diff options
| author | Zefan Li <lizefan@huawei.com> | 2015-02-13 11:20:30 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-26 13:59:42 +0100 |
| commit | 9b1c6e3aac08700162cd8d0588b73e8a278b6e2f (patch) | |
| tree | 6f2a4619f5f83cf922928c2641829c9d41dadbe0 /kernel | |
| parent | fbbca5e8cc61da1665212b97745b9898eeab8045 (diff) | |
cpuset: fix a warning when clearing configured masks in old hierarchy
commit 79063bffc81f82689bd90e16da1b49408f3bf095 upstream.
When we clear cpuset.cpus, cpuset.effective_cpus won't be cleared:
# mount -t cgroup -o cpuset xxx /mnt
# mkdir /mnt/tmp
# echo 0 > /mnt/tmp/cpuset.cpus
# echo > /mnt/tmp/cpuset.cpus
# cat cpuset.cpus
# cat cpuset.effective_cpus
0-15
And a kernel warning in update_cpumasks_hier() is triggered:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 4028 at kernel/cpuset.c:894 update_cpumasks_hier+0x471/0x650()
Signed-off-by: Zefan Li <lizefan@huawei.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/cpuset.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cpuset.c b/kernel/cpuset.c index 7e9d71130015..29463c26c83f 100644 --- a/kernel/cpuset.c +++ b/kernel/cpuset.c @@ -873,7 +873,7 @@ static void update_cpumasks_hier(struct cpuset *cs, struct cpumask *new_cpus) * If it becomes empty, inherit the effective mask of the * parent, which is guaranteed to have some CPUs. */ - if (cpumask_empty(new_cpus)) + if (cgroup_on_dfl(cp->css.cgroup) && cpumask_empty(new_cpus)) cpumask_copy(new_cpus, parent->effective_cpus); /* Skip the whole subtree if the cpumask remains the same. */ @@ -1129,7 +1129,7 @@ static void update_nodemasks_hier(struct cpuset *cs, nodemask_t *new_mems) * If it becomes empty, inherit the effective mask of the * parent, which is guaranteed to have some MEMs. */ - if (nodes_empty(*new_mems)) + if (cgroup_on_dfl(cp->css.cgroup) && nodes_empty(*new_mems)) *new_mems = parent->effective_mems; /* Skip the whole subtree if the nodemask remains the same. */ |