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Date: Sun, 13 Jun 2010 17:31:27 +0200
From: Tejun Heo <tj@...nel.org>
To: mingo@...e.hu, tglx@...utronix.de, bphilips@...e.de,
yinghai@...nel.org, akpm@...ux-foundation.org,
torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
jeff@...zik.org, linux-ide@...r.kernel.org,
stern@...land.harvard.edu, gregkh@...e.de, khali@...ux-fr.org
Cc: Tejun Heo <tj@...nel.org>
Subject: [PATCH 01/12] irq: cleanup irqfixup
Make the following cleanups to irqfixup.
* Define IRQFIXUP_{SPURIOUS|MISROUTED|POLL} and use them instead of
hard coding 0, 1 and 2.
* Add an inline note_interrupt() wrapper which checks noirqdebug and
calls __note_interrupt() instead of checking noirqdebug from each
caller.
Signed-off-by: Tejun Heo <tj@...nel.org>
---
arch/arm/mach-ns9xxx/irq.c | 3 ---
arch/powerpc/platforms/cell/interrupt.c | 5 +----
include/linux/irq.h | 13 +++++++++++--
kernel/irq/chip.c | 18 ++++++------------
kernel/irq/handle.c | 6 ++----
kernel/irq/internals.h | 2 --
kernel/irq/spurious.c | 30 ++++++++++++++++++------------
7 files changed, 38 insertions(+), 39 deletions(-)
diff --git a/arch/arm/mach-ns9xxx/irq.c b/arch/arm/mach-ns9xxx/irq.c
index 038f24d..6be86e9 100644
--- a/arch/arm/mach-ns9xxx/irq.c
+++ b/arch/arm/mach-ns9xxx/irq.c
@@ -82,9 +82,6 @@ static void handle_prio_irq(unsigned int irq, struct irq_desc *desc)
action_ret = handle_IRQ_event(irq, action);
- /* XXX: There is no direct way to access noirqdebug, so check
- * unconditionally for spurious irqs...
- * Maybe this function should go to kernel/irq/chip.c? */
note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
diff --git a/arch/powerpc/platforms/cell/interrupt.c b/arch/powerpc/platforms/cell/interrupt.c
index 10eb1a4..e638fb3 100644
--- a/arch/powerpc/platforms/cell/interrupt.c
+++ b/arch/powerpc/platforms/cell/interrupt.c
@@ -233,8 +233,6 @@ static int iic_host_match(struct irq_host *h, struct device_node *node)
"IBM,CBEA-Internal-Interrupt-Controller");
}
-extern int noirqdebug;
-
static void handle_iic_irq(unsigned int irq, struct irq_desc *desc)
{
raw_spin_lock(&desc->lock);
@@ -267,8 +265,7 @@ static void handle_iic_irq(unsigned int irq, struct irq_desc *desc)
desc->status &= ~IRQ_PENDING;
raw_spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
} while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING);
diff --git a/include/linux/irq.h b/include/linux/irq.h
index c03243a..ec93be4 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -324,8 +324,17 @@ static inline void generic_handle_irq(unsigned int irq)
}
/* Handling of unhandled and spurious interrupts: */
-extern void note_interrupt(unsigned int irq, struct irq_desc *desc,
- irqreturn_t action_ret);
+extern void __note_interrupt(unsigned int irq, struct irq_desc *desc,
+ irqreturn_t action_ret);
+
+static inline void note_interrupt(unsigned int irq, struct irq_desc *desc,
+ irqreturn_t action_ret)
+{
+ extern int noirqdebug;
+
+ if (!noirqdebug)
+ __note_interrupt(irq, desc, action_ret);
+}
/* Resending of interrupts :*/
void check_irq_resend(struct irq_desc *desc, unsigned int irq);
diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index b7091d5..db26ff0 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -406,8 +406,7 @@ void handle_nested_irq(unsigned int irq)
raw_spin_unlock_irq(&desc->lock);
action_ret = action->thread_fn(action->irq, action->dev_id);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock_irq(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
@@ -450,8 +449,7 @@ handle_simple_irq(unsigned int irq, struct irq_desc *desc)
raw_spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
@@ -495,8 +493,7 @@ handle_level_irq(unsigned int irq, struct irq_desc *desc)
raw_spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
@@ -548,8 +545,7 @@ handle_fasteoi_irq(unsigned int irq, struct irq_desc *desc)
raw_spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
desc->status &= ~IRQ_INPROGRESS;
@@ -625,8 +621,7 @@ handle_edge_irq(unsigned int irq, struct irq_desc *desc)
