Messages in this thread | | | Subject | Re: Bad page state with x86_64 | From | "Andreas Block" <> | Date | Wed, 27 Sep 2006 09:20:48 +0200 |
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On Tue, 26 Sep 2006 14:41:46 +0200, Nick Piggin <nickpiggin@yahoo.com.au> wrote:
> It is freeing a PageReserved page. You should ensure to balance your > reference counting on *each* page (or allocate a compound page and > treat it as a single one). When you map pages into userspace via > nopage or remap_pfn_range, you need to increment their count, which > gets decremented by the VM when they are unmapped.
Thanks a lot for your time and help. Still there are a few things a seemingly don't understand correctly. Do I understand you right, I don't have to "put_page" after calling "get_page" in my no-page handler? Also I'm wondering, why this code works flawlessly on 2.6.10 32-Bit and several 2.4.x kernels 32-Bit and PPC and is failing to work on x86_64, only. Do I have to do the "get/put_page" mechanism differnetly on x86_64? Another question: In my no-page handler, I reserve the physical page. I do have to clear the reserve bit of those page after unmap, right? Or is this done implicitly as well?
Again, thanks for your effort. -- -------------------------------------------------------------------------
_/_/_/_/ Andreas Block _/_/_/_/ Dipl.-Ing. _/_/_/_/ andreas.block@esd-electronics.com
_/_/_/ _/_/_/_/_/_/_/ esd electronic system design gmbh _/ _/ _/ _/ Vahrenwalder Str. 207 _/ _/ _/_/_/ _/ _/ D-30165 Hannover _/ _/ _/ _/ Phone: +49-511-37298-0 _/_/_/_/_/_/_/ _/_/_/ Fax: +49-511-37298-68 http://www.esd-electronics.com
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