Rust support

Rust support

This is a draft for linux-next. This message is intentionally bare-bones
for the moment. It is not representative of the final contents and will
be rebased.

In particular, trees in linux-next are typically required to meet a set
of requirements which at the moment this tree does *not*. This tree has
a special waiver for some days in order to prepare an RFC for the LKML
that will be submitted soon to have a wider discussion on these changes.

Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: Geoffrey Thomas <geofft@ldpreload.com>
Signed-off-by: Geoffrey Thomas <geofft@ldpreload.com>
Co-developed-by: Finn Behrens <me@kloenk.de>
Signed-off-by: Finn Behrens <me@kloenk.de>
Co-developed-by: Wedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: Wedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Signed-off-by: Adam Bratschi-Kaye <ark.email@gmail.com>
Co-developed-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>