Commit d29bb978 authored by Cody P Schafer's avatar Cody P Schafer Committed by Linus Torvalds

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: 's avatarCody 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: 's avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: 's avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 2a6e3ebe
......@@ -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;
......
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