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cpumask: convert kernel/workqueue.c

Browse source 
Impact: Reduce memory usage, use new cpumask API.

cpu_populated_map becomes a cpumask_var_t, and cpu_singlethread_map is
simply a cpumask pointer: it's simply the cpumask containing the first
possible CPU anyway.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2009-01-01 10:12:25 +10:30
parent a45185d2d7
commit e7577c50f2
1 changed files with 14 additions and 12 deletions
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26
kernel/workqueue.c
View file

@ -73,7 +73,7 @@ static DEFINE_SPINLOCK(workqueue_lock);
static LIST_HEAD(workqueues);
static int singlethread_cpu __read_mostly;
static cpumask_t cpu_singlethread_map __read_mostly;
static const struct cpumask *cpu_singlethread_map __read_mostly;
/*
* _cpu_down() first removes CPU from cpu_online_map, then CPU_DEAD
* flushes cwq->worklist. This means that flush_workqueue/wait_on_work
@ -81,7 +81,7 @@ static cpumask_t cpu_singlethread_map __read_mostly;
* use cpu_possible_map, the cpumask below is more a documentation
* than optimization.
*/
static cpumask_t cpu_populated_map __read_mostly;
static cpumask_var_t cpu_populated_map __read_mostly;
/* If it's single threaded, it isn't in the list of workqueues. */
static inline int is_wq_single_threaded(struct workqueue_struct *wq)
@ -89,10 +89,10 @@ static inline int is_wq_single_threaded(struct workqueue_struct *wq)
return wq->singlethread;
}
static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)
static const struct cpumask *wq_cpu_map(struct workqueue_struct *wq)
{
return is_wq_single_threaded(wq)
? &cpu_singlethread_map : &cpu_populated_map;
? cpu_singlethread_map : cpu_populated_map;
}
static
@ -410,7 +410,7 @@ static int flush_cpu_workqueue(struct cpu_workqueue_struct *cwq)
*/
void flush_workqueue(struct workqueue_struct *wq)
{
const cpumask_t *cpu_map = wq_cpu_map(wq);
const struct cpumask *cpu_map = wq_cpu_map(wq);
int cpu;
might_sleep();
@ -532,7 +532,7 @@ static void wait_on_work(struct work_struct *work)
{
struct cpu_workqueue_struct *cwq;
struct workqueue_struct *wq;
const cpumask_t *cpu_map;
const struct cpumask *cpu_map;
int cpu;
might_sleep();
@ -903,7 +903,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
*/
void destroy_workqueue(struct workqueue_struct *wq)
{
const cpumask_t *cpu_map = wq_cpu_map(wq);
const struct cpumask *cpu_map = wq_cpu_map(wq);
int cpu;
cpu_maps_update_begin();
@ -933,7 +933,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
switch (action) {
case CPU_UP_PREPARE:
cpu_set(cpu, cpu_populated_map);
cpumask_set_cpu(cpu, cpu_populated_map);
}
undo:
list_for_each_entry(wq, &workqueues, list) {
@ -964,7 +964,7 @@ undo:
switch (action) {
case CPU_UP_CANCELED:
case CPU_POST_DEAD:
cpu_clear(cpu, cpu_populated_map);
cpumask_clear_cpu(cpu, cpu_populated_map);
}
return ret;
@ -1017,9 +1017,11 @@ EXPORT_SYMBOL_GPL(work_on_cpu);
void __init init_workqueues(void)
{
cpu_populated_map = cpu_online_map;
singlethread_cpu = first_cpu(cpu_possible_map);
cpu_singlethread_map = cpumask_of_cpu(singlethread_cpu);
alloc_cpumask_var(&cpu_populated_map, GFP_KERNEL);
cpumask_copy(cpu_populated_map, cpu_online_mask);
singlethread_cpu = cpumask_first(cpu_possible_mask);
cpu_singlethread_map = cpumask_of(singlethread_cpu);
hotcpu_notifier(workqueue_cpu_callback, 0);
keventd_wq = create_workqueue("events");
BUG_ON(!keventd_wq);