openwrtv4/target/linux/lantiq/patches/0009-MIPS-make-oprofile-use-cp0_perfcount_irq-if-it-is-se.patch

From 88bb1794592e3fe9c8d65ce73ee851e11dbbd26b Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Wed, 24 Aug 2011 13:24:11 +0200
Subject: [PATCH 09/24] MIPS: make oprofile use cp0_perfcount_irq if it is set

The patch makes the oprofile code use the performance counters irq.

This patch is written by Felix Fietkau.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
---
 arch/mips/oprofile/op_model_mipsxx.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

--- a/arch/mips/oprofile/op_model_mipsxx.c
+++ b/arch/mips/oprofile/op_model_mipsxx.c
@@ -303,6 +303,11 @@ static irqreturn_t mipsxx_perfcount_int(
 	return mipsxx_perfcount_handler();
 }
 
+static irqreturn_t mipsxx_perfcount_int(int irq, void *dev_id)
+{
+	return mipsxx_perfcount_handler();
+}
+
 static int __init mipsxx_init(void)
 {
 	int counters;
@@ -383,6 +388,10 @@ static int __init mipsxx_init(void)
 		return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
 			IRQF_SHARED, "Perfcounter", save_perf_irq);
 
+	if (cp0_perfcount_irq >= 0)
+		return request_irq(cp0_perfcount_irq, mipsxx_perfcount_int,
+			IRQF_SHARED, "Perfcounter", save_perf_irq);
+
 	return 0;
 }
 
@@ -392,6 +401,9 @@ static void mipsxx_exit(void)
 
 	if (cp0_perfcount_irq >= 0)
 		free_irq(cp0_perfcount_irq, save_perf_irq);
+
+	if (cp0_perfcount_irq >= 0)
+		free_irq(cp0_perfcount_irq, save_perf_irq);
 
 	counters = counters_per_cpu_to_total(counters);
 	on_each_cpu(reset_counters, (void *)(long)counters, 1);