linux-kernel - [Patch v3 36/36] genirq: Optimize irq_data_to_desc() to avoid irq_to

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Date:	Mon,  1 Jun 2015 16:05:45 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Marc Zyngier <marc.zyngier@....com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Tony Luck <tony.luck@...el.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [Patch v3 36/36] genirq: Optimize irq_data_to_desc() to avoid irq_to_desc() lookup

Optimize irq_data_to_desc() to avoid irq_to_desc() lookup.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 include/linux/irqdesc.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/irqdesc.h b/include/linux/irqdesc.h
index 4dfa46b99a14..749755bffbc1 100644
--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -97,7 +97,7 @@ extern struct irq_desc irq_desc[NR_IRQS];
 static inline struct irq_desc *irq_data_to_desc(struct irq_data *data)
 {
 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
-	return irq_to_desc(data->irq);
+	return container_of(data->common, struct irq_desc, irq_common_data);
 #else
 	return container_of(data, struct irq_desc, irq_data);
 #endif
-- 
1.7.10.4

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