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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /******************************************************************************
  * Xen balloon driver - enables returning/claiming memory to/from Xen.
  *
  * Copyright (c) 2003, B Dragovic
  * Copyright (c) 2003-2004, M Williamson, K Fraser
  * Copyright (c) 2005 Dan M. Smith, IBM Corporation
  * Copyright (c) 2010 Daniel Kiper
  *
  * Memory hotplug support was written by Daniel Kiper. Work on
  * it was sponsored by Google under Google Summer of Code 2010
  * program. Jeremy Fitzhardinge from Citrix was the mentor for
  * this project.
  *
  * 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.
  */
 
 #define pr_fmt(fmt) "xen:" KBUILD_MODNAME ": " fmt
 
 #include <linux/cpu.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/cred.h>
 #include <linux/errno.h>
 #include <linux/freezer.h>
 #include <linux/kthread.h>
 #include <linux/mm.h>
 #include <linux/memblock.h>
 #include <linux/pagemap.h>
 #include <linux/highmem.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/gfp.h>
 #include <linux/notifier.h>
 #include <linux/memory.h>
 #include <linux/memory_hotplug.h>
 #include <linux/percpu-defs.h>
 #include <linux/slab.h>
 #include <linux/sysctl.h>
 #include <linux/moduleparam.h>
 #include <linux/jiffies.h>
 
 #include <asm/page.h>
 #include <asm/tlb.h>
 
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>
 
 #include <xen/xen.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/memory.h>
 #include <xen/balloon.h>
 #include <xen/features.h>
 #include <xen/page.h>
 #include <xen/mem-reservation.h>
 
 #undef MODULE_PARAM_PREFIX
 #define MODULE_PARAM_PREFIX "xen."
 
 static uint __read_mostly balloon_boot_timeout = 180;
 module_param(balloon_boot_timeout, uint, 0444);
 
 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
 static int xen_hotplug_unpopulated;
 
 static struct ctl_table balloon_table[] = {
     {
         .procname   = "hotplug_unpopulated",
         .data       = &xen_hotplug_unpopulated,
         .maxlen     = sizeof(int),
         .mode       = 0644,
         .proc_handler   = proc_dointvec_minmax,
         .extra1         = SYSCTL_ZERO,
         .extra2         = SYSCTL_ONE,
     },
     { }
 };
 
 static struct ctl_table balloon_root[] = {
     {
         .procname   = "balloon",
         .mode       = 0555,
         .child      = balloon_table,
     },
     { }
 };
 
 static struct ctl_table xen_root[] = {
     {
         .procname   = "xen",
         .mode       = 0555,
         .child      = balloon_root,
     },
     { }
 };
 
 #else
 #define xen_hotplug_unpopulated 0
 #endif
 
 /*
  * Use one extent per PAGE_SIZE to avoid to break down the page into
  * multiple frame.
  */
 #define EXTENT_ORDER (fls(XEN_PFN_PER_PAGE) - 1)
 
 /*
  * balloon_thread() state:
  *
  * BP_DONE: done or nothing to do,
  * BP_WAIT: wait to be rescheduled,
  * BP_EAGAIN: error, go to sleep,
  * BP_ECANCELED: error, balloon operation canceled.
  */
 
 static enum bp_state {
     BP_DONE,
     BP_WAIT,
     BP_EAGAIN,
     BP_ECANCELED
 } balloon_state = BP_DONE;
 
 /* Main waiting point for xen-balloon thread. */
 static DECLARE_WAIT_QUEUE_HEAD(balloon_thread_wq);
 
 static DEFINE_MUTEX(balloon_mutex);
 
 struct balloon_stats balloon_stats;
 EXPORT_SYMBOL_GPL(balloon_stats);
 
 /* We increase/decrease in batches which fit in a page */
 static xen_pfn_t frame_list[PAGE_SIZE / sizeof(xen_pfn_t)];
 
