From d29bb9782d22063892e28716cdb76a87d2876ddb Mon Sep 17 00:00:00 2001 From: Cody P Schafer <cody@linux.vnet.ibm.com> Date: Fri, 22 Feb 2013 16:35:25 -0800 Subject: [PATCH] mm/page_alloc: add a VM_BUG in __free_one_page() if the zone is uninitialized. Freeing pages to uninitialized zones is not handled by __free_one_page(), and should never happen when the code is correct. Ran into this while writing some code that dynamically onlines extra zones. Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com> Cc: David Hansen <dave@linux.vnet.ibm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> --- mm/page_alloc.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a3687afc5917..9614aabee8c5 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -538,6 +538,8 @@ static inline void __free_one_page(struct page *page, unsigned long uninitialized_var(buddy_idx); struct page *buddy; + VM_BUG_ON(!zone_is_initialized(zone)); + if (unlikely(PageCompound(page))) if (unlikely(destroy_compound_page(page, order))) return;