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Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation

From Christoph Hellwig <hch@lst.de>
Newsgroups linux.kernel
Subject Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation
Date 2015-08-15 18:10 +0200
Message-ID <pXMbU-6p2-9@gated-at.bofh.it> (permalink)
References <pX41c-Hx-11@gated-at.bofh.it> <pX41c-Hx-29@gated-at.bofh.it> <pXFWN-5CP-11@gated-at.bofh.it> <pXLSy-5ML-25@gated-at.bofh.it>
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On Sat, Aug 15, 2015 at 08:44:27AM -0700, Dan Williams wrote:
> That said, while we don't need special accessors we do need guarantees
> that anything that has written to a persistent memory address has done
> so in a way that wmb_pmem() is able to flush it.  It's more of a "I've
> audited this code path for wmb_pmem() compatibility so use this api to
> write to pmem."

I'm more worried about things where don't just do plain loads and stores
to a pmem region but DMA, which will end up as a nightmare of casts.

But we can wait and see how that evolves in the end..
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[PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-08-13 19:00 +0200
  Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation Dan Williams <dan.j.williams@intel.com> - 2015-08-13 23:30 +0200
    Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem  annotation Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-08-14 19:00 +0200
      Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation Dan Williams <dan.j.williams@intel.com> - 2015-08-14 19:00 +0200
        Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem  annotation Christoph Hellwig <hch@lst.de> - 2015-08-15 11:20 +0200
          Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation Dan Williams <dan.j.williams@intel.com> - 2015-08-15 17:50 +0200
  Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem  annotation Christoph Hellwig <hch@lst.de> - 2015-08-15 11:30 +0200
    Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation Dan Williams <dan.j.williams@intel.com> - 2015-08-15 17:50 +0200
      Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem  annotation Christoph Hellwig <hch@lst.de> - 2015-08-15 18:10 +0200
        Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem annotation Dan Williams <dan.j.williams@intel.com> - 2015-08-15 20:10 +0200
      Re: [PATCH v2 7/7] pmem, dax: have direct_access use __pmem  annotation Ross Zwisler <ross.zwisler@linux.intel.com> - 2015-08-17 22:10 +0200

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