On Fri, Nov 22, 2024 at 04:53:58PM +0100, Alice Ryhl wrote:
> On Fri, Nov 22, 2024 at 4:41 PM Alice Ryhl <aliceryhl@xxxxxxxxxx> wrote:
> >
> > Introduce a new type called `CurrentTask` that lets you perform various
> > operations that are only safe on the `current` task. Use the new type to
> > provide a way to access the current mm without incrementing its
> > refcount.
> >
> > With this change, you can write stuff such as
> >
> > let vma = current!().mm().lock_vma_under_rcu(addr);
> >
> > without incrementing any refcounts.
> >
> > Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
>
> Oh, that's awkward, I was testing this change using a config file that
> was missing CONFIG_RUST=y, so it didn't compile the code at all. You
> need the following imports for this to work:
>
> diff --git a/rust/kernel/task.rs b/rust/kernel/task.rs
> index 103d235eb844..60659076997a 100644
> --- a/rust/kernel/task.rs
> +++ b/rust/kernel/task.rs
> @@ -7,7 +7,8 @@
> use crate::{
> bindings,
> ffi::{c_int, c_long, c_uint},
> - types::{NotThreadSafe, Opaque},
> + mm::MmWithUser,
> + types::Opaque,
> };
> use core::{
> cmp::{Eq, PartialEq},
>
> Otherwise the code should be correct. You can fetch the tree with this fixed at:
> https://github.com/Darksonn/linux/commits/b4/vma/
>
> I'll fix it in the next version, but I will wait for review before I send that.
Sure, no problem, we can just make this a predicate for the ack.
>
> Alice
