/*
 * mm/percpu-km.c - kernel memory based chunk allocation
 *
 * Copyright (C) 2010		SUSE Linux Products GmbH
 * Copyright (C) 2010		Tejun Heo <tj@kernel.org>
 *
 * This file is released under the GPLv2.
 *
 * Chunks are allocated as a contiguous kernel memory using gfp
 * allocation.  This is to be used on nommu architectures.
 *
 * To use percpu-km,
 *
 * - define CONFIG_NEED_PER_CPU_KM from the arch Kconfig.
 *
 * - CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK must not be defined.  It's
 *   not compatible with PER_CPU_KM.  EMBED_FIRST_CHUNK should work
 *   fine.
 *
 * - NUMA is not supported.  When setting up the first chunk,
 *   @cpu_distance_fn should be NULL or report all CPUs to be nearer
 *   than or at LOCAL_DISTANCE.
 *
 * - It's best if the chunk size is power of two multiple of
 *   PAGE_SIZE.  Because each chunk is allocated as a contiguous
 *   kernel memory block using alloc_pages(), memory will be wasted if
 *   chunk size is not aligned.  percpu-km code will whine about it.
 */

#if defined(CONFIG_SMP) && defined(CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK)
#error "contiguous percpu allocation is incompatible with paged first chunk"
#endif

#include <linux/log2.h>

static int pcpu_populate_chunk(struct pcpu_chunk *chunk,
			       int page_start, int page_end)
{
	return 0;
}

static void pcpu_depopulate_chunk(struct pcpu_chunk *chunk,
				  int page_start, int page_end)
{
	/* nada */
}

static struct pcpu_chunk *pcpu_create_chunk(void)
{
	const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;
	struct pcpu_chunk *chunk;
	struct page *pages;
	int i;

	chunk = pcpu_alloc_chunk();
	if (!chunk)
		return NULL;

	pages = alloc_pages(GFP_KERNEL, order_base_2(nr_pages));
	if (!pages) {
		pcpu_free_chunk(chunk);
		return NULL;
	}

	for (i = 0; i < nr_pages; i++)
		pcpu_set_page_chunk(nth_page(pages, i), chunk);

	chunk->data = pages;
	chunk->base_addr = page_address(pages) - pcpu_group_offsets[0];

	spin_lock_irq(&pcpu_lock);
	pcpu_chunk_populated(chunk, 0, nr_pages);
	spin_unlock_irq(&pcpu_lock);

	return chunk;
}

static void pcpu_destroy_chunk(struct pcpu_chunk *chunk)
{
	const int nr_pages = pcpu_group_sizes[0] >> PAGE_SHIFT;

	if (chunk && chunk->data)
		__free_pages(chunk->data, order_base_2(nr_pages));
	pcpu_free_chunk(chunk);
}

static struct page *pcpu_addr_to_page(void *addr)
{
	return virt_to_page(addr);
}

static int __init pcpu_verify_alloc_info(const struct pcpu_alloc_info *ai)
{
	size_t nr_pages, alloc_pages;

	/* all units must be in a single group */
	if (ai->nr_groups != 1) {
		pr_crit("can't handle more than one group\n");
		return -EINVAL;
	}

	nr_pages = (ai->groups[0].nr_units * ai->unit_size) >> PAGE_SHIFT;
	alloc_pages = roundup_pow_of_two(nr_pages);

	if (alloc_pages > nr_pages)
		pr_warn("wasting %zu pages per chunk\n",
			alloc_pages - nr_pages);

	return 0;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>uapi</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/sound?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>hdspm.h</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='83280e90ef001f77a64e2ce59c25ab66e47ab1f0'/><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>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-08 11:42:04 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-08 11:42:04 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>83280e90ef001f77a64e2ce59c25ab66e47ab1f0</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/uapi/sound/hdspm.h?id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>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=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>ec0a5842e2fbc0f4abaff55299acac397b8da5c3</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>include/uapi/sound/hdspm.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=cc250e267bd56c531b0bee455fc724d50af83fac'>cc250e267bd56c531b0bee455fc724d50af83fac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0&amp;id2=cc250e267bd56c531b0bee455fc724d50af83fac'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=0a8fd1346254974c3a852338508e4a4cddbb35f1'>0a8fd1346254974c3a852338508e4a4cddbb35f1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/uapi/sound/hdspm.h?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0&amp;id2=0a8fd1346254974c3a852338508e4a4cddbb35f1'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'usb-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb</div><div class='commit-msg'>Pull USB fixes from Greg KH:
 "Here are a bunch of USB fixes for 4.10-rc3. Yeah, it's a lot, an
  artifact of the holiday break I think.

  Lots of gadget and the usual XHCI fixups for reported issues (one day
  that driver will calm down...) Also included are a bunch of usb-serial
  driver fixes, and for good measure, a number of much-reported MUSB
  driver issues have finally been resolved.

  All of these have been in linux-next with no reported issues"

* tag 'usb-4.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (72 commits)
  USB: fix problems with duplicate endpoint addresses
  usb: ohci-at91: use descriptor-based gpio APIs correctly
  usb: storage: unusual_uas: Add JMicron JMS56x to unusual device
  usb: hub: Move hub_port_disable() to fix warning if PM is disabled
  usb: musb: blackfin: add bfin_fifo_offset in bfin_ops
  usb: musb: fix compilation warning on unused function
  usb: musb: Fix trying to free already-free IRQ 4
  usb: musb: dsps: implement clear_ep_rxintr() callback
  usb: musb: core: add clear_ep_rxintr() to musb_platform_ops
  USB: serial: ti_usb_3410_5052: fix NULL-deref at open
  USB: serial: spcp8x5: fix NULL-deref at open
  USB: serial: quatech2: fix sleep-while-atomic in close
  USB: serial: pl2303: fix NULL-deref at open
  USB: serial: oti6858: fix NULL-deref at open
  USB: serial: omninet: fix NULL-derefs at open and disconnect
  USB: serial: mos7840: fix misleading interrupt-URB comment
  USB: serial: mos7840: remove unused write URB
  USB: serial: mos7840: fix NULL-deref at open
  USB: serial: mos7720: remove obsolete port initialisation
  USB: serial: mos7720: fix parallel probe
  ...
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=83280e90ef001f77a64e2ce59c25ab66e47ab1f0'>Diffstat</a> (limited to 'include/uapi/sound/hdspm.h')</div><table summary='diffstat' class='diffstat'>