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cpuset: modify cpuset_set_cpus_allowed to use cpumask pointer

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* Modify cpuset_cpus_allowed to return the currently allowed cpuset
    via a pointer argument instead of as the function return value.

  * Use new set_cpus_allowed_ptr function.

  * Cleanup CPU_MASK_ALL and NODE_MASK_ALL uses.

Depends on:
	[sched-devel]: sched: add new set_cpus_allowed_ptr function

Signed-off-by: Mike Travis <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis
2008-04-04 18:11:07 -07:00
committed by Ingo Molnar
parent f70316dace
commit f9a86fcbbb
4 changed files with 26 additions and 30 deletions
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31
kernel/cpuset.c
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@@ -729,7 +729,7 @@ int cpuset_test_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
*/
void cpuset_change_cpumask(struct task_struct *tsk, struct cgroup_scanner *scan)
{
set_cpus_allowed(tsk, (cgroup_cs(scan->cg))->cpus_allowed);
set_cpus_allowed_ptr(tsk, &((cgroup_cs(scan->cg))->cpus_allowed));
}
/**
@@ -1178,7 +1178,7 @@ static void cpuset_attach(struct cgroup_subsys *ss,
mutex_lock(&callback_mutex);
guarantee_online_cpus(cs, &cpus);
set_cpus_allowed(tsk, cpus);
set_cpus_allowed_ptr(tsk, &cpus);
mutex_unlock(&callback_mutex);
from = oldcs->mems_allowed;
@@ -1555,8 +1555,8 @@ static struct cgroup_subsys_state *cpuset_create(
if (is_spread_slab(parent))
set_bit(CS_SPREAD_SLAB, &cs->flags);
set_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
cs->cpus_allowed = CPU_MASK_NONE;
cs->mems_allowed = NODE_MASK_NONE;
cpus_clear(cs->cpus_allowed);
nodes_clear(cs->mems_allowed);
cs->mems_generation = cpuset_mems_generation++;
fmeter_init(&cs->fmeter);
@@ -1625,8 +1625,8 @@ int __init cpuset_init(void)
{
int err = 0;
top_cpuset.cpus_allowed = CPU_MASK_ALL;
top_cpuset.mems_allowed = NODE_MASK_ALL;
cpus_setall(top_cpuset.cpus_allowed);
nodes_setall(top_cpuset.mems_allowed);
fmeter_init(&top_cpuset.fmeter);
top_cpuset.mems_generation = cpuset_mems_generation++;
@@ -1844,6 +1844,7 @@ void __init cpuset_init_smp(void)
* cpuset_cpus_allowed - return cpus_allowed mask from a tasks cpuset.
* @tsk: pointer to task_struct from which to obtain cpuset->cpus_allowed.
* @pmask: pointer to cpumask_t variable to receive cpus_allowed set.
*
* Description: Returns the cpumask_t cpus_allowed of the cpuset
* attached to the specified @tsk. Guaranteed to return some non-empty
@@ -1851,35 +1852,27 @@ void __init cpuset_init_smp(void)
* tasks cpuset.
**/
cpumask_t cpuset_cpus_allowed(struct task_struct *tsk)
void cpuset_cpus_allowed(struct task_struct *tsk, cpumask_t *pmask)
{
cpumask_t mask;
mutex_lock(&callback_mutex);
mask = cpuset_cpus_allowed_locked(tsk);
cpuset_cpus_allowed_locked(tsk, pmask);
mutex_unlock(&callback_mutex);
return mask;
}
/**
* cpuset_cpus_allowed_locked - return cpus_allowed mask from a tasks cpuset.
* Must be called with callback_mutex held.
**/
cpumask_t cpuset_cpus_allowed_locked(struct task_struct *tsk)
void cpuset_cpus_allowed_locked(struct task_struct *tsk, cpumask_t *pmask)
{
cpumask_t mask;
task_lock(tsk);
guarantee_online_cpus(task_cs(tsk), &mask);
guarantee_online_cpus(task_cs(tsk), pmask);
task_unlock(tsk);
return mask;
}
void cpuset_init_current_mems_allowed(void)
{
current->mems_allowed = NODE_MASK_ALL;
nodes_setall(current->mems_allowed);
}
/**