Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1638963

[PATCH] workqueue: Ensure that cpumask set for pools created after boot

Show all headers | View raw

On NUMA systems with dynamic processors, the content of the cpumask
may change over time.  As new processors are added via DLPAR operations,
workqueues are created for them.  This patch ensures that the pools
created for new workqueues will be initialized with a cpumask before
the first worker is created, attached, and woken up.  If the mask is
not set up, then the kernel will crash when 'wakeup_process' is unable
to find a valid CPU to which to assign the new worker.

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
---
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c74bf39..6091069 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3366,6 +3366,8 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs)
 	copy_workqueue_attrs(pool->attrs, attrs);
 	pool->node = target_node;
 
+	cpumask_copy(pool->attrs->cpumask, cpumask_of(smp_processor_id()));
+
 	/*
 	 * no_numa isn't a worker_pool attribute, always clear it.  See
 	 * 'struct workqueue_attrs' comments for detail.

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] workqueue: Ensure that cpumask set for pools created after  boot Michael Bringmann <mwb@linux.vnet.ibm.com> - 2017-05-10 18:50 +0200
  Re: [PATCH] workqueue: Ensure that cpumask set for pools created  after boot Tejun Heo <tj@kernel.org> - 2017-05-10 19:40 +0200

csiph-web