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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-12-16 20:04:39 +0300
committerIngo Molnar <mingo@elte.hu>2009-12-16 21:01:57 +0300
commit881232b70b195768a71cd74ff4b4e8ab9502997b (patch)
treeaeafe0a28a7163af445e4f603ab1075c3608c375 /kernel/kthread.c
parent5da9a0fb673a0ea0a093862f95f6b89b3390c31e (diff)
downloadlinux-881232b70b195768a71cd74ff4b4e8ab9502997b.tar.xz
sched: Move kthread_bind() back to kthread.c
Since kthread_bind() lost its dependencies on sched.c, move it back where it came from. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> LKML-Reference: <20091216170518.039524041@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/kthread.c')
-rw-r--r--kernel/kthread.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index ab7ae57773e1..fbb6222fe7e0 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -150,6 +150,29 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
EXPORT_SYMBOL(kthread_create);
/**
+ * kthread_bind - bind a just-created kthread to a cpu.
+ * @p: thread created by kthread_create().
+ * @cpu: cpu (might not be online, must be possible) for @k to run on.
+ *
+ * Description: This function is equivalent to set_cpus_allowed(),
+ * except that @cpu doesn't need to be online, and the thread must be
+ * stopped (i.e., just returned from kthread_create()).
+ */
+void kthread_bind(struct task_struct *p, unsigned int cpu)
+{
+ /* Must have done schedule() in kthread() before we set_task_cpu */
+ if (!wait_task_inactive(p, TASK_UNINTERRUPTIBLE)) {
+ WARN_ON(1);
+ return;
+ }
+
+ p->cpus_allowed = cpumask_of_cpu(cpu);
+ p->rt.nr_cpus_allowed = 1;
+ p->flags |= PF_THREAD_BOUND;
+}
+EXPORT_SYMBOL(kthread_bind);
+
+/**
* kthread_stop - stop a thread created by kthread_create().
* @k: thread created by kthread_create().
*