From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754804AbaHEFjW (ORCPT ); Tue, 5 Aug 2014 01:39:22 -0400 Received: from mail1.windriver.com ([147.11.146.13]:44241 "EHLO mail1.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753095AbaHEFjV (ORCPT ); Tue, 5 Aug 2014 01:39:21 -0400 From: To: CC: , , , , , , Subject: [PATCH v1] MIPS: perf: Mark pmu interupt IRQF_NO_THREAD Date: Tue, 5 Aug 2014 13:37:47 +0800 Message-ID: <1407217067-1144-1-git-send-email-Wei.Yang@windriver.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yang Wei 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: [] dump_stack+0x1c/0x50 [] __might_sleep+0x13c/0x148 [] rt_spin_lock+0x3c/0xb0 [] __wake_up+0x3c/0x80 [] perf_event_wakeup+0x8c/0xf8 [] perf_pending_event+0x40/0x78 [] irq_work_run+0x74/0xc0 [] mipsxx_pmu_handle_shared_irq+0x110/0x228 [] mipsxx_pmu_handle_irq+0x14/0x30 [] handle_irq_event_percpu+0xbc/0x470 [] handle_percpu_irq+0x98/0xc8 [] generic_handle_irq+0x4c/0x68 [] do_IRQ+0x2c/0x48 [] plat_irq_dispatch+0x64/0xd0 Signed-off-by: Yang Wei --- 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