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| author | Li Zefan <lizefan@huawei.com> | 2013-08-21 10:22:28 +0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-08-21 08:40:27 -0400 |
| commit | 1c09b195d37fa459844036f429a0f378e70c3db6 (patch) | |
| tree | f5a489a926304b07a982ea61a7ea8ebeaf253653 /kernel/cpuset.c | |
| parent | a903f0865a190f8778c73df1a810ea6e25e5d7cf (diff) | |
| download | op-kernel-dev-1c09b195d37fa459844036f429a0f378e70c3db6.zip op-kernel-dev-1c09b195d37fa459844036f429a0f378e70c3db6.tar.gz | |
cpuset: fix a regression in validating config change
It's not allowed to clear masks of a cpuset if there're tasks in it,
but it's broken:
# mkdir /cgroup/sub
# echo 0 > /cgroup/sub/cpuset.cpus
# echo 0 > /cgroup/sub/cpuset.mems
# echo $$ > /cgroup/sub/tasks
# echo > /cgroup/sub/cpuset.cpus
(should fail)
This bug was introduced by commit 88fa523bff295f1d60244a54833480b02f775152
("cpuset: allow to move tasks to empty cpusets").
tj: Dropped temp bool variables and nestes the conditionals directly.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cpuset.c')
| -rw-r--r-- | kernel/cpuset.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 010a008..ea1966d 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -475,13 +475,17 @@ static int validate_change(const struct cpuset *cur, const struct cpuset *trial) /* * Cpusets with tasks - existing or newly being attached - can't - * have empty cpus_allowed or mems_allowed. + * be changed to have empty cpus_allowed or mems_allowed. */ ret = -ENOSPC; - if ((cgroup_task_count(cur->css.cgroup) || cur->attach_in_progress) && - (cpumask_empty(trial->cpus_allowed) && - nodes_empty(trial->mems_allowed))) - goto out; + if ((cgroup_task_count(cur->css.cgroup) || cur->attach_in_progress)) { + if (!cpumask_empty(cur->cpus_allowed) && + cpumask_empty(trial->cpus_allowed)) + goto out; + if (!nodes_empty(cur->mems_allowed) && + nodes_empty(trial->mems_allowed)) + goto out; + } ret = 0; out: |
