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Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping

From Dave Hansen <dave.hansen@intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping
Date 2015-12-02 23:10 +0100
Message-ID <qBnL4-4Iv-11@gated-at.bofh.it> (permalink)
References (11 earlier) <qBlJg-3cy-5@gated-at.bofh.it> <qBmvE-3Jz-25@gated-at.bofh.it> <qBmFl-3Od-35@gated-at.bofh.it> <qBnL3-4Iv-1@gated-at.bofh.it> <qBnL4-4Iv-13@gated-at.bofh.it>
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On 12/02/2015 02:03 PM, Dan Williams wrote:
>>> >> Is pfn_valid() a reliable check?  It seems to be based on a max_pfn
>>> >> per node... what happens when pmem is located below that point.  I
>>> >> haven't been able to convince myself that we won't get false
>>> >> positives, but maybe I'm missing something.
>> >
>> > With sparsemem at least, it makes sure that you're looking at a valid
>> > _section_.  See the pfn_valid() at ~include/linux/mmzone.h:1222.
> At a minimum we would need to add "depends on SPARSEMEM" to "config FS_DAX_PMD".

Yeah, it seems like an awful layering violation.  But, sparsemem is
turned on everywhere (all the distros/users) that we care about, as far
as I know.
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Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-11-30 23:10 +0100
  Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 02:30 +0100
    Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 04:50 +0100
      Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 17:50 +0100
        Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 18:40 +0100
          Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 19:10 +0100
            Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 19:40 +0100
              Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 20:10 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 20:20 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 21:00 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 21:50 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 22:00 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-02 22:10 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-04 00:50 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-04 17:10 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dave Hansen <dave.hansen@intel.com> - 2015-12-02 23:10 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dave Hansen <dave.hansen@intel.com> - 2015-12-02 23:10 +0100
                Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 23:10 +0100
              Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-02 20:10 +0100
        Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Toshi Kani <toshi.kani@hpe.com> - 2015-12-03 00:30 +0100
          Re: [PATCH] mm: Fix mmap MAP_POPULATE for DAX pmd mapping Dan Williams <dan.j.williams@intel.com> - 2015-12-03 00:40 +0100

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