 
 /* List of ballooned pages, threaded through the mem_map array. */
 static LIST_HEAD(ballooned_pages);
 static DECLARE_WAIT_QUEUE_HEAD(balloon_wq);
 
 /* When ballooning out (allocating memory to return to Xen) we don't really
    want the kernel to try too hard since that can trigger the oom killer. */
 #define GFP_BALLOON \
     (GFP_HIGHUSER | __GFP_NOWARN | __GFP_NORETRY | __GFP_NOMEMALLOC)
 
 /* balloon_append: add the given page to the balloon. */
 static void balloon_append(struct page *page)
 {
     __SetPageOffline(page);
 
     /* Lowmem is re-populated first, so highmem pages go at list tail. */
     if (PageHighMem(page)) {
         list_add_tail(&page->lru, &ballooned_pages);
         balloon_stats.balloon_high++;
     } else {
         list_add(&page->lru, &ballooned_pages);
         balloon_stats.balloon_low++;
     }
     wake_up(&balloon_wq);
 }
 
 /* balloon_retrieve: rescue a page from the balloon, if it is not empty. */
 static struct page *balloon_retrieve(bool require_lowmem)
 {
     struct page *page;
 
     if (list_empty(&ballooned_pages))
         return NULL;
 
     page = list_entry(ballooned_pages.next, struct page, lru);
     if (require_lowmem && PageHighMem(page))
         return NULL;
     list_del(&page->lru);
 
     if (PageHighMem(page))
         balloon_stats.balloon_high--;
     else
         balloon_stats.balloon_low--;
 
     __ClearPageOffline(page);
     return page;
 }
 
 static struct page *balloon_next_page(struct page *page)
 {
     struct list_head *next = page->lru.next;
     if (next == &ballooned_pages)
         return NULL;
     return list_entry(next, struct page, lru);
 }
 
 static void update_schedule(void)
 {
     if (balloon_state == BP_WAIT || balloon_state == BP_ECANCELED)
         return;
 
     if (balloon_state == BP_DONE) {
         balloon_stats.schedule_delay = 1;
         balloon_stats.retry_count = 1;
         return;
     }
 
     ++balloon_stats.retry_count;
 
     if (balloon_stats.max_retry_count != RETRY_UNLIMITED &&
             balloon_stats.retry_count > balloon_stats.max_retry_count) {
         balloon_stats.schedule_delay = 1;
         balloon_stats.retry_count = 1;
         balloon_state = BP_ECANCELED;
         return;
     }
 
     balloon_stats.schedule_delay <<= 1;
 
     if (balloon_stats.schedule_delay > balloon_stats.max_schedule_delay)
         balloon_stats.schedule_delay = balloon_stats.max_schedule_delay;
 
     balloon_state = BP_EAGAIN;
 }
 
 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
 static void release_memory_resource(struct resource *resource)
 {
     if (!resource)
         return;
 
     /*
      * No need to reset region to identity mapped since we now
      * know that no I/O can be in this region
      */
     release_resource(resource);
     kfree(resource);
 }
 
 static struct resource *additional_memory_resource(phys_addr_t size)
 {
     struct resource *res;
     int ret;
 
     res = kzalloc(sizeof(*res), GFP_KERNEL);
     if (!res)
         return NULL;
 
     res->name = "System RAM";
     res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 
     ret = allocate_resource(&iomem_resource, res,
                 size, 0, -1,
                 PAGES_PER_SECTION * PAGE_SIZE, NULL, NULL);
     if (ret < 0) {
         pr_err("Cannot allocate new System RAM resource\n");
         kfree(res);
         return NULL;
     }
 
     return res;
 }
 
 static enum bp_state reserve_additional_memory(void)
 {
     long credit;
     struct resource *resource;
     int nid, rc;
     unsigned long balloon_hotplug;
 
     credit = balloon_stats.target_pages + balloon_stats.target_unpopulated
         - balloon_stats.total_pages;
 
