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SubjectRe: [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@mvista.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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