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Commit 6cc88bc4 authored by David Howells's avatar David Howells Committed by James Morris
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CRED: Rename is_single_threaded() to is_wq_single_threaded() 



Rename is_single_threaded() to is_wq_single_threaded() so that a new
is_single_threaded() can be created that refers to tasks rather than
waitqueues.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Reviewed-by: default avatarJames Morris <jmorris@namei.org>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent bb952bb9

kernel/workqueue.c

+4 −4
Original line number Diff line number Diff line
@@ -84,21 +84,21 @@ static cpumask_t cpu_singlethread_map __read_mostly; 
static cpumask_t cpu_populated_map __read_mostly;



/* If it's single threaded, it isn't in the list of workqueues. */

static inline int is_single_threaded(struct workqueue_struct *wq)

static inline int is_wq_single_threaded(struct workqueue_struct *wq)

{

	return wq->singlethread;

}



static const cpumask_t *wq_cpu_map(struct workqueue_struct *wq)

{

	return is_single_threaded(wq)

	return is_wq_single_threaded(wq)

		? &cpu_singlethread_map : &cpu_populated_map;

}



static

struct cpu_workqueue_struct *wq_per_cpu(struct workqueue_struct *wq, int cpu)

{

	if (unlikely(is_single_threaded(wq)))

	if (unlikely(is_wq_single_threaded(wq)))

		cpu = singlethread_cpu;

	return per_cpu_ptr(wq->cpu_wq, cpu);

}
@@ -769,7 +769,7 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu) 
{

	struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };

	struct workqueue_struct *wq = cwq->wq;

	const char *fmt = is_single_threaded(wq) ? "%s" : "%s/%d";

	const char *fmt = is_wq_single_threaded(wq) ? "%s" : "%s/%d";

	struct task_struct *p;



	p = kthread_create(worker_thread, cwq, fmt, wq->name, cpu);

lib/is_single_threaded.c

0 → 100644
+45 −0
Original line number Diff line number Diff line 
/* Function to determine if a thread group is single threaded or not

 *

 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.

 * Written by David Howells (dhowells@redhat.com)

 * - Derived from security/selinux/hooks.c

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public Licence

 * as published by the Free Software Foundation; either version

 * 2 of the Licence, or (at your option) any later version.

 */



#include <linux/sched.h>



/**

 * is_single_threaded - Determine if a thread group is single-threaded or not

 * @p: A task in the thread group in question

 *

 * This returns true if the thread group to which a task belongs is single

 * threaded, false if it is not.

 */

bool is_single_threaded(struct task_struct *p)

{

	struct task_struct *g, *t;

	struct mm_struct *mm = p->mm;



	if (atomic_read(&p->signal->count) != 1)

		goto no;



	if (atomic_read(&p->mm->mm_users) != 1) {

		read_lock(&tasklist_lock);

		do_each_thread(g, t) {

			if (t->mm == mm && t != p)

				goto no_unlock;

		} while_each_thread(g, t);

		read_unlock(&tasklist_lock);

	}



	return true;



no_unlock:

	read_unlock(&tasklist_lock);

no:

	return false;

}