/* 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>

/*
 * Returns true if the task does not share ->mm with another thread/process.
 */
bool current_is_single_threaded(void)
{
	struct task_struct *task = current;
	struct mm_struct *mm = task->mm;
	struct task_struct *p, *t;
	bool ret;

	if (atomic_read(&task->signal->live) != 1)
		return false;

	if (atomic_read(&mm->mm_users) == 1)
		return true;

	ret = false;
	rcu_read_lock();
	for_each_process(p) {
		if (unlikely(p->flags & PF_KTHREAD))
			continue;
		if (unlikely(p == task->group_leader))
			continue;

		for_each_thread(p, t) {
			if (unlikely(t->mm == mm))
				goto found;
			if (likely(t->mm))
				break;
			/*
			 * t->mm == NULL. Make sure next_thread/next_task
			 * will see other CLONE_VM tasks which might be
			 * forked before exiting.
			 */
			smp_rmb();
		}
	}
	ret = true;
found:
	rcu_read_unlock();

	return ret;
}
option>
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<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
<table class='tabs'><tr><td>
<a href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>refs</a><a href='/cgit.cgi/linux/net-next.git/log/sound/firewire/tascam/tascam.c?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/sound/firewire/tascam/tascam.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/firewire?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>firewire</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/firewire/tascam?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>tascam</a>/<a href='/cgit.cgi/linux/net-next.git/commit/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>tascam.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Johannes Berg &lt;johannes.berg@intel.com&gt;</td><td class='right'>2017-02-07 10:40:50 +0100</td></tr>
<tr><th>committer</th><td>Johannes Berg &lt;johannes.berg@intel.com&gt;</td><td class='right'>2017-02-07 10:40:50 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/firewire/tascam/tascam.c?id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>0021fe481f8acf3694d92d72f3dd1b2a71a20ca3</a> /<a href='/cgit.cgi/linux/net-next.git/tree/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>sound/firewire/tascam/tascam.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>228c8c6b1f4376788e9d5ab00d50b10228eb40d3</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/firewire/tascam/tascam.c?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a&amp;id2=228c8c6b1f4376788e9d5ab00d50b10228eb40d3'>diff</a>)</td></tr></table>
<div class='commit-subject'>mac80211: add back lost debugfs files</div><div class='commit-msg'>Somehow these files were never present or lost, but the code
is there and they seem somewhat useful, so add them back.

Signed-off-by: Johannes Berg &lt;johannes.berg@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=bddb2afcb6c52a545f18fb9bcd4829828ebf4a3a'>Diffstat</a> (limited to 'sound/firewire/tascam/tascam.c')</div><table summary='diffstat' class='diffstat'>