From: Mel Gorman Date: Thu, 9 Oct 2014 22:28:28 +0000 (-0700) Subject: mm: page_alloc: Make paranoid check in move_freepages a VM_BUG_ON X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=97ee4ba7cbd30f1858f0d16911e042737c53f2ef;p=linux-beck.git mm: page_alloc: Make paranoid check in move_freepages a VM_BUG_ON Since 2.6.24 there has been a paranoid check in move_freepages that looks up the zone of two pages. This is a very slow path and the only time I've seen this bug trigger recently is when memory initialisation was broken during patch development. Despite the fact it's a slow path, this patch converts the check to a VM_BUG_ON anyway as it has served its purpose by now. Signed-off-by: Mel Gorman Acked-by: David Rientjes Acked-by: Rik van Riel Acked-by: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/page_alloc.c b/mm/page_alloc.c index f3769f0fce3c..eac31a6059c0 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1015,7 +1015,7 @@ int move_freepages(struct zone *zone, * Remove at a later date when no bug reports exist related to * grouping pages by mobility */ - BUG_ON(page_zone(start_page) != page_zone(end_page)); + VM_BUG_ON(page_zone(start_page) != page_zone(end_page)); #endif for (page = start_page; page <= end_page;) {