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Message-Id: <20231121021840.10937-1-longman@redhat.com>
Date: Mon, 20 Nov 2023 21:18:40 -0500
From: Waiman Long <longman@...hat.com>
To: Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>
Cc: cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
Waiman Long <longman@...hat.com>,
kernel test robot <lkp@...el.com>
Subject: [PATCH-cgroup] workqueue: Move workqueue_set_unbound_cpumask() and its helpers inside CONFIG_SYSFS
Commit fe28f631fa94 ("workqueue: Add workqueue_unbound_exclude_cpumask()
to exclude CPUs from wq_unbound_cpumask") makes
workqueue_set_unbound_cpumask() static as it is not used elsewhere in
the kernel. However, this triggers a kernel test robot warning about
'workqueue_set_unbound_cpumask' defined but not used when CONFIG_SYS
isn't defined. It happens that workqueue_set_unbound_cpumask() is only
called when CONFIG_SYS is defined.
Move workqueue_set_unbound_cpumask() and its helpers inside the
CONFIG_SYSFS compilation block to avoid the warning. There is no
functional change.
Fixes: fe28f631fa94 ("workqueue: Add workqueue_unbound_exclude_cpumask() to exclude CPUs from wq_unbound_cpumask")
Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311130831.uh0AoCd1-lkp@intel.com/
Signed-off-by: Waiman Long <longman@...hat.com>
---
kernel/workqueue.c | 102 ++++++++++++++++++++++-----------------------
1 file changed, 51 insertions(+), 51 deletions(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index bd9d34eacd78..2fc585d3d6ca 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4417,19 +4417,6 @@ static void apply_wqattrs_commit(struct apply_wqattrs_ctx *ctx)
mutex_unlock(&ctx->wq->mutex);
}
-static void apply_wqattrs_lock(void)
-{
- /* CPUs should stay stable across pwq creations and installations */
- cpus_read_lock();
- mutex_lock(&wq_pool_mutex);
-}
-
-static void apply_wqattrs_unlock(void)
-{
- mutex_unlock(&wq_pool_mutex);
- cpus_read_unlock();
-}
-
static int apply_workqueue_attrs_locked(struct workqueue_struct *wq,
const struct workqueue_attrs *attrs)
{
@@ -5833,44 +5820,6 @@ static int workqueue_apply_unbound_cpumask(const cpumask_var_t unbound_cpumask)
return ret;
}
-/**
- * workqueue_set_unbound_cpumask - Set the low-level unbound cpumask
- * @cpumask: the cpumask to set
- *
- * The low-level workqueues cpumask is a global cpumask that limits
- * the affinity of all unbound workqueues. This function check the @cpumask
- * and apply it to all unbound workqueues and updates all pwqs of them.
- *
- * Return: 0 - Success
- * -EINVAL - Invalid @cpumask
- * -ENOMEM - Failed to allocate memory for attrs or pwqs.
- */
-static int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
-{
- int ret = -EINVAL;
-
- /*
- * Not excluding isolated cpus on purpose.
- * If the user wishes to include them, we allow that.
- */
- cpumask_and(cpumask, cpumask, cpu_possible_mask);
- if (!cpumask_empty(cpumask)) {
- apply_wqattrs_lock();
- cpumask_copy(wq_requested_unbound_cpumask, cpumask);
- if (cpumask_equal(cpumask, wq_unbound_cpumask)) {
- ret = 0;
- goto out_unlock;
- }
-
- ret = workqueue_apply_unbound_cpumask(cpumask);
-
-out_unlock:
- apply_wqattrs_unlock();
- }
-
- return ret;
-}
-
/**
* workqueue_unbound_exclude_cpumask - Exclude given CPUs from unbound cpumask
* @exclude_cpumask: the cpumask to be excluded from wq_unbound_cpumask
@@ -6027,6 +5976,19 @@ static struct attribute *wq_sysfs_attrs[] = {
};
ATTRIBUTE_GROUPS(wq_sysfs);
+static void apply_wqattrs_lock(void)
+{
+ /* CPUs should stay stable across pwq creations and installations */
+ cpus_read_lock();
+ mutex_lock(&wq_pool_mutex);
+}
+
+static void apply_wqattrs_unlock(void)
+{
+ mutex_unlock(&wq_pool_mutex);
+ cpus_read_unlock();
+}
+
static ssize_t wq_nice_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -6203,6 +6165,44 @@ static struct bus_type wq_subsys = {
.dev_groups = wq_sysfs_groups,
};
+/**
+ * workqueue_set_unbound_cpumask - Set the low-level unbound cpumask
+ * @cpumask: the cpumask to set
+ *
+ * The low-level workqueues cpumask is a global cpumask that limits
+ * the affinity of all unbound workqueues. This function check the @cpumask
+ * and apply it to all unbound workqueues and updates all pwqs of them.
+ *
+ * Return: 0 - Success
+ * -EINVAL - Invalid @cpumask
+ * -ENOMEM - Failed to allocate memory for attrs or pwqs.
+ */
+static int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
+{
+ int ret = -EINVAL;
+
+ /*
+ * Not excluding isolated cpus on purpose.
+ * If the user wishes to include them, we allow that.
+ */
+ cpumask_and(cpumask, cpumask, cpu_possible_mask);
+ if (!cpumask_empty(cpumask)) {
+ apply_wqattrs_lock();
+ cpumask_copy(wq_requested_unbound_cpumask, cpumask);
+ if (cpumask_equal(cpumask, wq_unbound_cpumask)) {
+ ret = 0;
+ goto out_unlock;
+ }
+
+ ret = workqueue_apply_unbound_cpumask(cpumask);
+
+out_unlock:
+ apply_wqattrs_unlock();
+ }
+
+ return ret;
+}
+
static ssize_t __wq_cpumask_show(struct device *dev,
struct device_attribute *attr, char *buf, cpumask_var_t mask)
{
--
2.39.3
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