[PATCH v5 25/27] irq_domain: remove "hint" when allocating irq numbers

Grant Likely
2012-02-16T09:11:42Z

The 'hint' used to try and line up irq numbers with hw irq numbers is
rather a hack and not very useful. Now that /proc/interrupts also outputs
the hwirq number, it is even less useful to keep around the 'hint' heuristic.

This patch removes it.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Milton Miller <miltonm@bga.com>
Tested-by: Olof Johansson <olof@lixom.net>
---
kernel/irq/irqdomain.c | 20 ++++----------------
1 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 2d3dfff..db7adb2 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -350,7 +350,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain)
unsigned int irq_create_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
- unsigned int virq, hint;
+ unsigned int virq;

pr_debug("irq: irq_create_mapping(0x%p, 0x%lx)\n", domain, hwirq);

@@ -377,12 +377,7 @@ unsigned int irq_create_mapping(struct irq_domain *domain,
return irq_domain_legacy_revmap(domain, hwirq);

/* Allocate a virtual interrupt number */
- hint = hwirq % irq_virq_count;
- if (hint == 0)
- hint++;
- virq = irq_alloc_desc_from(hint, 0);
- if (!virq)
- virq = irq_alloc_desc_from(1, 0);
+ virq = irq_alloc_desc_from(1, 0);
if (!virq) {
pr_debug("irq: -> virq allocation failed\n");
return 0;
@@ -503,7 +498,6 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
{
unsigned int i;
- unsigned int hint = hwirq % irq_virq_count;

/* Look for default domain if nececssary */
if (domain == NULL)
@@ -516,17 +510,11 @@ unsigned int irq_find_mapping(struct irq_domain *domain,
return irq_domain_legacy_revmap(domain, hwirq);

/* Slow path does a linear search of the map */
- if (hint == 0)
- hint = 1;
- i = hint;
- do {
+ for (i = 0; i < irq_virq_count; i++) {
struct irq_data *data = irq_get_irq_data(i);
if (data && (data->domain == domain) && (data->hwirq == hwirq))
return i;
- i++;
- if (i >= irq_virq_count)
- i = 1
- } while(i != hint);
+ }
return 0;
}
EXPORT_SYMBOL_GPL(irq_find_mapping);
--
1.7.9