/* 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;
}
ink_up()</title>
<updated>2020-02-26T10:07:42+00:00</updated>
<author>
<name>Russell King</name>
<email>rmk+kernel@armlinux.org.uk</email>
</author>
<published>2020-02-21T20:19:23+00:00</published>
<link rel='alternate' type='text/html' href='http://git.armlinux.org.uk/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=f96b64978af540dc7278c16b161d09e08cf13e00'/>
<id>f96b64978af540dc7278c16b161d09e08cf13e00</id>
<content type='text'>
Propagate the resolved link parameters via the mac_link_up() call for
MACs that do not automatically track their PCS state. We propagate the
link parameters via function arguments so that inappropriate members
of struct phylink_link_state can't be accessed, and creating a new
structure just for this adds needless complexity to the API.

Tested-by: Andre Przywara &lt;andre.przywara@arm.com&gt;
Tested-by: Alexandre Belloni &lt;alexandre.belloni@bootlin.com&gt;
Tested-by: Vladimir Oltean &lt;vladimir.oltean@nxp.com&gt;
Signed-off-by: Russell King &lt;rmk+kernel@armlinux.org.uk&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Propagate the resolved link parameters via the mac_link_up() call for
MACs that do not automatically track their PCS state. We propagate the
link parameters via function arguments so that inappropriate members
of struct phylink_link_state can't be accessed, and creating a new
structure just for this adds needless complexity to the API.

Tested-by: Andre Przywara &lt;andre.przywara@arm.com&gt;
Tested-by: Alexandre Belloni &lt;alexandre.belloni@bootlin.com&gt;
Tested-by: Vladimir Oltean &lt;vladimir.oltean@nxp.com&gt;
Signed-off-by: Russell King &lt;rmk+kernel@armlinux.org.uk&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>net: page_pool: API cleanup and comments</title>
<updated>2020-02-20T18:09:25+00:00</updated>
<author>
<name>Ilias Apalodimas</name>
<email>ilias.apalodimas@linaro.org</email>
</author>
<published>2020-02-20T07:41:55+00:00</published>
<link rel='alternate' type='text/html' href='http://git.armlinux.org.uk/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=458de8a97f107e1b6120d608b93ae9e3de019a2e'/>
<id>458de8a97f107e1b6120d608b93ae9e3de019a2e</id>
<content type='text'>
Functions starting with __ usually indicate those which are exported,
but should not be called directly. Update some of those declared in the
API and make it more readable.

page_pool_unmap_page() and page_pool_release_page() were doing
exactly the same thing calling __page_pool_clean_page().  Let's
rename __page_pool_clean_page() to page_pool_release_page() and
export it in order to show up on perf logs and get rid of
page_pool_unmap_page().

Finally rename __page_pool_put_page() to page_pool_put_page() since we
can now directly call it from drivers and rename the existing
page_pool_put_page() to page_pool_put_full_page() since they do the same
thing but the latter is trying to sync the full DMA area.

This patch also updates netsec, mvneta and stmmac drivers which use
those functions.

Suggested-by: Jonathan Lemon &lt;jonathan.lemon@gmail.com&gt;
Acked-by: Toke Høiland-Jørgensen &lt;toke@redhat.com&gt;
Acked-by: Jesper Dangaard Brouer &lt;brouer@redhat.com&gt;
Signed-off-by: Ilias Apalodimas &lt;ilias.apalodimas@linaro.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Functions starting with __ usually indicate those which are exported,
but should not be called directly. Update some of those declared in the
API and make it more readable.

page_pool_unmap_page() and page_pool_release_page() were doing
exactly the same thing calling __page_pool_clean_page().  Let's
rename __page_pool_clean_page() to page_pool_release_page() and
export it in order to show up on perf logs and get rid of
page_pool_unmap_page().

Finally rename __page_pool_put_page() to page_pool_put_page() since we
can now directly call it from drivers and rename the existing
page_pool_put_page() to page_pool_put_full_page() since they do the same
thing but the latter is trying to sync the full DMA area.

This patch also updates netsec, mvneta and stmmac drivers which use
those functions.

Suggested-by: Jonathan Lemon &lt;jonathan.lemon@gmail.com&gt;
Acked-by: Toke Høiland-Jørgensen &lt;toke@redhat.com&gt;
Acked-by: Jesper Dangaard Brouer &lt;brouer@redhat.com&gt;
Signed-off-by: Ilias Apalodimas &lt;ilias.apalodimas@linaro.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>net: mvneta: align xdp stats naming scheme to mlx5 driver</title>
<updated>2020-02-19T18:54:14+00:00</updated>
<author>
<name>Lorenzo Bianconi</name>
<email>lorenzo@kernel.org</email>
</author>
<published>2020-02-19T09:57:37+00:00</published>
<link rel='alternate' type='text/html' href='http://git.armlinux.org.uk/cgit/git.armlinux.org.uk/linux-net-next.git/commit/?id=7d51a01599d5285fc94fa4fcea10afabfa9ca5a4'/>
<id>7d51a01599d5285fc94fa4fcea10afabfa9ca5a4</id>
<content type='text'>
Introduce "rx" prefix in the name scheme for xdp counters
on rx path.
Differentiate between XDP_TX and ndo_xdp_xmit counters

Signed-off-by: Lorenzo Bianconi &lt;lorenzo@kernel.org&gt;
Acked-by: Jesper Dangaard Brouer &lt;brouer@redhat.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
Introduce "rx" prefix in the name scheme for xdp counters
on rx path.
Differentiate between XDP_TX and ndo_xdp_xmit counters

Signed-off-by: Lorenzo Bianconi &lt;lorenzo@kernel.org&gt;
Acked-by: Jesper Dangaard Brouer &lt;brouer@redhat.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</pre>
</div>
</content>
</entry>