On Tue, 3 Oct 2017, Christoph Hellwig wrote:

On Tue, Oct 03, 2017 at 11:30:50AM -0400, Nicolas Pitre wrote:

quoted

Unless you have a better scheme altogether  to suggest of course, given 
the existing constraints.

I still can't understand why this convoluted fault path that finds
vma, attempts with all kinds of races and then tries to update things
like vm_ops is even nessecary.

We have direct mappings of physical address perfectly working in the
DAX code (even with write support!) or in drivers using remap_pfn_range
so a really good explanation why neither scheme can be used is needed
first.

I provided that explanation several times by now in my cover letter. And 
separately even to you directly at least once.  What else should I do?


Nicolas

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