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Re: [PATCH] dax: Split pmd map when fallback on COW

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On Mon, 2015-11-23 at 13:05 -0700, Toshi Kani wrote:
> An infinite loop of PMD faults was observed when attempted to
> mlock() a private read-only PMD mmap'd range of a DAX file.

Typo: the above description should be (remove "read-only"): 

An infinite loop of PMD faults was observed when attempted to mlock() a private
PMD mmap'd range of a DAX file.

-Toshi

> __dax_pmd_fault() simply returns with VM_FAULT_FALLBACK when
> falling back to PTE on COW.  However, __handle_mm_fault()
> returns without falling back to handle_pte_fault() because
> a PMD map is present in this case.
> 
> Change __dax_pmd_fault() to split the PMD map, if present,
> before returning with VM_FAULT_FALLBACK.

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[PATCH] dax: Split pmd map when fallback on COW Toshi Kani <toshi.kani@hpe.com> - 2015-11-23 21:20 +0100
  Re: [PATCH] dax: Split pmd map when fallback on COW Dan Williams <dan.j.williams@intel.com> - 2015-11-23 21:50 +0100
    Re: [PATCH] dax: Split pmd map when fallback on COW Toshi Kani <toshi.kani@hpe.com> - 2015-11-23 22:00 +0100
      Re: [PATCH] dax: Split pmd map when fallback on COW Dan Williams <dan.j.williams@intel.com> - 2015-11-23 22:00 +0100
        Re: [PATCH] dax: Split pmd map when fallback on COW Toshi Kani <toshi.kani@hpe.com> - 2015-11-23 22:10 +0100
  Re: [PATCH] dax: Split pmd map when fallback on COW Toshi Kani <toshi.kani@hpe.com> - 2015-11-24 00:10 +0100
  Re: [PATCH] dax: Split pmd map when fallback on COW Dan Williams <dan.j.williams@intel.com> - 2015-11-24 18:10 +0100

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