linux-kernel - Re: [PATCH v6 3/6] rust: irq: add support for non-threaded IRQs and handlers

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Message-Id: <C72C6915-3BB2-431F-89ED-7743D8A62B7E@collabora.com>
Date: Mon, 14 Jul 2025 12:12:37 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: Benno Lossin <lossin@...nel.org>,
 Miguel Ojeda <ojeda@...nel.org>,
 Alex Gaynor <alex.gaynor@...il.com>,
 Boqun Feng <boqun.feng@...il.com>,
 Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Andreas Hindborg <a.hindborg@...nel.org>,
 Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>,
 Thomas Gleixner <tglx@...utronix.de>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org,
 linux-pci@...r.kernel.org
Subject: Re: [PATCH v6 3/6] rust: irq: add support for non-threaded IRQs and
 handlers

Hi,

> 
>>> 
>>>  (2) It is guaranteed that the device pointer is valid because (1) guarantees
>>>      it's even bound and because Devres<RegistrationInner> itself has a
>>>      reference count.
>> 
>> Yeah but I would find it much more natural (and also useful in other
>> circumstances) if `Devres<T>` would give you access to `Device` (at
>> least the `Normal` type state).
> 
> If we use container_of!() instead or just pass the address of Self (i.e.
> Registration) to request_irq() instead,

Boqun, Benno, are you ok with passing the address of Registration<T> as the cookie?

Recall that this was a change requested in v4, so I am checking whether we are
all on the same page before going back to that.

See [0], i.e.:

> > > >> Well yes and no, with the Devres changes, the `cookie` can just be the
> > > >> address of the `RegistrationInner` & we can do it this way :)
> > > >>
> > > >> ---
> > > >> Cheers,
> > > >> Benno
> > > >
> > > >
> > > > No, we need this to be the address of the the whole thing (i.e.
> > > > Registration<T>), otherwise you can’t access the handler in the irq
> > > > callback.
> 
> You only need the access of `handler` in the irq callback, right? I.e.
> passing the address of `handler` would suffice (of course you need
> to change the irq callback as well).

— Daniel

[0] https://lore.kernel.org/all/aFq3P_4XgP0dUrAS@Mac.home/