xen: remove unused balloon.h

#include <asm/tlb.h>

#include <xen/interface/memory.h>

#include <xen/balloon.h>

#include <xen/xenbus.h>

#include <xen/features.h>

#include <xen/page.h>

/******************************************************************************

 * balloon.h

 *

 * Xen balloon driver - enables returning/claiming memory to/from Xen.

 *

 * Copyright (c) 2003, B Dragovic

 * Copyright (c) 2003-2004, M Williamson, K Fraser

 *

 * 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; or, when distributed

 * separately from the Linux kernel or incorporated into other

 * software packages, subject to the following license:

 *

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this source file (the "Software"), to deal in the Software without

 * restriction, including without limitation the rights to use, copy, modify,

 * merge, publish, distribute, sublicense, and/or sell copies of the Software,

 * and to permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 */

#ifndef __XEN_BALLOON_H__

#define __XEN_BALLOON_H__

#include <linux/spinlock.h>

#if 0

/*

 * Inform the balloon driver that it should allow some slop for device-driver

 * memory activities.

 */

void balloon_update_driver_allowance(long delta);

/* Allocate/free a set of empty pages in low memory (i.e., no RAM mapped). */

struct page **alloc_empty_pages_and_pagevec(int nr_pages);

void free_empty_pages_and_pagevec(struct page **pagevec, int nr_pages);

void balloon_release_driver_page(struct page *page);

/*

 * Prevent the balloon driver from changing the memory reservation during

 * a driver critical region.

 */

extern spinlock_t balloon_lock;

#define balloon_lock(__flags)   spin_lock_irqsave(&balloon_lock, __flags)

#define balloon_unlock(__flags) spin_unlock_irqrestore(&balloon_lock, __flags)

#endif

#endif /* __XEN_BALLOON_H__ */