#include <linux/user-return-notifier.h>
#include <linux/percpu.h>
#include <linux/sched.h>
#include <linux/export.h>

static DEFINE_PER_CPU(struct hlist_head, return_notifier_list);

/*
 * Request a notification when the current cpu returns to userspace.  Must be
 * called in atomic context.  The notifier will also be called in atomic
 * context.
 */
void user_return_notifier_register(struct user_return_notifier *urn)
{
	set_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
	hlist_add_head(&urn->link, this_cpu_ptr(&return_notifier_list));
}
EXPORT_SYMBOL_GPL(user_return_notifier_register);

/*
 * Removes a registered user return notifier.  Must be called from atomic
 * context, and from the same cpu registration occurred in.
 */
void user_return_notifier_unregister(struct user_return_notifier *urn)
{
	hlist_del(&urn->link);
	if (hlist_empty(this_cpu_ptr(&return_notifier_list)))
		clear_tsk_thread_flag(current, TIF_USER_RETURN_NOTIFY);
}
EXPORT_SYMBOL_GPL(user_return_notifier_unregister);

/* Calls registered user return notifiers */
void fire_user_return_notifiers(void)
{
	struct user_return_notifier *urn;
	struct hlist_node *tmp2;
	struct hlist_head *head;

	head = &get_cpu_var(return_notifier_list);
	hlist_for_each_entry_safe(urn, tmp2, head, link)
		urn->on_user_return(urn);
	put_cpu_var(return_notifier_list);
}
it' 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=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/tools/perf/tests/Build?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/tests/Build?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/tests/Build?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/tests/Build?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/perf/tests/Build'>
<input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='eeee74a4f6625b77c3e8db0693c2d4546507ba0d'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>perf</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/tests?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>tests</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/tests/Build?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d'>Build</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/tools/perf/tests/Build?h=nds-private-remove&amp;id=eeee74a4f6625b77c3e8db0693c2d4546507ba0d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>