linux-kernel - Re: [PATCH -rt] use SA_NODELAY for XScale PMU interrupts

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Message-ID: <4501C87A.70505@mvista.com>
Date:	Fri, 08 Sep 2006 12:46:02 -0700
From:	Kevin Hilman <khilman@...sta.com>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -rt] use SA_NODELAY for XScale PMU interrupts

Kevin Hilman wrote:
> In the XScale oprofile support, the performance monitoring unit (PMU)
> triggers interrupts and the ISR reads out the performance data.  These
> ISRs are currently set to SA_INTERRUPT.  In order to get accurate
> performance and profiling data under PREEMPT_RT, these should use
> SA_NODELAY.  The functions called by this ISR are limited to
> drivers/oprofile functions.
> 
> Patch against 2.6.18-rt8
> 
> Signed-off-by: Kevin Hilman <khilman@...sta.com>

Resend, without the #define DEBUG.

Index: dev/arch/arm/oprofile/op_model_xscale.c
===================================================================
--- dev.orig/arch/arm/oprofile/op_model_xscale.c
+++ dev/arch/arm/oprofile/op_model_xscale.c
@@ -20,6 +20,8 @@
 #include <linux/sched.h>
 #include <linux/oprofile.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
+
 #include <asm/irq.h>
 #include <asm/system.h>

@@ -383,8 +385,9 @@ static int xscale_pmu_start(void)
 {
 	int ret;
 	u32 pmnc = read_pmnc();
+	int irq_flags = SA_INTERRUPT | SA_NODELAY;

-	ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, SA_INTERRUPT,
+	ret = request_irq(XSCALE_PMU_IRQ, xscale_pmu_interrupt, irq_flags,
 			"XScale PMU", (void *)results);

 	if (ret < 0) {
-
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