RT-MIPS-Un-thread-several-interrupts.patch

From cb7a435c2211b301598ded1ae051138b077b6eb9 Mon Sep 17 00:00:00 2001
From: Wu Zhangjin <wuzhangjin@gmail.com>
Date: Wed, 10 Mar 2010 02:27:12 +0800
Subject: [PATCH] RT: MIPS: Un-thread several interrupts

commit cb7a435c2211b301598ded1ae051138b077b6eb9 in tip.

This patch un-thread all of the interrupts whose handler is no_action,
which can return quickly, and also, several other interrupts, such as
bus error interrupt, halt interrupt, for they are urgent to the system,
to un-thread them too.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>

diff --git a/arch/mips/ar7/irq.c b/arch/mips/ar7/irq.c
index c781556..fce30ee 100644
--- a/arch/mips/ar7/irq.c
+++ b/arch/mips/ar7/irq.c
@@ -97,7 +97,8 @@ static struct irq_chip ar7_sec_irq_type = {
 
 static struct irqaction ar7_cascade_action = {
 	.handler = no_action,
-	.name = "AR7 cascade interrupt"
+	.name = "AR7 cascade interrupt",
+	.flags = IRQF_NODELAY,
 };
 
 static void __init ar7_irq_init(int base)
diff --git a/arch/mips/bcm63xx/irq.c b/arch/mips/bcm63xx/irq.c
index a0c5cd1..3e60c93 100644
--- a/arch/mips/bcm63xx/irq.c
+++ b/arch/mips/bcm63xx/irq.c
@@ -234,6 +234,7 @@ static struct irq_chip bcm63xx_external_irq_chip = {
 static struct irqaction cpu_ip2_cascade_action = {
 	.handler	= no_action,
 	.name		= "cascade_ip2",
+	.flags		= IRQF_NODELAY,
 };
 
 void __init arch_init_irq(void)
diff --git a/arch/mips/cobalt/irq.c b/arch/mips/cobalt/irq.c
index cb9bf82..0cbd3b6 100644
--- a/arch/mips/cobalt/irq.c
+++ b/arch/mips/cobalt/irq.c
@@ -48,6 +48,7 @@ asmlinkage void plat_irq_dispatch(void)
 static struct irqaction cascade = {
 	.handler	= no_action,
 	.name		= "cascade",
+	.flags		= IRQF_NODELAY,
 };
 
 void __init arch_init_irq(void)
diff --git a/arch/mips/dec/setup.c b/arch/mips/dec/setup.c
index bd5431e..61b8d9c 100644
--- a/arch/mips/dec/setup.c
+++ b/arch/mips/dec/setup.c
@@ -100,20 +100,24 @@ int cpu_fpu_mask = DEC_CPU_IRQ_MASK(DEC_CPU_INR_FPU);
 static struct irqaction ioirq = {
 	.handler = no_action,
 	.name = "cascade",
+	.flags = IRQF_NODELAY,
 };
 static struct irqaction fpuirq = {
 	.handler = no_action,
 	.name = "fpu",
+	.flags = IRQF_NODELAY,
 };
 
 static struct irqaction busirq = {
 	.flags = IRQF_DISABLED,
 	.name = "bus error",
+	.flags = IRQF_NODELAY,
 };
 
 static struct irqaction haltirq = {
 	.handler = dec_intr_halt,
 	.name = "halt",
+	.flags = IRQF_NODELAY,
 };
 
 
diff --git a/arch/mips/emma/markeins/irq.c b/arch/mips/emma/markeins/irq.c
index 9504b7e..acf3ca9 100644
--- a/arch/mips/emma/markeins/irq.c
+++ b/arch/mips/emma/markeins/irq.c
@@ -182,7 +182,7 @@ void emma2rh_gpio_irq_init(void)
 
 static struct irqaction irq_cascade = {
 	   .handler = no_action,
-	   .flags = 0,
+	   .flags = IRQF_NODELAY,
 	   .name = "cascade",
 	   .dev_id = NULL,
 	   .next = NULL,
diff --git a/arch/mips/lasat/interrupt.c b/arch/mips/lasat/interrupt.c
index 1353fb1..c8a4e0e 100644
--- a/arch/mips/lasat/interrupt.c
+++ b/arch/mips/lasat/interrupt.c
@@ -105,6 +105,7 @@ asmlinkage void plat_irq_dispatch(void)
 static struct irqaction cascade = {
 	.handler	= no_action,
 	.name		= "cascade",
+	.flags		= IRQF_NODELAY,
 };
 
 void __init arch_init_irq(void)
diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
index 4c3fca1..b985560 100644
--- a/arch/mips/mti-malta/malta-int.c
+++ b/arch/mips/mti-malta/malta-int.c
@@ -350,12 +350,14 @@ unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
 
