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Date: Wed, 28 Jul 2010 22:53:46 -0500
From: Alan Cox <alc@cs.rice.edu>
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To: Jeff Roberson <jeff@FreeBSD.org>
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Cc: svn-src-projects@freebsd.org, src-committers@freebsd.org
Subject: Re: svn commit: r210586 - projects/ofed/head/sys/ofed/include/linux
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Jeff Roberson wrote:
> Author: jeff
> Date: Thu Jul 29 02:12:22 2010
> New Revision: 210586
> URL: http://svn.freebsd.org/changeset/base/210586
>
> Log:
>    - Refine various page allocation methods.  They all essentially override
>      the page object pointer to cache the virtual address after allocation.
>      This same trick is used in UMA to store the slab address and so it
>      should be safe.
>   
>   

You needn't do this.  The virtual address of a kernel_object or 
kmem_object page is easily obtained:

    VM_MIN_KERNEL_ADDRESS + IDX_TO_OFF(m->pindex)


Regards,
Alan