[patch resend] mm: introduce a common interface for balloon pagesmobility fix

[David Rientjes]

Fixes build failure from "mm: introduce a common interface for balloon 
pages mobility":

mm/balloon_compaction.c: In function 'balloon_page_putback':
mm/balloon_compaction.c:243: error: implicit declaration of function '__WARN'

Generic code calls WARN_ON(), not __WARN() directly.

Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>
---
 Still affects linux-next, original patch posted November 9.

 mm/balloon_compaction.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -240,7 +240,7 @@ void balloon_page_putback(struct page *page)
 		put_page(page);
 		balloon_event_count(COMPACTBALLOONRETURNED);
 	} else {
-		__WARN();
+		WARN_ON(1);
 		dump_page(page);
 	}
 	unlock_page(page);
--
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