On Tue, Sep 6, 2016 at 10:20 AM, Matthew Wilcox <[email protected]> wrote: > I have no objection to this patch going in for now. > > Longer term, surely we want to track what mode the PFNs are mapped in? There > are various bizarre suppositions out there about how persistent memory should > be mapped, and it's probably better if the kernel ignores what the user > specifies and keeps everything sane. I've read the dire warnings in the > Intel architecture manual and I have no desire to deal with the inevitable > bug reports on some hardware I don't own and requires twenty weeks of > operation in order to observe the bug.
Is there a way for userspace to establish mappings with different cache modes, besides via /dev/mem? That was the motivation for CONFIG_IO_STRICT_DEVMEM.
