Re: [PATCH] vmalloc: introduce vmap_pfn for persistent memory

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Subject: Re: [PATCH] vmalloc: introduce vmap_pfn for persistent memory
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 8 Nov 2017 07:35:22 -0800
Cc: linux-nvdimm@xxxxxxxxxxxx, Dan Williams <dan.j.williams@xxxxxxxxx>, Christoph Hellwig <hch@xxxxxxxxxxxxx>, linux-mm@xxxxxxxxx, dm-devel@xxxxxxxxxx, Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>, Laura Abbott <labbott@xxxxxxxxxx>, Christoph Hellwig <hch@xxxxxx>, "Kirill A . Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
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On Wed, Nov 08, 2017 at 10:21:38AM -0500, Mikulas Patocka wrote:
> > And what do you do for an architecture with virtuall indexed caches?
> 
> Persistent memory is not supported on such architectures - it is only 
> supported on x86-64 and arm64.

For now.  But once support is added your driver will just corrupt data
unless you have the right API in place.

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  - From: Mikulas Patocka
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