From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sasha Levin Subject: [PATCH AUTOSEL 4.14 10/40] genirq: Make sure the initial affinity is not empty Date: Thu, 14 Feb 2019 21:12:43 -0500 Message-ID: <20190215021313.178476-10-sashal@kernel.org> References: <20190215021313.178476-1-sashal@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190215021313.178476-1-sashal@kernel.org> Sender: stable-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Srinivas Ramana , Thomas Gleixner , linux-arm-msm@vger.kernel.org, Sasha Levin List-Id: linux-arm-msm@vger.kernel.org From: Srinivas Ramana [ Upstream commit bddda606ec76550dd63592e32a6e87e7d32583f7 ] If all CPUs in the irq_default_affinity mask are offline when an interrupt is initialized then irq_setup_affinity() can set an empty affinity mask for a newly allocated interrupt. Fix this by falling back to cpu_online_mask in case the resulting affinity mask is zero. Signed-off-by: Srinivas Ramana Signed-off-by: Thomas Gleixner Cc: linux-arm-msm@vger.kernel.org Link: https://lkml.kernel.org/r/1545312957-8504-1-git-send-email-sramana@codeaurora.org Signed-off-by: Sasha Levin --- kernel/irq/manage.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 4cd85870f00e..6c877d28838f 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -360,6 +360,9 @@ int irq_setup_affinity(struct irq_desc *desc) } cpumask_and(&mask, cpu_online_mask, set); + if (cpumask_empty(&mask)) + cpumask_copy(&mask, cpu_online_mask); + if (node != NUMA_NO_NODE) { const struct cpumask *nodemask = cpumask_of_node(node); -- 2.19.1