linux-kernel - Re: [PATCH] Fix kunmap() argument in sg_miter

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Date:	Mon, 17 Nov 2008 09:15:42 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Tejun Heo <htejun@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Hugh Dickins <hugh@...itas.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] Fix kunmap() argument in sg_miter_stop

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> Jens Axboe wrote:
>>     
>>> One exception is a real bug that this turned up. The XEN balloon driver
>>> passes the virt address into kunmap() as well, so that part should go in
>>> for 2.6.28. I've CC'ed Jeremy.
>>>   
>>>       
>> Oops.  Acked-by: Jeremy Fitzhardinge  <jeremy.fitzhardinge@...rix.com>
>>     
>
> Could you please send a changelogged fix for x86/urgent, to make sure 
> this shows up in .28?
>   

Subject: xen/balloon: kunmap takes a page *

Pass the struct page * to kunmap, not the vaddr of the mapping itself.

Pointed out by Jens Axboe <jens.axboe@...cle.com>

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 drivers/xen/balloon.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

===================================================================
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -120,7 +120,7 @@
 	if (PageHighMem(page)) {
 		void *v = kmap(page);
 		clear_page(v);
-		kunmap(v);
+		kunmap(page);
 	} else {
 		void *v = page_address(page);
 		clear_page(v);



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