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cpumask: convert rcutorture.c

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We're getting rid of cpumasks on the stack.

Simply change tmp_mask to a global, and allocate it in
rcu_torture_init().

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@freedesktop.org>
This commit is contained in:
Rusty Russell 2009-03-30 22:05:16 -06:00
parent aa85ea5b89
commit 73d0a4b107
1 changed files with 17 additions and 8 deletions
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25
kernel/rcutorture.c
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@ -126,6 +126,7 @@ static atomic_t n_rcu_torture_mberror;
static atomic_t n_rcu_torture_error;
static long n_rcu_torture_timers = 0;
static struct list_head rcu_torture_removed;
static cpumask_var_t shuffle_tmp_mask;
static int stutter_pause_test = 0;
@ -889,10 +890,9 @@ static int rcu_idle_cpu; /* Force all torture tasks off this CPU */
*/
static void rcu_torture_shuffle_tasks(void)
{
cpumask_t tmp_mask;
int i;
cpus_setall(tmp_mask);
cpumask_setall(shuffle_tmp_mask);
get_online_cpus();
/* No point in shuffling if there is only one online CPU (ex: UP) */
@ -902,29 +902,29 @@ static void rcu_torture_shuffle_tasks(void)
}
if (rcu_idle_cpu != -1)
cpu_clear(rcu_idle_cpu, tmp_mask);
cpumask_clear_cpu(rcu_idle_cpu, shuffle_tmp_mask);
set_cpus_allowed_ptr(current, &tmp_mask);
set_cpus_allowed_ptr(current, shuffle_tmp_mask);
if (reader_tasks) {
for (i = 0; i < nrealreaders; i++)
if (reader_tasks[i])
set_cpus_allowed_ptr(reader_tasks[i],
&tmp_mask);
shuffle_tmp_mask);
}
if (fakewriter_tasks) {
for (i = 0; i < nfakewriters; i++)
if (fakewriter_tasks[i])
set_cpus_allowed_ptr(fakewriter_tasks[i],
&tmp_mask);
shuffle_tmp_mask);
}
if (writer_task)
set_cpus_allowed_ptr(writer_task, &tmp_mask);
set_cpus_allowed_ptr(writer_task, shuffle_tmp_mask);
if (stats_task)
set_cpus_allowed_ptr(stats_task, &tmp_mask);
set_cpus_allowed_ptr(stats_task, shuffle_tmp_mask);
if (rcu_idle_cpu == -1)
rcu_idle_cpu = num_online_cpus() - 1;
@ -1012,6 +1012,7 @@ rcu_torture_cleanup(void)
if (shuffler_task) {
VERBOSE_PRINTK_STRING("Stopping rcu_torture_shuffle task");
kthread_stop(shuffler_task);
free_cpumask_var(shuffle_tmp_mask);
}
shuffler_task = NULL;
@ -1190,10 +1191,18 @@ rcu_torture_init(void)
}
if (test_no_idle_hz) {
rcu_idle_cpu = num_online_cpus() - 1;
if (!alloc_cpumask_var(&shuffle_tmp_mask, GFP_KERNEL)) {
firsterr = -ENOMEM;
VERBOSE_PRINTK_ERRSTRING("Failed to alloc mask");
goto unwind;
}
/* Create the shuffler thread */
shuffler_task = kthread_run(rcu_torture_shuffle, NULL,
"rcu_torture_shuffle");
if (IS_ERR(shuffler_task)) {
free_cpumask_var(shuffle_tmp_mask);
firsterr = PTR_ERR(shuffler_task);
VERBOSE_PRINTK_ERRSTRING("Failed to create shuffler");
shuffler_task = NULL;