     /*
      * Already hotplugged enough pages?  Wait for them to be
      * onlined.
      */
     if (credit <= 0)
         return BP_WAIT;
 
     balloon_hotplug = round_up(credit, PAGES_PER_SECTION);
 
     resource = additional_memory_resource(balloon_hotplug * PAGE_SIZE);
     if (!resource)
         goto err;
 
     nid = memory_add_physaddr_to_nid(resource->start);
 
 #ifdef CONFIG_XEN_HAVE_PVMMU
     /*
      * We don't support PV MMU when Linux and Xen is using
      * different page granularity.
      */
     BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
 
         /*
          * add_memory() will build page tables for the new memory so
          * the p2m must contain invalid entries so the correct
          * non-present PTEs will be written.
          *
          * If a failure occurs, the original (identity) p2m entries
          * are not restored since this region is now known not to
          * conflict with any devices.
          */ 
     if (!xen_feature(XENFEAT_auto_translated_physmap)) {
         unsigned long pfn, i;
 
         pfn = PFN_DOWN(resource->start);
         for (i = 0; i < balloon_hotplug; i++) {
             if (!set_phys_to_machine(pfn + i, INVALID_P2M_ENTRY)) {
                 pr_warn("set_phys_to_machine() failed, no memory added\n");
                 goto err;
             }
                 }
     }
 #endif
 
     /*
      * add_memory_resource() will call online_pages() which in its turn
      * will call xen_online_page() callback causing deadlock if we don't
      * release balloon_mutex here. Unlocking here is safe because the
      * callers drop the mutex before trying again.
      */
     mutex_unlock(&balloon_mutex);
     /* add_memory_resource() requires the device_hotplug lock */
     lock_device_hotplug();
     rc = add_memory_resource(nid, resource, MHP_MERGE_RESOURCE);
     unlock_device_hotplug();
     mutex_lock(&balloon_mutex);
 
     if (rc) {
         pr_warn("Cannot add additional memory (%i)\n", rc);
         goto err;
     }
 
     balloon_stats.total_pages += balloon_hotplug;
 
     return BP_WAIT;
   err:
     release_memory_resource(resource);
     return BP_ECANCELED;
 }
 
 static void xen_online_page(struct page *page, unsigned int order)
 {
     unsigned long i, size = (1 << order);
     unsigned long start_pfn = page_to_pfn(page);
     struct page *p;
 
     pr_debug("Online %lu pages starting at pfn 0x%lx\n", size, start_pfn);
     mutex_lock(&balloon_mutex);
     for (i = 0; i < size; i++) {
         p = pfn_to_page(start_pfn + i);
         balloon_append(p);
     }
     mutex_unlock(&balloon_mutex);
 }
 
 static int xen_memory_notifier(struct notifier_block *nb, unsigned long val, void *v)
 {
     if (val == MEM_ONLINE)
         wake_up(&balloon_thread_wq);
 
     return NOTIFY_OK;
 }
 
 static struct notifier_block xen_memory_nb = {
     .notifier_call = xen_memory_notifier,
     .priority = 0
 };
 #else
 static enum bp_state reserve_additional_memory(void)
 {
     balloon_stats.target_pages = balloon_stats.current_pages +
                      balloon_stats.target_unpopulated;
     return BP_ECANCELED;
 }
 #endif /* CONFIG_XEN_BALLOON_MEMORY_HOTPLUG */
 
 static long current_credit(void)
 {
     return balloon_stats.target_pages - balloon_stats.current_pages;
 }
 
 static bool balloon_is_inflated(void)
 {
     return balloon_stats.balloon_low || balloon_stats.balloon_high;
 }
 
 static enum bp_state increase_reservation(unsigned long nr_pages)
 {
     int rc;
     unsigned long i;
     struct page   *page;
 