 static struct irqaction i8259irq = {
 	.handler = no_action,
-	.name = "XT-PIC cascade"
+	.name = "XT-PIC cascade",
+	.flags = IRQF_NODELAY,
 };
 
 static struct irqaction corehi_irqaction = {
 	.handler = no_action,
-	.name = "CoreHi"
+	.name = "CoreHi",
+	.flags = IRQF_NODELAY,
 };
 
 static msc_irqmap_t __initdata msc_irqmap[] = {
diff --git a/arch/mips/nxp/pnx8550/common/int.c b/arch/mips/nxp/pnx8550/common/int.c
index 7aca7d5..ca27dcb 100644
--- a/arch/mips/nxp/pnx8550/common/int.c
+++ b/arch/mips/nxp/pnx8550/common/int.c
@@ -166,7 +166,7 @@ static struct irq_chip level_irq_type = {
 
 static struct irqaction gic_action = {
 	.handler =	no_action,
-	.flags =	IRQF_DISABLED,
+	.flags =	IRQF_DISABLED | IRQF_NODELAY,
 	.name =		"GIC",
 };
 
diff --git a/arch/mips/pmc-sierra/msp71xx/msp_irq.c b/arch/mips/pmc-sierra/msp71xx/msp_irq.c
index 734d598..704a60b 100644
--- a/arch/mips/pmc-sierra/msp71xx/msp_irq.c
+++ b/arch/mips/pmc-sierra/msp71xx/msp_irq.c
@@ -97,8 +97,9 @@ asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
 }
 
 static struct irqaction cascade_msp = {
-	.handler = no_action,
-	.name	 = "MSP cascade"
+	.handler= no_action,
+	.name	= "MSP cascade",
+	.flags	= IRQF_NODELAY,
 };
 
 
diff --git a/arch/mips/sgi-ip22/ip22-int.c b/arch/mips/sgi-ip22/ip22-int.c
index 383f11d..18b1a24 100644
--- a/arch/mips/sgi-ip22/ip22-int.c
+++ b/arch/mips/sgi-ip22/ip22-int.c
@@ -163,32 +163,32 @@ static void __irq_entry indy_buserror_irq(void)
 
 static struct irqaction local0_cascade = {
 	.handler	= no_action,
-	.flags		= IRQF_DISABLED,
+	.flags		= IRQF_DISABLED | IRQF_NODELAY,
 	.name		= "local0 cascade",
 };
 
 static struct irqaction local1_cascade = {
 	.handler	= no_action,
-	.flags		= IRQF_DISABLED,
+	.flags		= IRQF_DISABLED | IRQF_NODELAY,
 	.name		= "local1 cascade",
 };
 
 static struct irqaction buserr = {
 	.handler	= no_action,
-	.flags		= IRQF_DISABLED,
+	.flags		= IRQF_DISABLED | IRQF_NODELAY,
 	.name		= "Bus Error",
 };
 
 static struct irqaction map0_cascade = {
 	.handler	= no_action,
-	.flags		= IRQF_DISABLED,
+	.flags		= IRQF_DISABLED | IRQF_NODELAY,
 	.name		= "mapable0 cascade",
 };
 
 #ifdef USE_LIO3_IRQ
 static struct irqaction map1_cascade = {
 	.handler	= no_action,
-	.flags		= IRQF_DISABLED,
+	.flags		= IRQF_DISABLED | IRQF_NODELAY,
 	.name		= "mapable1 cascade",
 };
 #define SGI_INTERRUPTS	SGINT_END
diff --git a/arch/mips/sni/rm200.c b/arch/mips/sni/rm200.c
index 31e2583..8a0bb58 100644
--- a/arch/mips/sni/rm200.c
+++ b/arch/mips/sni/rm200.c
@@ -361,6 +361,7 @@ void sni_rm200_init_8259A(void)
 static struct irqaction sni_rm200_irq2 = {
 	.handler = no_action,
 	.name = "cascade",
+	.flags = IRQF_NODELAY,
 };
 
 static struct resource sni_rm200_pic1_resource = {
diff --git a/arch/mips/vr41xx/common/irq.c b/arch/mips/vr41xx/common/irq.c
index bef0687..e16b1c8 100644
--- a/arch/mips/vr41xx/common/irq.c
+++ b/arch/mips/vr41xx/common/irq.c
@@ -33,6 +33,7 @@ static irq_cascade_t irq_cascade[NR_IRQS] __cacheline_aligned;
 static struct irqaction cascade_irqaction = {
 	.handler	= no_action,
 	.name		= "cascade",
+	.flags		= IRQF_NODELAY,
 };
 
 int cascade_irq(unsigned int irq, int (*get_irq)(unsigned int))
-- 
1.7.1.1