Commit-ID: 5a98d36112f4301f068b638d6e0db2357f7deb75
Gitweb: http://git.kernel.org/tip/5a98d36112f4301f068b638d6e0db2357f7deb75
Author: Dhaval Giani <dhaval@xxxxxxxxxxxxxxxxxx>
AuthorDate: Thu, 12 Mar 2009 23:15:01 +0530
Commit: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Fri, 13 Mar 2009 00:21:25 +0100
cpuset: Check if the cpus allowed is a subset of the cpuset's cpus for PF_THREAD_BOUND threads
When a kernel thread which has been bound to a CPU is moved to
a cpuset which is a superset of the CPU it is bound to, the
movement fails.
[root@llm11 cgroups]# mkdir a
[root@llm11 cgroups]# echo 3 > a/cpuset.cpus
[root@llm11 cgroups]# echo 0 > a/cpuset.mems
[root@llm11 cgroups]# echo 12 > a/tasks
[root@llm11 cgroups]# echo 12 > tasks
-bash: echo: write error: Invalid argument
[root@llm11 cgroups]# cat cpuset.cpus
0-7
[root@llm11 cgroups]#
(pid 12 is the migration thread bound to CPU 3)
Change the check to see if the cpus allowed is a subset of the
cpus allowed for that cpuset.
Signed-off-by: Dhaval Giani <dhaval@xxxxxxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Srivatsa Vaddagiri <vatsa@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: menage@xxxxxxxxxx
LKML-Reference: <20090312174501.GA7821@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
kernel/cpuset.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index f76db9d..34cfd46 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1362,7 +1362,7 @@ static int cpuset_can_attach(struct cgroup_subsys *ss,
if (tsk->flags & PF_THREAD_BOUND) {
mutex_lock(&callback_mutex);
- if (!cpumask_equal(&tsk->cpus_allowed, cs->cpus_allowed))
+ if (!cpumask_subset(&tsk->cpus_allowed, cs->cpus_allowed))
ret = -EINVAL;
mutex_unlock(&callback_mutex);
}
--
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