     if (nr_pages > ARRAY_SIZE(frame_list))
         nr_pages = ARRAY_SIZE(frame_list);
 
     page = list_first_entry_or_null(&ballooned_pages, struct page, lru);
     for (i = 0; i < nr_pages; i++) {
         if (!page) {
             nr_pages = i;
             break;
         }
 
         frame_list[i] = page_to_xen_pfn(page);
         page = balloon_next_page(page);
     }
 
     rc = xenmem_reservation_increase(nr_pages, frame_list);
     if (rc <= 0)
         return BP_EAGAIN;
 
     for (i = 0; i < rc; i++) {
         page = balloon_retrieve(false);
         BUG_ON(page == NULL);
 
         xenmem_reservation_va_mapping_update(1, &page, &frame_list[i]);
 
         /* Relinquish the page back to the allocator. */
         free_reserved_page(page);
     }
 
     balloon_stats.current_pages += rc;
 
     return BP_DONE;
 }
 
 static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
 {
     enum bp_state state = BP_DONE;
     unsigned long i;
     struct page *page, *tmp;
     int ret;
     LIST_HEAD(pages);
 
     if (nr_pages > ARRAY_SIZE(frame_list))
         nr_pages = ARRAY_SIZE(frame_list);
 
     for (i = 0; i < nr_pages; i++) {
         page = alloc_page(gfp);
         if (page == NULL) {
             nr_pages = i;
             state = BP_EAGAIN;
             break;
         }
         adjust_managed_page_count(page, -1);
         xenmem_reservation_scrub_page(page);
         list_add(&page->lru, &pages);
     }
 
     /*
      * Ensure that ballooned highmem pages don't have kmaps.
      *
      * Do this before changing the p2m as kmap_flush_unused()
      * reads PTEs to obtain pages (and hence needs the original
      * p2m entry).
      */
     kmap_flush_unused();
 
     /*
      * Setup the frame, update direct mapping, invalidate P2M,
      * and add to balloon.
      */
     i = 0;
     list_for_each_entry_safe(page, tmp, &pages, lru) {
         frame_list[i++] = xen_page_to_gfn(page);
 
         xenmem_reservation_va_mapping_reset(1, &page);
 
         list_del(&page->lru);
 
         balloon_append(page);
     }
 
     flush_tlb_all();
 
     ret = xenmem_reservation_decrease(nr_pages, frame_list);
     BUG_ON(ret != nr_pages);
 
     balloon_stats.current_pages -= nr_pages;
 
     return state;
 }
 
 /*
  * Stop waiting if either state is BP_DONE and ballooning action is
  * needed, or if the credit has changed while state is not BP_DONE.
  */
 static bool balloon_thread_cond(long credit)
 {
     if (balloon_state == BP_DONE)
         credit = 0;
 
     return current_credit() != credit || kthread_should_stop();
 }
 
 /*
  * As this is a kthread it is guaranteed to run as a single instance only.
  * We may of course race updates of the target counts (which are protected
  * by the balloon lock), or with changes to the Xen hard limit, but we will
  * recover from these in time.
  */
 static int balloon_thread(void *unused)
 {
     long credit;
     unsigned long timeout;
 
     set_freezable();
     for (;;) {
         switch (balloon_state) {
         case BP_DONE:
         case BP_ECANCELED:
             timeout = 3600 * HZ;
             break;
         case BP_EAGAIN:
             timeout = balloon_stats.schedule_delay * HZ;
             break;
         case BP_WAIT:
             timeout = HZ;
             break;
         }
 
         credit = current_credit();
 
         wait_event_freezable_timeout(balloon_thread_wq,
             balloon_thread_cond(credit), timeout);
 
         if (kthread_should_stop())
             return 0;
 
         mutex_lock(&balloon_mutex);
 
         credit = current_credit();
 
         if (credit > 0) {
             if (balloon_is_inflated())
                 balloon_state = increase_reservation(credit);
             else
                 balloon_state = reserve_additional_memory();
         }
 
