linux-kernel - [PATCH 03/17] mm/page_alloc: add a VM_BUG in __free_one

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Date:	Tue, 15 Jan 2013 16:24:40 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Linux MM <linux-mm@...ck.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Cody P Schafer <jmesmon@...il.com>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>
Subject: [PATCH 03/17] mm/page_alloc: add a VM_BUG in __free_one_page() if the zone is uninitialized.

From: Cody P Schafer <jmesmon@...il.com>

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@...ux.vnet.ibm.com>
---
 mm/page_alloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index df2022f..da5a5ec 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -532,6 +532,8 @@ 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;
-- 
1.8.0.3

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