linux-kernel - [PATCH 4/7] gpio: dwapb: use irq_linear

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Message-Id: <1395505004-22650-5-git-send-email-bigeasy@linutronix.de>
Date:	Sat, 22 Mar 2014 17:16:41 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	atull@...era.com
Cc:	linus.walleij@...aro.org, gnurou@...il.com,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	dinguyen@...era.com, delicious.quinoa@...il.com,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [PATCH 4/7] gpio: dwapb: use irq_linear_revmap() for the faster lookup

According to irq_linear_revmap() comment, it is slightly faster compared
to irq_find_mapping() since we don't use a radix tree but a linear
mapping.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
---
 drivers/gpio/gpio-dwapb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index 4d25a06b..541b893 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -92,7 +92,7 @@ static void dwapb_irq_handler(u32 irq, struct irq_desc *desc)
 
 	while (irq_status) {
 		int hwirq = fls(irq_status) - 1;
-		int gpio_irq = irq_find_mapping(gpio->domain, hwirq);
+		int gpio_irq = irq_linear_revmap(gpio->domain, hwirq);
 
 		generic_handle_irq(gpio_irq);
 		irq_status &= ~BIT(hwirq);
-- 
1.9.1

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