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authorGrant Likely <grant.likely@linaro.org>2013-06-10 12:19:17 +0100
committerGrant Likely <grant.likely@linaro.org>2013-06-24 14:02:41 +0100
commitd3dcb436f61593843af178d4a520c8c43c04d3fc (patch)
tree1c2f64841936402a5d01ed923abd427f311a0e7a /kernel/irq
parent56a3d5ac774d054ece9373277a861338a468a294 (diff)
downloadblackbird-op-linux-d3dcb436f61593843af178d4a520c8c43c04d3fc.tar.gz
blackbird-op-linux-d3dcb436f61593843af178d4a520c8c43c04d3fc.zip
irqdomain: make irq_linear_revmap() a fast path again
Over the years, irq_linear_revmap() gained tests and checks to make sure callers were using it safely, which while important, also make it less of a fast path. After the irqdomain refactoring done recently, it is now possible to make irq_linear_revmap() a fast path again. This patch moves irq_linear_revmap() to the header file and makes it a static inline so that interrupt controller drivers using a linear mapping can decode the virq from a hwirq in just a couple of instructions. Signed-off-by: Grant Likely <grant.likely@linaro.org>
Diffstat (limited to 'kernel/irq')
-rw-r--r--kernel/irq/irqdomain.c34
1 files changed, 8 insertions, 26 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index e47b35671384..836a0f7ec2a9 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -559,35 +559,17 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
return hwirq;
}
- return irq_linear_revmap(domain, hwirq);
+ /* Check if the hwirq is in the linear revmap. */
+ if (hwirq < domain->revmap_size)
+ return domain->linear_revmap[hwirq];
+
+ rcu_read_lock();
+ data = radix_tree_lookup(&domain->revmap_tree, hwirq);
+ rcu_read_unlock();
+ return data ? data->irq : 0;
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
-/**
- * irq_linear_revmap() - Find a linux irq from a hw irq number.
- * @domain: domain owning this hardware interrupt
- * @hwirq: hardware irq number in that domain space
- *
- * This is a fast path that can be called directly by irq controller code to
- * save a handful of instructions.
- */
-unsigned int irq_linear_revmap(struct irq_domain *domain,
- irq_hw_number_t hwirq)
-{
- struct irq_data *data;
-
- /* Check revmap bounds; complain if exceeded */
- if (hwirq >= domain->revmap_size) {
- rcu_read_lock();
- data = radix_tree_lookup(&domain->revmap_tree, hwirq);
- rcu_read_unlock();
- return data ? data->irq : 0;
- }
-
- return domain->linear_revmap[hwirq];
-}
-EXPORT_SYMBOL_GPL(irq_linear_revmap);
-
#ifdef CONFIG_IRQ_DOMAIN_DEBUG
static int virq_debug_show(struct seq_file *m, void *private)
{
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