/* 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;
}
 value='switch'/></form></td></tr>
<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=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/net/vmw_vsock/Makefile?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/net/vmw_vsock/Makefile?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/net/vmw_vsock/Makefile?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/vmw_vsock/Makefile?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/vmw_vsock/Makefile'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/vmw_vsock?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>vmw_vsock</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/vmw_vsock/Makefile?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e'>Makefile</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/vmw_vsock/Makefile?h=nds-private-remove&amp;id=cbda794cf1bb2f4a2e75e11fda1f89457169772e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
ption><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:54:39 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-24 16:54:39 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/acpi/acuuid.h?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>883af14e67e8b8702b5560aa64c888c0cd0bd66c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/acpi/acuuid.h?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>74e3a6b53f5fad9f7848ab1b9f6921b7012940a4</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/acpi/acuuid.h?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>include/acpi/acuuid.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/acpi/acuuid.h?id=0263d4ebd94b36280608e296cba39b924b6e832b'>0263d4ebd94b36280608e296cba39b924b6e832b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/acpi/acuuid.h?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c&amp;id2=0263d4ebd94b36280608e296cba39b924b6e832b'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/acpi/acuuid.h?id=aab45453ff5c77200c6da4ac909f7a4392aed17e'>aab45453ff5c77200c6da4ac909f7a4392aed17e</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/acpi/acuuid.h?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c&amp;id2=aab45453ff5c77200c6da4ac909f7a4392aed17e'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'akpm' (patches from Andrew)</div><div class='commit-msg'>Merge fixes from Andrew Morton:
 "26 fixes"

* emailed patches from Andrew Morton &lt;akpm@linux-foundation.org&gt;: (26 commits)
  MAINTAINERS: add Dan Streetman to zbud maintainers
  MAINTAINERS: add Dan Streetman to zswap maintainers
  mm: do not export ioremap_page_range symbol for external module
  mn10300: fix build error of missing fpu_save()
  romfs: use different way to generate fsid for BLOCK or MTD
  frv: add missing atomic64 operations
  mm, page_alloc: fix premature OOM when racing with cpuset mems update
  mm, page_alloc: move cpuset seqcount checking to slowpath
  mm, page_alloc: fix fast-path race with cpuset update or removal
  mm, page_alloc: fix check for NULL preferred_zone
  kernel/panic.c: add missing \n
  fbdev: color map copying bounds checking
  frv: add atomic64_add_unless()
  mm/mempolicy.c: do not put mempolicy before using its nodemask
  radix-tree: fix private list warnings
  Documentation/filesystems/proc.txt: add VmPin
  mm, memcg: do not retry precharge charges
  proc: add a schedule point in proc_pid_readdir()
  mm: alloc_contig: re-allow CMA to compact FS pages
  mm/slub.c: trace free objects at KERN_INFO
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=883af14e67e8b8702b5560aa64c888c0cd0bd66c'>Diffstat</a> (limited to 'include/acpi/acuuid.h')</div><table summary='diffstat' class='diffstat'>