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Re: [PATCH 29/31] parisc: handle page-less SG entries

From Christoph Hellwig <hch@lst.de>
Newsgroups linux.kernel
Subject Re: [PATCH 29/31] parisc: handle page-less SG entries
Date 2015-08-13 16:40 +0200
Message-ID <pX1PI-652-23@gated-at.bofh.it> (permalink)
References <pWykF-5Aj-9@gated-at.bofh.it> <pWyum-5LM-23@gated-at.bofh.it> <pWGLf-Uh-1@gated-at.bofh.it>
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On Wed, Aug 12, 2015 at 09:01:02AM -0700, Linus Torvalds wrote:
> I'm assuming that anybody who wants to use the page-less
> scatter-gather lists always does so on memory that isn't actually
> virtually mapped at all, or only does so on sane architectures that
> are cache coherent at a physical level, but I'd like that assumption
> *documented* somewhere.

It's temporarily mapped by kmap-like helpers.  That code isn't in
this series. The most recent version of it is here:

https://git.kernel.org/cgit/linux/kernel/git/djbw/nvdimm.git/commit/?h=pfn&id=de8237c99fdb4352be2193f3a7610e902b9bb2f0

note that it's not doing the cache flushing it would have to do yet, but
it's also only enabled for x86 at the moment.
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Thread

[PATCH 29/31] parisc: handle page-less SG entries Christoph Hellwig <hch@lst.de> - 2015-08-12 09:20 +0200
  Re: [PATCH 29/31] parisc: handle page-less SG entries Linus Torvalds <torvalds@linux-foundation.org> - 2015-08-12 18:10 +0200
    Re: [PATCH 29/31] parisc: handle page-less SG entries Christoph Hellwig <hch@lst.de> - 2015-08-13 16:40 +0200
      Re: [PATCH 29/31] parisc: handle page-less SG entries Dan Williams <dan.j.williams@intel.com> - 2015-08-14 05:40 +0200
        Re: [PATCH 29/31] parisc: handle page-less SG entries James Bottomley <James.Bottomley@HansenPartnership.com> - 2015-08-14 06:00 +0200
          Re: [PATCH 29/31] parisc: handle page-less SG entries David Miller <davem@davemloft.net> - 2015-08-14 06:20 +0200
            Re: [PATCH 29/31] parisc: handle page-less SG entries Dan Williams <dan.j.williams@intel.com> - 2015-08-14 18:20 +0200

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