         if (credit < 0) {
             long n_pages;
 
             n_pages = min(-credit, si_mem_available());
             balloon_state = decrease_reservation(n_pages,
                                  GFP_BALLOON);
             if (balloon_state == BP_DONE && n_pages != -credit &&
                 n_pages < totalreserve_pages)
                 balloon_state = BP_EAGAIN;
         }
 
         update_schedule();
 
         mutex_unlock(&balloon_mutex);
 
         cond_resched();
     }
 }
 
 /* Resets the Xen limit, sets new target, and kicks off processing. */
 void balloon_set_new_target(unsigned long target)
 {
     /* No need for lock. Not read-modify-write updates. */
     balloon_stats.target_pages = target;
     wake_up(&balloon_thread_wq);
 }
 EXPORT_SYMBOL_GPL(balloon_set_new_target);
 
 static int add_ballooned_pages(unsigned int nr_pages)
 {
     enum bp_state st;
 
     if (xen_hotplug_unpopulated) {
         st = reserve_additional_memory();
         if (st != BP_ECANCELED) {
             int rc;
 
             mutex_unlock(&balloon_mutex);
             rc = wait_event_interruptible(balloon_wq,
                    !list_empty(&ballooned_pages));
             mutex_lock(&balloon_mutex);
             return rc ? -ENOMEM : 0;
         }
     }
 
     if (si_mem_available() < nr_pages)
         return -ENOMEM;
 
     st = decrease_reservation(nr_pages, GFP_USER);
     if (st != BP_DONE)
         return -ENOMEM;
 
     return 0;
 }
 
 /**
  * xen_alloc_ballooned_pages - get pages that have been ballooned out
  * @nr_pages: Number of pages to get
  * @pages: pages returned
  * @return 0 on success, error otherwise
  */
 int xen_alloc_ballooned_pages(unsigned int nr_pages, struct page **pages)
 {
     unsigned int pgno = 0;
     struct page *page;
     int ret;
 
     mutex_lock(&balloon_mutex);
 
     balloon_stats.target_unpopulated += nr_pages;
 
     while (pgno < nr_pages) {
         page = balloon_retrieve(true);
         if (page) {
             pages[pgno++] = page;
 #ifdef CONFIG_XEN_HAVE_PVMMU
             /*
              * We don't support PV MMU when Linux and Xen is using
              * different page granularity.
              */
             BUILD_BUG_ON(XEN_PAGE_SIZE != PAGE_SIZE);
 
             if (!xen_feature(XENFEAT_auto_translated_physmap)) {
                 ret = xen_alloc_p2m_entry(page_to_pfn(page));
                 if (ret < 0)
                     goto out_undo;
             }
 #endif
         } else {
             ret = add_ballooned_pages(nr_pages - pgno);
             if (ret < 0)
                 goto out_undo;
         }
     }
     mutex_unlock(&balloon_mutex);
     return 0;
  out_undo:
     mutex_unlock(&balloon_mutex);
     xen_free_ballooned_pages(pgno, pages);
     /*
      * NB: xen_free_ballooned_pages will only subtract pgno pages, but since
      * target_unpopulated is incremented with nr_pages at the start we need
      * to remove the remaining ones also, or accounting will be screwed.
      */
     balloon_stats.target_unpopulated -= nr_pages - pgno;
     return ret;
 }
 EXPORT_SYMBOL(xen_alloc_ballooned_pages);
 
 /**
  * xen_free_ballooned_pages - return pages retrieved with get_ballooned_pages
  * @nr_pages: Number of pages
  * @pages: pages to return
  */
 void xen_free_ballooned_pages(unsigned int nr_pages, struct page **pages)
 {
     unsigned int i;
 
     mutex_lock(&balloon_mutex);
 
     for (i = 0; i < nr_pages; i++) {
         if (pages[i])
             balloon_append(pages[i]);
     }
 
     balloon_stats.target_unpopulated -= nr_pages;
 
