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SubjectRe: [PATCH v4 4/5] cramfs: add mmap support
On Tue, Oct 03, 2017 at 11:30:50AM -0400, Nicolas Pitre wrote:
> 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

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