From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752914AbcAPVSV (ORCPT ); Sat, 16 Jan 2016 16:18:21 -0500 Received: from terminus.zytor.com ([198.137.202.10]:56571 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752889AbcAPVSS (ORCPT ); Sat, 16 Jan 2016 16:18:18 -0500 Date: Sat, 16 Jan 2016 13:17:14 -0800 From: tip-bot for Thomas Gleixner Message-ID: Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, joe.lawrence@stratus.com, tglx@linutronix.de, jmmahler@gmail.com, bp@alien8.de, jiang.liu@linux.intel.com, hpa@zytor.com, linux@roeck-us.net Reply-To: bp@alien8.de, hpa@zytor.com, jiang.liu@linux.intel.com, tglx@linutronix.de, jmmahler@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, joe.lawrence@stratus.com, linux@roeck-us.net In-Reply-To: <20151231160106.403491024@linutronix.de> References: <20151231160106.403491024@linutronix.de> To: linux-tip-commits@vger.kernel.org Subject: [tip:x86/urgent] x86/irq: Reorganize the return path in assign_irq_vector Git-Commit-ID: 433cbd57d190a1cdd02f243df41c3d7f55ec4b94 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: 433cbd57d190a1cdd02f243df41c3d7f55ec4b94 Gitweb: http://git.kernel.org/tip/433cbd57d190a1cdd02f243df41c3d7f55ec4b94 Author: Thomas Gleixner AuthorDate: Thu, 31 Dec 2015 16:30:46 +0000 Committer: Thomas Gleixner CommitDate: Fri, 15 Jan 2016 13:43:59 +0100 x86/irq: Reorganize the return path in assign_irq_vector Use an explicit goto for the cases where we have success in the search/update and return -ENOSPC if the search loop ends due to no space. Preparatory patch for fixes. No functional change. Signed-off-by: Thomas Gleixner Tested-by: Borislav Petkov Tested-by: Joe Lawrence Cc: Jiang Liu Cc: Jeremiah Mahler Cc: andy.shevchenko@gmail.com Cc: Guenter Roeck Cc: stable@vger.kernel.org #4.3+ Link: http://lkml.kernel.org/r/20151231160106.403491024@linutronix.de Signed-off-by: Thomas Gleixner --- arch/x86/kernel/apic/vector.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index 19082cf..613b1cd 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -118,13 +118,12 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, */ static int current_vector = FIRST_EXTERNAL_VECTOR + VECTOR_OFFSET_START; static int current_offset = VECTOR_OFFSET_START % 16; - int cpu, err; + int cpu; if (d->move_in_progress) return -EBUSY; /* Only try and allocate irqs on cpus that are present */ - err = -ENOSPC; cpumask_clear(d->old_domain); cpumask_clear(searched_cpumask); cpu = cpumask_first_and(mask, cpu_online_mask); @@ -134,9 +133,8 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, apic->vector_allocation_domain(cpu, vector_cpumask, mask); if (cpumask_subset(vector_cpumask, d->domain)) { - err = 0; if (cpumask_equal(vector_cpumask, d->domain)) - break; + goto success; /* * New cpumask using the vector is a proper subset of * the current in use mask. So cleanup the vector @@ -147,7 +145,7 @@ static int __assign_irq_vector(int irq, struct apic_chip_data *d, d->move_in_progress = cpumask_intersects(d->old_domain, cpu_online_mask); cpumask_and(d->domain, d->domain, vector_cpumask); - break; + goto success; } vector = current_vector; @@ -187,17 +185,13 @@ next: per_cpu(vector_irq, new_cpu)[vector] = irq_to_desc(irq); d->cfg.vector = vector; cpumask_copy(d->domain, vector_cpumask); - err = 0; - break; + goto success; } + return -ENOSPC; - if (!err) { - /* cache destination APIC IDs into cfg->dest_apicid */ - err = apic->cpu_mask_to_apicid_and(mask, d->domain, - &d->cfg.dest_apicid); - } - - return err; +success: + /* cache destination APIC IDs into cfg->dest_apicid */ + return apic->cpu_mask_to_apicid_and(mask, d->domain, &d->cfg.dest_apicid); } static int assign_irq_vector(int irq, struct apic_chip_data *data,