From: <Wei.Yang@windriver.com>
To: <ralf@linux-mips.org>
Cc: <a.p.zijlstra@chello.nl>, <paulus@samba.org>, <mingo@redhat.com>,
<acme@kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-mips@linux-mips.org>, <wei.yang@windriver.com>
Subject: [PATCH v1] MIPS: perf: Mark pmu interupt IRQF_NO_THREAD
Date: Tue, 5 Aug 2014 13:37:47 +0800 [thread overview]
Message-ID: <1407217067-1144-1-git-send-email-Wei.Yang@windriver.com> (raw)
From: Yang Wei <Wei.Yang@windriver.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@windriver.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
next reply other threads:[~2014-08-05 5:39 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-05 5:37 Wei.Yang [this message]
2014-08-07 11:48 ` [PATCH v1] MIPS: perf: Mark pmu interupt IRQF_NO_THREAD Ralf Baechle
2014-08-07 17:33 ` David Daney
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