Linus Torvalds <torvalds@linux-foundation.org> writes:

quoted text
>
> So I'm starting to think the bug is all in there, not in the VM itself. 
> See arch/x86/lib/copy_user_nocache.S.

The x86-64 copy_*_user functions were always designed to return errors
both ways (as in both for load and for store). That's needed because
the loops are shared for copy_to_user and copy_from_user. That's normally
ok because when you do _to_user you shouldn't fault on the loads
and vice versa. If a caller does that it's buggy.

-Andi
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