Re: [PATCH v3 07/16] rust: add `Revocable` type

[Danilo Krummrich <dakr@kernel.org>]

On 10/29/24 2:26 PM, Alice Ryhl wrote:
> On Tue, Oct 22, 2024 at 11:33 PM Danilo Krummrich <dakr@kernel.org> wrote:
>> +/// A guard that allows access to a revocable object and keeps it alive.
>> +///
>> +/// CPUs may not sleep while holding on to [`RevocableGuard`] because it's in atomic context
>> +/// holding the RCU read-side lock.
>> +///
>> +/// # Invariants
>> +///
>> +/// The RCU read-side lock is held while the guard is alive.
>> +pub struct RevocableGuard<'a, T> {
>> +    data_ref: *const T,
>> +    _rcu_guard: rcu::Guard,
>> +    _p: PhantomData<&'a ()>,
>> +}
> 
> Is this needed? Can't all users just use `try_access_with_guard`?

Without this guard, how to we access `T` with just the `rcu::Guard`?

> 
> Alice
>