The suggestion was to do lazy mmap, ie you map at an
address that was going to fault anyway, don't alter the
TLB, 'just' make copy_from_user recognise what's going on.
It doesn't have to work from user space since the mmap
is never touched from user space anyway.
> mmap() _really_ really isn't the solution to zero-copy.
You are probably right, but...
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