From ef4cf365c1d839c800542beadfc06992fbc69905 Mon Sep 17 00:00:00 2001
From: Josh Boyer <jwboyer@redhat.com>
Date: Mar 12 2012 18:58:06 +0000
Subject: Make the irqpoll patch less chatty (rhbz 800520)


Should look at making the frequency of checking dynamic, but this will help
the immediate problem.

---

diff --git a/unhandled-irqs-switch-to-polling.patch b/unhandled-irqs-switch-to-polling.patch
index 8eb0905..6eeaf0b 100644
--- a/unhandled-irqs-switch-to-polling.patch
+++ b/unhandled-irqs-switch-to-polling.patch
@@ -140,16 +140,16 @@ every time during debugging).
 
 
 Signed-off-by: Jeroen Van den Keybus <jeroen.vandenkeybus@gmail.com>
+
+Make it less chatty.  Josh Boyer <jwboyer@redhat.com>
 ======
 
-diff -up linux-3.2-rc4.orig/kernel/irq/spurious.c
-linux-3.2-rc4/kernel/irq/spurious.c
---- linux-3.2-rc4.orig/kernel/irq/spurious.c	2011-12-01 23:56:01.000000000 +0100
-+++ linux-3.2-rc4/kernel/irq/spurious.c	2011-12-11 16:14:48.188377387 +0100
+--- linux-2.6.orig/kernel/irq/spurious.c
++++ linux-2.6/kernel/irq/spurious.c
 @@ -18,7 +18,7 @@
-
+ 
  static int irqfixup __read_mostly;
-
+ 
 -#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/10)
 +#define POLL_SPURIOUS_IRQ_INTERVAL (HZ/100)
  static void poll_spurious_irqs(unsigned long dummy);
@@ -161,42 +161,37 @@ linux-3.2-rc4/kernel/irq/spurious.c
  	struct irq_desc *desc;
 -	int i;
 +	int i, poll_again;
-
+ 
  	if (atomic_inc_return(&irq_poll_active) != 1)
  		goto out;
  	irq_poll_cpu = smp_processor_id();
-
+ 
 +	poll_again = 0; /* Will stay false as long as no polling candidate is found */
  	for_each_irq_desc(i, desc) {
 -		unsigned int state;
 +		unsigned int state, irq;
-
+ 
  		if (!i)
  			 continue;
-@@ -158,15 +159,33 @@ static void poll_spurious_irqs(unsigned
- 		barrier();
+@@ -159,14 +160,29 @@ static void poll_spurious_irqs(unsigned
  		if (!(state & IRQS_SPURIOUS_DISABLED))
  			continue;
--
+ 
 -		local_irq_disable();
 -		try_one_irq(i, desc, true);
 -		local_irq_enable();
-+		
 +		/* We end up here with a disabled spurious interrupt.
 +		   desc->irqs_unhandled now tracks the number of times
 +		   the interrupt has been polled */
 +
 +		irq = desc->irq_data.irq;
 +		if (desc->irqs_unhandled < 100) { /* 1 second delay with poll frequency 100 Hz */
-+			if (desc->irqs_unhandled == 0)
-+				printk("Polling IRQ %d\n", irq);
 +			local_irq_disable();
 +			try_one_irq(i, desc, true);
 +			local_irq_enable();
 +			desc->irqs_unhandled++;
 +			poll_again = 1;
 +		} else {
-+			printk("Reenabling IRQ %d\n", irq);
 +			irq_enable(desc); /* Reenable the interrupt line */
 +			desc->depth--;
 +			desc->istate &= (~IRQS_SPURIOUS_DISABLED);
@@ -211,11 +206,11 @@ linux-3.2-rc4/kernel/irq/spurious.c
 -	mod_timer(&poll_spurious_irq_timer,
 -		  jiffies + POLL_SPURIOUS_IRQ_INTERVAL);
  }
-
+ 
  static inline int bad_action_ret(irqreturn_t action_ret)
-@@ -177,11 +196,19 @@ static inline int bad_action_ret(irqretu
+@@ -177,11 +193,19 @@ static inline int bad_action_ret(irqretu
  }
-
+ 
  /*
 - * If 99,900 of the previous 100,000 interrupts have not been handled
 + * If 9 of the previous 10 interrupts have not been handled
@@ -235,14 +230,14 @@ linux-3.2-rc4/kernel/irq/spurious.c
   *  functioning device sharing an IRQ with the failing one)
   */
  static void
-@@ -302,19 +329,19 @@ void note_interrupt(unsigned int irq, st
+@@ -302,19 +326,19 @@ void note_interrupt(unsigned int irq, st
  	}
-
+ 
  	desc->irq_count++;
 -	if (likely(desc->irq_count < 100000))
 +	if (likely(desc->irq_count < 10))
  		return;
-
+ 
  	desc->irq_count = 0;
 -	if (unlikely(desc->irqs_unhandled > 99900)) {
 +	if (unlikely(desc->irqs_unhandled >= 9)) {
@@ -259,11 +254,3 @@ linux-3.2-rc4/kernel/irq/spurious.c
  		desc->istate |= IRQS_SPURIOUS_DISABLED;
  		desc->depth++;
  		irq_disable(desc);
-
-======
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