workqueue: consistently use int for @cpu variables
Workqueue is mixing unsigned int and int for @cpu variables. There's
no point in using unsigned int for cpus - many of cpu related APIs
take int anyway. Consistently use int for @cpu variables so that we
can use negative values to mark special ones.
This patch doesn't introduce any visible behavior changes.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index 5bd030f..899be66 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -435,7 +435,7 @@
extern void workqueue_set_max_active(struct workqueue_struct *wq,
int max_active);
-extern bool workqueue_congested(unsigned int cpu, struct workqueue_struct *wq);
+extern bool workqueue_congested(int cpu, struct workqueue_struct *wq);
extern unsigned int work_busy(struct work_struct *work);
/*
@@ -466,12 +466,12 @@
}
#ifndef CONFIG_SMP
-static inline long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
+static inline long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
{
return fn(arg);
}
#else
-long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg);
+long work_on_cpu(int cpu, long (*fn)(void *), void *arg);
#endif /* CONFIG_SMP */
#ifdef CONFIG_FREEZER
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 26c67c7..73c5f68 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -124,7 +124,7 @@
struct worker_pool {
spinlock_t lock; /* the pool lock */
- unsigned int cpu; /* I: the associated cpu */
+ int cpu; /* I: the associated cpu */
int id; /* I: pool ID */
unsigned int flags; /* X: flags */
@@ -467,8 +467,7 @@
return &pools[highpri];
}
-static struct pool_workqueue *get_pwq(unsigned int cpu,
- struct workqueue_struct *wq)
+static struct pool_workqueue *get_pwq(int cpu, struct workqueue_struct *wq)
{
if (!(wq->flags & WQ_UNBOUND)) {
if (likely(cpu < nr_cpu_ids))
@@ -730,7 +729,7 @@
* CONTEXT:
* spin_lock_irq(rq->lock)
*/
-void wq_worker_waking_up(struct task_struct *task, unsigned int cpu)
+void wq_worker_waking_up(struct task_struct *task, int cpu)
{
struct worker *worker = kthread_data(task);
@@ -755,8 +754,7 @@
* RETURNS:
* Worker task on @cpu to wake up, %NULL if none.
*/
-struct task_struct *wq_worker_sleeping(struct task_struct *task,
- unsigned int cpu)
+struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu)
{
struct worker *worker = kthread_data(task), *to_wakeup = NULL;
struct worker_pool *pool;
@@ -1159,7 +1157,7 @@
return worker && worker->current_pwq->wq == wq;
}
-static void __queue_work(unsigned int cpu, struct workqueue_struct *wq,
+static void __queue_work(int cpu, struct workqueue_struct *wq,
struct work_struct *work)
{
struct pool_workqueue *pwq;
@@ -1714,7 +1712,7 @@
if (pool->cpu != WORK_CPU_UNBOUND)
worker->task = kthread_create_on_node(worker_thread,
worker, cpu_to_node(pool->cpu),
- "kworker/%u:%d%s", pool->cpu, id, pri);
+ "kworker/%d:%d%s", pool->cpu, id, pri);
else
worker->task = kthread_create(worker_thread, worker,
"kworker/u:%d%s", id, pri);
@@ -3345,7 +3343,7 @@
* RETURNS:
* %true if congested, %false otherwise.
*/
-bool workqueue_congested(unsigned int cpu, struct workqueue_struct *wq)
+bool workqueue_congested(int cpu, struct workqueue_struct *wq)
{
struct pool_workqueue *pwq = get_pwq(cpu, wq);
@@ -3461,7 +3459,7 @@
unsigned long action,
void *hcpu)
{
- unsigned int cpu = (unsigned long)hcpu;
+ int cpu = (unsigned long)hcpu;
struct worker_pool *pool;
switch (action & ~CPU_TASKS_FROZEN) {
@@ -3507,7 +3505,7 @@
unsigned long action,
void *hcpu)
{
- unsigned int cpu = (unsigned long)hcpu;
+ int cpu = (unsigned long)hcpu;
struct work_struct unbind_work;
switch (action & ~CPU_TASKS_FROZEN) {
@@ -3547,7 +3545,7 @@
* It is up to the caller to ensure that the cpu doesn't go offline.
* The caller must not hold any locks which would prevent @fn from completing.
*/
-long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
+long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
{
struct work_for_cpu wfc = { .fn = fn, .arg = arg };
@@ -3705,7 +3703,7 @@
static int __init init_workqueues(void)
{
- unsigned int cpu;
+ int cpu;
/* make sure we have enough bits for OFFQ pool ID */
BUILD_BUG_ON((1LU << (BITS_PER_LONG - WORK_OFFQ_POOL_SHIFT)) <
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h
index f9c8877..f116f07 100644
--- a/kernel/workqueue_internal.h
+++ b/kernel/workqueue_internal.h
@@ -59,8 +59,7 @@
* Scheduler hooks for concurrency managed workqueue. Only to be used from
* sched.c and workqueue.c.
*/
-void wq_worker_waking_up(struct task_struct *task, unsigned int cpu);
-struct task_struct *wq_worker_sleeping(struct task_struct *task,
- unsigned int cpu);
+void wq_worker_waking_up(struct task_struct *task, int cpu);
+struct task_struct *wq_worker_sleeping(struct task_struct *task, int cpu);
#endif /* _KERNEL_WORKQUEUE_INTERNAL_H */