Re: [PATCH 1/3] Revert "dax: fix NULL pointer in __dax_pmd_fault()"

[Dan Williams]

On Fri, Oct 2, 2015 at 2:02 PM, Ross Zwisler
<ross.zwisler@xxxxxxxxxxxxxxx> wrote:
> This reverts commit 8346c416d17bf5b4ea1508662959bb62e73fd6a5.
>
> This commit did fix the issue it intended to fix, but it turns out that
> the locking changes introduced by these two commits:
>
> commit 843172978bb9 ("dax: fix race between simultaneous faults")
> commit 46c043ede471 ("mm: take i_mmap_lock in unmap_mapping_range() for DAX")
>
> had other issues as well, so they need to just be reverted.

Wait, why introduce two points in the kernel history where we have a
known uninitialized variable?  I'd say fix up the revert of "mm: take
i_mmap_lock in unmap_mapping_range() for DAX" to address the conflict
with the fix, one less patch and keeps the stability rolling forward.
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