On Sun, May 21, 2017 at 2:14 PM, Al Viro <v...@zeniv.linux.org.uk> wrote:
>
> Umm... get_user() for anything larger than long is simply not supported on
> a lot of architectures[1]. Do we really want to do that for
> unsafe_get_user()?
I'm pretty sure there's a reason we added support for it on x86-32,
because there are structures that use __u64 and fill things one entry
at a time.
It's entirely possible that that code then fails (maybe it compiles,
but doesn't work) on various other architectures. There's a lot of
drivers that are disabled on non-x86.
Linus
