Messages in this thread Patch in this message | | | Date | Fri, 08 Sep 2006 12:22:38 -0700 | From | Kevin Hilman <> | Subject | [PATCH -rt] use SA_NODELAY for XScale PMU interrupts |
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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>
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 @@ -14,12 +14,14 @@ * @author Zwane Mwaikambo */
-/* #define DEBUG */ +#define DEBUG #include <linux/types.h> #include <linux/errno.h> #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);
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