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| author | Shaohua Li <shli@kernel.org> | 2013-08-01 09:56:36 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-08-01 08:36:40 -0400 |
| commit | 2865a8fb44cc32420407362cbda80c10fa09c6b2 (patch) | |
| tree | a4f3ca6dc957b7676610476b35e4342ad9a497d1 /kernel/workqueue.c | |
| parent | c2fda509667b0fda4372a237f5a59ea4570b1627 (diff) | |
| download | lwn-2865a8fb44cc32420407362cbda80c10fa09c6b2.tar.gz lwn-2865a8fb44cc32420407362cbda80c10fa09c6b2.zip | |
workqueue: copy workqueue_attrs with all fields
$echo '0' > /sys/bus/workqueue/devices/xxx/numa
$cat /sys/bus/workqueue/devices/xxx/numa
I got 1. It should be 0, the reason is copy_workqueue_attrs() called
in apply_workqueue_attrs() doesn't copy no_numa field.
Fix it by making copy_workqueue_attrs() copy ->no_numa too. This
would also make get_unbound_pool() set a pool's ->no_numa attribute
according to the workqueue attributes used when the pool was created.
While harmelss, as ->no_numa isn't a pool attribute, this is a bit
confusing. Clear it explicitly.
tj: Updated description and comments a bit.
Signed-off-by: Shaohua Li <shli@fusionio.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
Diffstat (limited to 'kernel/workqueue.c')
| -rw-r--r-- | kernel/workqueue.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 55f5f0afcd0d..726adc84b3ca 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -3416,6 +3416,12 @@ static void copy_workqueue_attrs(struct workqueue_attrs *to, { to->nice = from->nice; cpumask_copy(to->cpumask, from->cpumask); + /* + * Unlike hash and equality test, this function doesn't ignore + * ->no_numa as it is used for both pool and wq attrs. Instead, + * get_unbound_pool() explicitly clears ->no_numa after copying. + */ + to->no_numa = from->no_numa; } /* hash value of the content of @attr */ @@ -3583,6 +3589,12 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs) lockdep_set_subclass(&pool->lock, 1); /* see put_pwq() */ copy_workqueue_attrs(pool->attrs, attrs); + /* + * no_numa isn't a worker_pool attribute, always clear it. See + * 'struct workqueue_attrs' comments for detail. + */ + pool->attrs->no_numa = false; + /* if cpumask is contained inside a NUMA node, we belong to that node */ if (wq_numa_enabled) { for_each_node(node) { |