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workqueue: Move workqueue_set_unbound_cpumask() and its helpers inside CONFIG_SYSFS

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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@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311130831.uh0AoCd1-lkp@intel.com/
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Waiman Long 2023-11-20 21:18:40 -05:00 committed by Tejun Heo
parent e76d28bdf9
commit 49277a5b76
1 changed files with 51 additions and 51 deletions
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102
kernel/workqueue.c
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@ -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)
{