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Commit 018e9a49 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
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mm/compaction.c: fix "suitable_migration_target() unused" warning 



mm/compaction.c:250:13: warning: 'suitable_migration_target' defined but not used [-Wunused-function]

Reported-by: default avatarFengguang Wu <fengguang.wu@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent be64f884

mm/compaction.c

+23 −22
Original line number Diff line number Diff line
@@ -391,28 +391,6 @@ static inline bool compact_should_abort(struct compact_control *cc) 
	return false;

}



/* Returns true if the page is within a block suitable for migration to */

static bool suitable_migration_target(struct page *page)

{

	/* If the page is a large free page, then disallow migration */

	if (PageBuddy(page)) {

		/*

		 * We are checking page_order without zone->lock taken. But

		 * the only small danger is that we skip a potentially suitable

		 * pageblock, so it's not worth to check order for valid range.

		 */

		if (page_order_unsafe(page) >= pageblock_order)

			return false;

	}



	/* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */

	if (migrate_async_suitable(get_pageblock_migratetype(page)))

		return true;



	/* Otherwise skip the block */

	return false;

}



/*

 * Isolate free pages onto a private freelist. If @strict is true, will abort

 * returning 0 on any invalid PFNs or non-free pages inside of the pageblock
@@ -896,6 +874,29 @@ isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn, 


#endif /* CONFIG_COMPACTION || CONFIG_CMA */

#ifdef CONFIG_COMPACTION



/* Returns true if the page is within a block suitable for migration to */

static bool suitable_migration_target(struct page *page)

{

	/* If the page is a large free page, then disallow migration */

	if (PageBuddy(page)) {

		/*

		 * We are checking page_order without zone->lock taken. But

		 * the only small danger is that we skip a potentially suitable

		 * pageblock, so it's not worth to check order for valid range.

		 */

		if (page_order_unsafe(page) >= pageblock_order)

			return false;

	}



	/* If the block is MIGRATE_MOVABLE or MIGRATE_CMA, allow migration */

	if (migrate_async_suitable(get_pageblock_migratetype(page)))

		return true;



	/* Otherwise skip the block */

	return false;

}



/*

 * Based on information in the current compact_control, find blocks

 * suitable for isolating free pages from and then isolate them.