The patch titled
Subject: mm/page_alloc: add a VM_BUG in __free_one_page() if the zone is uninitialized.
has been added to the -mm tree. Its filename is
mm-page_alloc-add-a-vm_bug-in-__free_one_page-if-the-zone-is-uninitialized.patch
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------------------------------------------------------
From: Cody P Schafer <jmesmon@xxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxxxxx>
Cc: David Hansen <dave@xxxxxxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/page_alloc.c~mm-page_alloc-add-a-vm_bug-in-__free_one_page-if-the-zone-is-uninitialized mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-add-a-vm_bug-in-__free_one_page-if-the-zone-is-uninitialized
+++ a/mm/page_alloc.c
@@ -537,6 +537,8 @@ static inline void __free_one_page(struc
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;
_
Patches currently in -mm which might be from jmesmon@xxxxxxxxx are
mm-page_alloc-add-a-vm_bug-in-__free_one_page-if-the-zone-is-uninitialized.patch
mmzone-add-pgdat_end_pfnis_empty-helpers-consolidate.patch
mm-add-helper-ensure_zone_is_initialized.patch
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