From mboxrd@z Thu Jan 1 00:00:00 1970 From: b-cousson@ti.com (Benoit Cousson) Date: Fri, 2 Mar 2012 17:50:18 +0100 Subject: [PATCH 06/12] mfd: twl4030-irq: micro-optimization on IRQ handler In-Reply-To: <1330707024-23730-1-git-send-email-b-cousson@ti.com> References: <1330707024-23730-1-git-send-email-b-cousson@ti.com> Message-ID: <1330707024-23730-7-git-send-email-b-cousson@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Felipe Balbi __ffs() will be far faster than the for loop used. Signed-off-by: Felipe Balbi --- drivers/mfd/twl4030-irq.c | 14 +++++++------- 1 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/mfd/twl4030-irq.c b/drivers/mfd/twl4030-irq.c index faf3318..e6dc8f9 100644 --- a/drivers/mfd/twl4030-irq.c +++ b/drivers/mfd/twl4030-irq.c @@ -293,7 +293,6 @@ static unsigned twl4030_irq_base; */ static irqreturn_t handle_twl4030_pih(int irq, void *devid) { - int module_irq; irqreturn_t ret; u8 pih_isr; @@ -304,12 +303,13 @@ static irqreturn_t handle_twl4030_pih(int irq, void *devid) return IRQ_NONE; } - /* these handlers deal with the relevant SIH irq status */ - for (module_irq = twl4030_irq_base; - pih_isr; - pih_isr >>= 1, module_irq++) { - if (pih_isr & 0x1) - handle_nested_irq(module_irq); + while (pih_isr) { + unsigned long pending = __ffs(pih_isr); + unsigned int irq; + + pih_isr &= ~BIT(pending); + irq = pending + twl4030_irq_base; + handle_nested_irq(irq); } return IRQ_HANDLED; -- 1.7.0.4