/*
 * Scheduler code and data structures related to cpufreq.
 *
 * Copyright (C) 2016, Intel Corporation
 * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include "sched.h"

DEFINE_PER_CPU(struct update_util_data *, cpufreq_update_util_data);

/**
 * cpufreq_add_update_util_hook - Populate the CPU's update_util_data pointer.
 * @cpu: The CPU to set the pointer for.
 * @data: New pointer value.
 * @func: Callback function to set for the CPU.
 *
 * Set and publish the update_util_data pointer for the given CPU.
 *
 * The update_util_data pointer of @cpu is set to @data and the callback
 * function pointer in the target struct update_util_data is set to @func.
 * That function will be called by cpufreq_update_util() from RCU-sched
 * read-side critical sections, so it must not sleep.  @data will always be
 * passed to it as the first argument which allows the function to get to the
 * target update_util_data structure and its container.
 *
 * The update_util_data pointer of @cpu must be NULL when this function is
 * called or it will WARN() and return with no effect.
 */
void cpufreq_add_update_util_hook(int cpu, struct update_util_data *data,
			void (*func)(struct update_util_data *data, u64 time,
				     unsigned int flags))
{
	if (WARN_ON(!data || !func))
		return;

	if (WARN_ON(per_cpu(cpufreq_update_util_data, cpu)))
		return;

	data->func = func;
	rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), data);
}
EXPORT_SYMBOL_GPL(cpufreq_add_update_util_hook);

/**
 * cpufreq_remove_update_util_hook - Clear the CPU's update_util_data pointer.
 * @cpu: The CPU to clear the pointer for.
 *
 * Clear the update_util_data pointer for the given CPU.
 *
 * Callers must use RCU-sched callbacks to free any memory that might be
 * accessed via the old update_util_data pointer or invoke synchronize_sched()
 * right after this function to avoid use-after-free.
 */
void cpufreq_remove_update_util_hook(int cpu)
{
	rcu_assign_pointer(per_cpu(cpufreq_update_util_data, cpu), NULL);
}
EXPORT_SYMBOL_GPL(cpufreq_remove_update_util_hook);
/bond_alb.h'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/net/bond_alb.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>bond_alb.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='dfef358bd1beb4e7b5c94eca944be9cd23dfc752'/><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>Christoph Hellwig &lt;hch@lst.de&gt;</td><td class='right'>2017-01-30 13:15:41 +0100</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-02-02 10:35:46 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/bond_alb.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>dfef358bd1beb4e7b5c94eca944be9cd23dfc752</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/net/bond_alb.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>b9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/net/bond_alb.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>include/net/bond_alb.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/net/bond_alb.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/net/bond_alb.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752&amp;id2=030305d69fc6963c16003f50d7e8d74b02d0a143'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/MSI: Don't apply affinity if there aren't enough vectors left</div><div class='commit-msg'>Bart reported a problem wіth an out of bounds access in the low-level IRQ
affinity code, which we root caused to the qla2xxx driver assigning all its
MSI-X vectors to the pre and post vectors, and not having any left for the
actually spread IRQs.

Fix this issue by not asking for affinity assignment when there are no
vectors to assign left.

Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()")
Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com
Reported-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Tested-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>Diffstat</a> (limited to 'include/net/bond_alb.h')</div><table summary='diffstat' class='diffstat'>