From b84ff7d6f1b7f8a43414e74d972ec4c8f3361db4 Mon Sep 17 00:00:00 2001 From: Mike Galbraith Date: Thu, 29 Oct 2009 11:48:30 +0100 Subject: sched: Fix kthread_bind() by moving the body of kthread_bind() to sched.c Eric Paris reported that commit f685ceacab07d3f6c236f04803e2f2f0dbcc5afb causes boot time PREEMPT_DEBUG complaints. [ 4.590699] BUG: using smp_processor_id() in preemptible [00000000] code: rmmod/1314 [ 4.593043] caller is task_hot+0x86/0xd0 Since kthread_bind() messes with scheduler internals, move the body to sched.c, and lock the runqueue. Reported-by: Eric Paris Signed-off-by: Mike Galbraith Tested-by: Eric Paris Cc: Peter Zijlstra LKML-Reference: <1256813310.7574.3.camel@marge.simson.net> [ v2: fix !SMP build and clean up ] Signed-off-by: Ingo Molnar --- kernel/kthread.c | 23 ----------------------- 1 file changed, 23 deletions(-) (limited to 'kernel/kthread.c') diff --git a/kernel/kthread.c b/kernel/kthread.c index 5fe709982caa..ab7ae57773e1 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -149,29 +149,6 @@ struct task_struct *kthread_create(int (*threadfn)(void *data), } EXPORT_SYMBOL(kthread_create); -/** - * kthread_bind - bind a just-created kthread to a cpu. - * @k: 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 *k, unsigned int cpu) -{ - /* Must have done schedule() in kthread() before we set_task_cpu */ - if (!wait_task_inactive(k, TASK_UNINTERRUPTIBLE)) { - WARN_ON(1); - return; - } - set_task_cpu(k, cpu); - k->cpus_allowed = cpumask_of_cpu(cpu); - k->rt.nr_cpus_allowed = 1; - k->flags |= PF_THREAD_BOUND; -} -EXPORT_SYMBOL(kthread_bind); - /** * kthread_stop - stop a thread created by kthread_create(). * @k: thread created by kthread_create(). -- cgit v1.2.3-55-g7522