> > I think so. The filemap_xip.c functionality doesn't work for Flash
> > memory yet. Flash memory doesn't have struct pages to back it up with
> > which this stuff depends on.
>
> Struct page is not the major issue. The primary problem is writing to
> the media (and I am not a flash expert at all, just relaying here):
> For some period of time, the flash memory is not usable and thus we
> need to make sure we can nuke the page table entries that we have in
> userland page tables. For that, we need a callback from the device so
> that it can ask to get its references back. Oh, and a put_xip_page
> counterpart to get_xip_page, so that the driver knows when it's safe
> to erase.
Well... That's the biggest/hardest problem, yes. But not the first.
First we got to tackle the easy read only case, which doesn't require
any of that unpleasantness, yet which is used in a bunch of out of
tree hacks.
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