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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>
This commit is contained in:
Cody P Schafer 2013-02-22 16:35:25 -08:00 committed by Linus Torvalds
parent 2a6e3ebee2
commit d29bb9782d
1 changed files with 2 additions and 0 deletions
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2
mm/page_alloc.c
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@ -538,6 +538,8 @@ static inline void __free_one_page(struct page *page,
unsigned long uninitialized_var(buddy_idx); unsigned long uninitialized_var(buddy_idx);
struct page *buddy; struct page *buddy;
VM_BUG_ON(!zone_is_initialized(zone));
if (unlikely(PageCompound(page))) if (unlikely(PageCompound(page)))
if (unlikely(destroy_compound_page(page, order))) if (unlikely(destroy_compound_page(page, order)))
return; return;