desc->status &= ~IRQ_PENDING;
raw_spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
} while ((desc->status & (IRQ_PENDING | IRQ_DISABLED)) == IRQ_PENDING);
@@ -654,8 +649,7 @@ handle_percpu_irq(unsigned int irq, struct irq_desc *desc)
desc->chip->ack(irq);
action_ret = handle_IRQ_event(irq, desc->action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
if (desc->chip->eoi)
desc->chip->eoi(irq);
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 27e5c69..3ae50bf 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -461,8 +461,7 @@ unsigned int __do_IRQ(unsigned int irq)
desc->chip->ack(irq);
if (likely(!(desc->status & IRQ_DISABLED))) {
action_ret = handle_IRQ_event(irq, desc->action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
}
desc->chip->end(irq);
return 1;
@@ -515,8 +514,7 @@ unsigned int __do_IRQ(unsigned int irq)
raw_spin_unlock(&desc->lock);
action_ret = handle_IRQ_event(irq, action);
- if (!noirqdebug)
- note_interrupt(irq, desc, action_ret);
+ note_interrupt(irq, desc, action_ret);
raw_spin_lock(&desc->lock);
if (likely(!(desc->status & IRQ_PENDING)))
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index c63f3bc..341f952 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -2,8 +2,6 @@
* IRQ subsystem internal functions and variables:
*/
-extern int noirqdebug;
-
/* Set default functions for irq_chip structures: */
extern void irq_chip_set_defaults(struct irq_chip *chip);
diff --git a/kernel/irq/spurious.c b/kernel/irq/spurious.c
index 89fb90a..5da60a2 100644
--- a/kernel/irq/spurious.c
+++ b/kernel/irq/spurious.c
@@ -14,7 +14,15 @@
#include <linux/moduleparam.h>
#include <linux/timer.h>
-static int irqfixup __read_mostly;
+enum {
+ /* irqfixup levels */
+ IRQFIXUP_SPURIOUS = 0, /* spurious storm detection */
+ IRQFIXUP_MISROUTED = 1, /* misrouted IRQ fixup */
+ IRQFIXUP_POLL = 2, /* enable polling by default */
+};
+
+int noirqdebug __read_mostly;
+static int irqfixup __read_mostly = IRQFIXUP_SPURIOUS;
#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
static void poll_spurious_irqs(unsigned long dummy);
@@ -184,7 +192,7 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
{
struct irqaction *action;
- if (!irqfixup)
+ if (irqfixup < IRQFIXUP_MISROUTED)
return 0;
/* We didn't actually handle the IRQ - see if it was misrouted? */
@@ -192,11 +200,11 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
return 1;
/*
- * But for 'irqfixup == 2' we also do it for handled interrupts if
- * they are marked as IRQF_IRQPOLL (or for irq zero, which is the
- * traditional PC timer interrupt.. Legacy)
+ * But for IRQFIXUP_POLL we also do it for handled interrupts
+ * if they are marked as IRQF_IRQPOLL (or for irq zero, which
+ * is the traditional PC timer interrupt.. Legacy)
*/
- if (irqfixup < 2)
+ if (irqfixup < IRQFIXUP_POLL)
return 0;
if (!irq)
@@ -213,8 +221,8 @@ try_misrouted_irq(unsigned int irq, struct irq_desc *desc,
return action && (action->flags & IRQF_IRQPOLL);
}
-void note_interrupt(unsigned int irq, struct irq_desc *desc,
- irqreturn_t action_ret)
+void __note_interrupt(unsigned int irq, struct irq_desc *desc,
+ irqreturn_t action_ret)
{
if (unlikely(action_ret != IRQ_HANDLED)) {
/*
@@ -262,8 +270,6 @@ void note_interrupt(unsigned int irq, struct irq_desc *desc,
desc->irqs_unhandled = 0;
}
-int noirqdebug __read_mostly;
-
int noirqdebug_setup(char *str)
{
noirqdebug = 1;
@@ -278,7 +284,7 @@ MODULE_PARM_DESC(noirqdebug, "Disable irq lockup detection when true");
static int __init irqfixup_setup(char *str)
{
- irqfixup = 1;
+ irqfixup = max(irqfixup, IRQFIXUP_MISROUTED);
printk(KERN_WARNING "Misrouted IRQ fixup support enabled.\n");
printk(KERN_WARNING "This may impact system performance.\n");
@@ -290,7 +296,7 @@ module_param(irqfixup, int, 0644);
static int __init irqpoll_setup(char *str)
{
- irqfixup = 2;
+ irqfixup = IRQFIXUP_POLL;
printk(KERN_WARNING "Misrouted IRQ fixup and polling support "
"enabled\n");
printk(KERN_WARNING "This may significantly impact system "
--
1.6.4.2
--
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