linux-kernel - [PATCH] Fix new alloc_bootmem_core (Re: [PATCH -mm 08/14] bootmem: clean up alloc_bootmem

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Message-Id: <20080617173021.C1FE.E1E9C6FF@jp.fujitsu.com>
Date:	Tue, 17 Jun 2008 18:34:09 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Johannes Weiner <hannes@...urebad.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] Fix new alloc_bootmem_core (Re: [PATCH -mm 08/14] bootmem: clean up alloc_bootmem_core)

Hi Johannes-san.

I found a bug in this patch.


> -	eidx = end_pfn - PFN_DOWN(node_boot_start);
> +	if (goal && goal < max)
> +		start = ALIGN(goal, step);
> +	else
> +		start = ALIGN(min, step);

Here should check (min < goal) too.

If not, start can becomes smaller than min. and sidx doesn't point
correct index.
alloc_bootmem_node() almost allocates pages of other node,
when node's min address is over MAX_DMA_ADDRESS.

Bye.

----

Fix new alloc_bootmem_core() of bootmem-clean-up-alloc_bootmem_core.patch
in 2.6.26-rc5-mm3.

(min < goal) should be checked too.


Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com>
CC: Johannes Weiner <hannes@...urebad.de>

---
 mm/bootmem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: current/mm/bootmem.c
===================================================================
--- current.orig/mm/bootmem.c	2008-06-17 18:33:31.000000000 +0900
+++ current/mm/bootmem.c	2008-06-17 18:34:27.000000000 +0900
@@ -435,7 +435,7 @@
 
 	step = max(align >> PAGE_SHIFT, 1UL);
 
-	if (goal && goal < max)
+	if (goal && min < goal && goal < max)
 		start = ALIGN(goal, step);
 	else
 		start = ALIGN(min, step);



-- 
Yasunori Goto 


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