On Tue, 3 Oct 2017, Christoph Hellwig wrote: > 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 > 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
