linux-kernel - Re: [RFCv3][PATCH 1/3] create slow_virt_to

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Message-ID: <50F58C31.3020105@redhat.com>
Date:	Tue, 15 Jan 2013 12:04:49 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Gleb Natapov <gleb@...hat.com>, Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [RFCv3][PATCH 1/3] create slow_virt_to_phys()

On 01/09/2013 01:59 PM, Dave Hansen wrote:
> Broadening the cc list here a bit...  This bug is still present,
> and I still need these patches to boot 32-bit NUMA kernels.  They
> might be obscure, but if we don't care about them any more, perhaps
> we should go remove the NUMA remapping code instead of this.
>
> --
>
> This is necessary because __pa() does not work on some kinds of
> memory, like vmalloc() or the alloc_remap() areas on 32-bit
> NUMA systems.  We have some functions to do conversions _like_
> this in the vmalloc() code (like vmalloc_to_page()), but they
> do not work on sizes other than 4k pages.  We would potentially
> need to be able to handle all the page sizes that we use for
> the kernel linear mapping (4k, 2M, 1G).

Acked-by: Rik van Riel <riel@...hat.com>


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