     /* The balloon may be too large now. Shrink it if needed. */
     if (current_credit())
         wake_up(&balloon_thread_wq);
 
     mutex_unlock(&balloon_mutex);
 }
 EXPORT_SYMBOL(xen_free_ballooned_pages);
 
 static void __init balloon_add_regions(void)
 {
 #if defined(CONFIG_XEN_PV)
     unsigned long start_pfn, pages;
     unsigned long pfn, extra_pfn_end;
     unsigned int i;
 
     for (i = 0; i < XEN_EXTRA_MEM_MAX_REGIONS; i++) {
         pages = xen_extra_mem[i].n_pfns;
         if (!pages)
             continue;
 
         start_pfn = xen_extra_mem[i].start_pfn;
 
         /*
          * If the amount of usable memory has been limited (e.g., with
          * the 'mem' command line parameter), don't add pages beyond
          * this limit.
          */
         extra_pfn_end = min(max_pfn, start_pfn + pages);
 
         for (pfn = start_pfn; pfn < extra_pfn_end; pfn++)
             balloon_append(pfn_to_page(pfn));
 
         balloon_stats.total_pages += extra_pfn_end - start_pfn;
     }
 #endif
 }
 
 static int __init balloon_init(void)
 {
     struct task_struct *task;
 
     if (!xen_domain())
         return -ENODEV;
 
     pr_info("Initialising balloon driver\n");
 
 #ifdef CONFIG_XEN_PV
     balloon_stats.current_pages = xen_pv_domain()
         ? min(xen_start_info->nr_pages - xen_released_pages, max_pfn)
         : get_num_physpages();
 #else
     balloon_stats.current_pages = get_num_physpages();
 #endif
     balloon_stats.target_pages  = balloon_stats.current_pages;
     balloon_stats.balloon_low   = 0;
     balloon_stats.balloon_high  = 0;
     balloon_stats.total_pages   = balloon_stats.current_pages;
 
     balloon_stats.schedule_delay = 1;
     balloon_stats.max_schedule_delay = 32;
     balloon_stats.retry_count = 1;
     balloon_stats.max_retry_count = 4;
 
 #ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
     set_online_page_callback(&xen_online_page);
     register_memory_notifier(&xen_memory_nb);
     register_sysctl_table(xen_root);
 #endif
 
     balloon_add_regions();
 
     task = kthread_run(balloon_thread, NULL, "xen-balloon");
     if (IS_ERR(task)) {
         pr_err("xen-balloon thread could not be started, ballooning will not work!\n");
         return PTR_ERR(task);
     }
 
     /* Init the xen-balloon driver. */
     xen_balloon_init();
 
     return 0;
 }
 subsys_initcall(balloon_init);
 
 static int __init balloon_wait_finish(void)
 {
     long credit, last_credit = 0;
     unsigned long last_changed = 0;
 
     if (!xen_domain())
         return -ENODEV;
 
     /* PV guests don't need to wait. */
     if (xen_pv_domain() || !current_credit())
         return 0;
 
     pr_notice("Waiting for initial ballooning down having finished.\n");
 
     while ((credit = current_credit()) < 0) {
         if (credit != last_credit) {
             last_changed = jiffies;
             last_credit = credit;
         }
         if (balloon_state == BP_ECANCELED) {
             pr_warn_once("Initial ballooning failed, %ld pages need to be freed.\n",
                      -credit);
             if (time_is_before_eq_jiffies(last_changed + HZ * balloon_boot_timeout))
                 panic("Initial ballooning failed!\n");
         }
 
         schedule_timeout_interruptible(HZ / 10);
     }
 
     pr_notice("Initial ballooning down finished.\n");
 
     return 0;
 }
 late_initcall_sync(balloon_wait_finish);

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