's a legacy controller, check for duplicates and

	 * mark it as allocated (we use irq 0 host pointer for that

	 */

	if (revmap_type == IRQ_HOST_MAP_LEGACY) {

		if (irq_map[0].host != NULL) {

			spin_unlock_irqrestore(&irq_big_lock, flags);

			raw_spin_unlock_irqrestore(&irq_big_lock, flags);

			/* If we are early boot, we can't free the structure,

			 * too bad...

			 * this will be fixed once slab is made available early
@@ -587,7 +587,7 @@ struct irq_host *irq_alloc_host(struct device_node *of_node, 
	}



	list_add(&host->link, &irq_hosts);

	spin_unlock_irqrestore(&irq_big_lock, flags);

	raw_spin_unlock_irqrestore(&irq_big_lock, flags);



	/* Additional setups per revmap type */

	switch(revmap_type) {
@@ -638,13 +638,13 @@ struct irq_host *irq_find_host(struct device_node *node) 
	 * the absence of a device node. This isn't a problem so far

	 * yet though...

	 */

	spin_lock_irqsave(&irq_big_lock, flags);

	raw_spin_lock_irqsave(&irq_big_lock, flags);

	list_for_each_entry(h, &irq_hosts, link)

		if (h->ops->match(h, node)) {

			found = h;

			break;

		}

	spin_unlock_irqrestore(&irq_big_lock, flags);

	raw_spin_unlock_irqrestore(&irq_big_lock, flags);

	return found;

}

EXPORT_SYMBOL_GPL(irq_find_host);
@@ -1013,7 +1013,7 @@ unsigned int irq_alloc_virt(struct irq_host *host, 
	if (count == 0 || count > (irq_virq_count - NUM_ISA_INTERRUPTS))

		return NO_IRQ;



	spin_lock_irqsave(&irq_big_lock, flags);

	raw_spin_lock_irqsave(&irq_big_lock, flags);



	/* Use hint for 1 interrupt if any */

	if (count == 1 && hint >= NUM_ISA_INTERRUPTS &&
@@ -1037,7 +1037,7 @@ unsigned int irq_alloc_virt(struct irq_host *host, 
		}

	}

	if (found == NO_IRQ) {

		spin_unlock_irqrestore(&irq_big_lock, flags);

		raw_spin_unlock_irqrestore(&irq_big_lock, flags);

		return NO_IRQ;

	}

 hint_found:
@@ -1046,7 +1046,7 @@ unsigned int irq_alloc_virt(struct irq_host *host, 
		smp_wmb();

		irq_map[i].host = host;

	}

	spin_unlock_irqrestore(&irq_big_lock, flags);

	raw_spin_unlock_irqrestore(&irq_big_lock, flags);

	return found;

}
@@ -1058,7 +1058,7 @@ void irq_free_virt(unsigned int virq, unsigned int count) 
	WARN_ON (virq < NUM_ISA_INTERRUPTS);

	WARN_ON (count == 0 || (virq + count) > irq_virq_count);



	spin_lock_irqsave(&irq_big_lock, flags);

	raw_spin_lock_irqsave(&irq_big_lock, flags);

	for (i = virq; i < (virq + count); i++) {

		struct irq_host *host;
@@ -1071,7 +1071,7 @@ void irq_free_virt(unsigned int virq, unsigned int count) 
		smp_wmb();

		irq_map[i].host = NULL;

	}

	spin_unlock_irqrestore(&irq_big_lock, flags);

	raw_spin_unlock_irqrestore(&irq_big_lock, flags);

}



int arch_early_irq_init(void)