linux-kernel - [PATCH -queue v0 2/6] [loongson] oprofile: avoid do_IRQ for perfcounter when the interrupt is from bonito

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Message-Id: <061879e220036f930cd1cf5a6d22fca4d2be255c.1257325319.git.wuzhangjin@gmail.com>
Date:	Wed,  4 Nov 2009 17:05:08 +0800
From:	Wu Zhangjin <wuzhangjin@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Wu Zhangjin <wuzhangjin@...il.com>, linux-mips@...ux-mips.org,
	LKML <linux-kernel@...r.kernel.org>, huhb@...ote.com,
	yanh@...ote.com, Zhang Le <r0bertz@...too.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Nicholas Mc Guire <der.herr@...r.at>, zhangfx@...ote.com,
	liujl@...ote.com
Subject: [PATCH -queue v0 2/6] [loongson] oprofile: avoid do_IRQ for perfcounter when the interrupt is from bonito

In loongson2f, the IP6 is shared by bonito and perfcounter, we need to
avoid do_IRQ for perfcounter when the interrupt is from bonito. This
patch does it.

Signed-off-by: Wu Zhangjin <wuzhangjin@...il.com>
---
 arch/mips/oprofile/op_model_loongson2.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/mips/oprofile/op_model_loongson2.c b/arch/mips/oprofile/op_model_loongson2.c
index 575cd14..08d4b09 100644
--- a/arch/mips/oprofile/op_model_loongson2.c
+++ b/arch/mips/oprofile/op_model_loongson2.c
@@ -125,6 +125,9 @@ static irqreturn_t loongson2_perfcount_handler(int irq, void *dev_id)
 	 */
 
 	/* Check whether the irq belongs to me */
+	enabled = read_c0_perfcnt() & LOONGSON2_PERFCNT_INT_EN;
+	if (!enabled)
+		return IRQ_NONE;
 	enabled = reg.cnt1_enabled | reg.cnt2_enabled;
 	if (!enabled)
 		return IRQ_NONE;
-- 
1.6.2.1

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