- We never pass a NULL @cs to these functions.
- The top cpuset always has some online cpus/mems.
Signed-off-by: Li Zefan <lize...@huawei.com>
---
kernel/cpuset.c | 29 +++++++----------------------
1 file changed, 7 insertions(+), 22 deletions(-)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 4a62dcc..6f9d5e0 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -304,53 +304,38 @@ static struct file_system_type cpuset_fs_type = {
/*
* Return in pmask the portion of a cpusets's cpus_allowed that
* are online. If none are online, walk up the cpuset hierarchy
- * until we find one that does have some online cpus. If we get
- * all the way to the top and still haven't found any online cpus,
- * return cpu_online_mask. Or if passed a NULL cs from an exit'ing
- * task, return cpu_online_mask.
+ * until we find one that does have some online cpus. The top
+ * cpuset always has some cpus online.
*
* One way or another, we guarantee to return some non-empty subset
* of cpu_online_mask.
*
* Call with callback_mutex held.
*/
-
static void guarantee_online_cpus(const struct cpuset *cs,
struct cpumask *pmask)
{
- while (cs && !cpumask_intersects(cs->cpus_allowed, cpu_online_mask))
+ while (!cpumask_intersects(cs->cpus_allowed, cpu_online_mask))
cs = parent_cs(cs);
- if (cs)
- cpumask_and(pmask, cs->cpus_allowed, cpu_online_mask);
- else
- cpumask_copy(pmask, cpu_online_mask);
- BUG_ON(!cpumask_intersects(pmask, cpu_online_mask));
+ cpumask_and(pmask, cs->cpus_allowed, cpu_online_mask);
}
/*
* Return in *pmask the portion of a cpusets's mems_allowed that
* are online, with memory. If none are online with memory, walk
* up the cpuset hierarchy until we find one that does have some
- * online mems. If we get all the way to the top and still haven't
- * found any online mems, return node_states[N_MEMORY].
+ * online mems. The top cpuset always has some mems online.
*
* One way or another, we guarantee to return some non-empty subset
* of node_states[N_MEMORY].
*
* Call with callback_mutex held.
*/
-
static void guarantee_online_mems(const struct cpuset *cs, nodemask_t *pmask)
{
- while (cs && !nodes_intersects(cs->mems_allowed,
- node_states[N_MEMORY]))
+ while (!nodes_intersects(cs->mems_allowed, node_states[N_MEMORY]))
cs = parent_cs(cs);
- if (cs)
- nodes_and(*pmask, cs->mems_allowed,
- node_states[N_MEMORY]);
- else
- *pmask = node_states[N_MEMORY];
- BUG_ON(!nodes_intersects(*pmask, node_states[N_MEMORY]));
+ nodes_and(*pmask, cs->mems_allowed, node_states[N_MEMORY]);
}
/*
--
1.8.0.2
--
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