linux-kernel - [PATCH v1] MIPS: perf: Mark pmu interupt IRQF_NO

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Date:	Tue, 5 Aug 2014 13:37:47 +0800
From:	<Wei.Yang@...driver.com>
To:	<ralf@...ux-mips.org>
CC:	<a.p.zijlstra@...llo.nl>, <paulus@...ba.org>, <mingo@...hat.com>,
	<acme@...nel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mips@...ux-mips.org>, <wei.yang@...driver.com>
Subject: [PATCH v1] MIPS: perf: Mark pmu interupt IRQF_NO_THREAD

From: Yang Wei <Wei.Yang@...driver.com>

In RT kernel, I ran into the following calltrace, so PMU interrupts cannot
be threaded

in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/0
INFO: lockdep is turned off.
Call Trace:
[<ffffffff8088595c>] dump_stack+0x1c/0x50
[<ffffffff801a958c>] __might_sleep+0x13c/0x148
[<ffffffff80891c54>] rt_spin_lock+0x3c/0xb0
[<ffffffff801ad29c>] __wake_up+0x3c/0x80
[<ffffffff80243ba4>] perf_event_wakeup+0x8c/0xf8
[<ffffffff80243c50>] perf_pending_event+0x40/0x78
[<ffffffff8023d88c>] irq_work_run+0x74/0xc0
[<ffffffff80152640>] mipsxx_pmu_handle_shared_irq+0x110/0x228
[<ffffffff8015276c>] mipsxx_pmu_handle_irq+0x14/0x30
[<ffffffff801ffda4>] handle_irq_event_percpu+0xbc/0x470
[<ffffffff80204478>] handle_percpu_irq+0x98/0xc8
[<ffffffff801ff284>] generic_handle_irq+0x4c/0x68
[<ffffffff8089748c>] do_IRQ+0x2c/0x48
[<ffffffff80105864>] plat_irq_dispatch+0x64/0xd0 


Signed-off-by: Yang Wei <Wei.Yang@...driver.com>
---
 arch/mips/kernel/perf_event_mipsxx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
index 811084f..fd16763 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -550,7 +550,7 @@ static int mipspmu_get_irq(void)
 	if (mipspmu.irq >= 0) {
 		/* Request my own irq handler. */
 		err = request_irq(mipspmu.irq, mipsxx_pmu_handle_irq,
-			IRQF_PERCPU | IRQF_NOBALANCING,
+			IRQF_PERCPU | IRQF_NOBALANCING | IRQF_NO_THREAD,
 			"mips_perf_pmu", NULL);
 		if (err) {
 			pr_warning("Unable to request IRQ%d for MIPS "
-- 
1.7.9.5

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