include/linux/page-isolation.h

#ifndef __LINUX_PAGEISOLATION_H
#define __LINUX_PAGEISOLATION_H

/*
 * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE.
 * If specified range includes migrate types other than MOVABLE or CMA,
 * this will fail with -EBUSY.
 *
 * For isolating all pages in the range finally, the caller have to
 * free all pages in the range. test_page_isolated() can be used for
 * test it.
 */
extern int
start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
			 unsigned migratetype);

/*
 * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE.
 * target range is [start_pfn, end_pfn)
 */
extern int
undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
			unsigned migratetype);

/*
 * Test all pages in [start_pfn, end_pfn) are isolated or not.
 */
int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn);

/*
 * Internal functions. Changes pageblock's migrate type.
 */
int set_migratetype_isolate(struct page *page);
void unset_migratetype_isolate(struct page *page, unsigned migratetype);

/* The below functions must be run on a range from a single zone. */
int alloc_contig_range(unsigned long start, unsigned long end,
		       unsigned migratetype);
void free_contig_range(unsigned long pfn, unsigned nr_pages);

/* CMA stuff */
extern void init_cma_reserved_pageblock(struct page *page);

#endif