/* SPDX-License-Identifier: GPL-2.0 */
  #ifndef _MM_PAGE_REPORTING_H
  #define _MM_PAGE_REPORTING_H
  
  #include <linux/mmzone.h>
  #include <linux/pageblock-flags.h>
  #include <linux/page-isolation.h>
  #include <linux/jump_label.h>
  #include <linux/slab.h>
  #include <linux/pgtable.h>
  #include <linux/scatterlist.h>
  
  #define PAGE_REPORTING_MIN_ORDER	pageblock_order
  
  #ifdef CONFIG_PAGE_REPORTING
  DECLARE_STATIC_KEY_FALSE(page_reporting_enabled);
  void __page_reporting_notify(void);
  
  static inline bool page_reported(struct page *page)
  {
  	return static_branch_unlikely(&page_reporting_enabled) &&
  	       PageReported(page);
  }
  
  /**
   * page_reporting_notify_free - Free page notification to start page processing
   *
   * This function is meant to act as a screener for __page_reporting_notify
   * which will determine if a give zone has crossed over the high-water mark
   * that will justify us beginning page treatment. If we have crossed that
   * threshold then it will start the process of pulling some pages and
   * placing them in the batch list for treatment.
   */
  static inline void page_reporting_notify_free(unsigned int order)
  {
  	/* Called from hot path in __free_one_page() */
  	if (!static_branch_unlikely(&page_reporting_enabled))
  		return;
  
  	/* Determine if we have crossed reporting threshold */
  	if (order < PAGE_REPORTING_MIN_ORDER)
  		return;
  
  	/* This will add a few cycles, but should be called infrequently */
  	__page_reporting_notify();
  }
  #else /* CONFIG_PAGE_REPORTING */
  #define page_reported(_page)	false
  
  static inline void page_reporting_notify_free(unsigned int order)
  {
  }
  #endif /* CONFIG_PAGE_REPORTING */
  #endif /*_MM_PAGE_REPORTING_H */