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Re: [PATCH 4/5] mm: fix cache mode of dax pmd mappings

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On Tue, Sep 6, 2016 at 10:20 AM, Matthew Wilcox <mawilcox@microsoft.com> wrote:
> I have no objection to this patch going in for now.
>
> Longer term, surely we want to track what mode the PFNs are mapped in?  There are various bizarre suppositions out there about how persistent memory should be mapped, and it's probably better if the kernel ignores what the user specifies and keeps everything sane.  I've read the dire warnings in the Intel architecture manual and I have no desire to deal with the inevitable bug reports on some hardware I don't own and requires twenty weeks of operation in order to observe the bug.

Is there a way for userspace to establish mappings with different
cache modes, besides via /dev/mem?  That was the motivation for
CONFIG_IO_STRICT_DEVMEM.

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[PATCH 4/5] mm: fix cache mode of dax pmd mappings Dan Williams <dan.j.williams@intel.com> - 2016-09-06 19:00 +0200
  Re: [PATCH 4/5] mm: fix cache mode of dax pmd mappings Dan Williams <dan.j.williams@intel.com> - 2016-09-06 19:40 +0200
  RE: [PATCH 4/5] mm: fix cache mode of dax pmd mappings Matthew Wilcox <mawilcox@microsoft.com> - 2016-09-06 20:00 +0200
  Re: [PATCH 4/5] mm: fix cache mode of dax pmd mappings Andrew Morton <akpm@linux-foundation.org> - 2016-09-06 22:20 +0200
    Re: [PATCH 4/5] mm: fix cache mode of dax pmd mappings Dan Williams <dan.j.williams@intel.com> - 2016-09-07 00:00 +0200
      Re: [PATCH 4/5] mm: fix cache mode of dax pmd mappings "Kani, Toshimitsu" <toshi.kani@hpe.com> - 2016-09-07 21:40 +0200
        Re: [PATCH 4/5] mm: fix cache mode of dax pmd mappings Dan Williams <dan.j.williams@intel.com> - 2016-09-07 21:50 +0200

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