linux-kernel - Re: [PATCH v6] rust: add global lock support

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Message-ID: <CAH5fLgg6xO71ud3mHvEaKhU1tYKf7RKTrVcL1brHoORf9nSgoQ@mail.gmail.com>
Date: Tue, 29 Oct 2024 15:17:36 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Peter Zijlstra <peterz@...radead.org>, 
	Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, Waiman Long <longman@...hat.com>, 
	Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Andreas Hindborg <a.hindborg@...nel.org>
Subject: Re: [PATCH v6] rust: add global lock support

On Mon, Oct 28, 2024 at 6:49 PM Boqun Feng <boqun.feng@...il.com> wrote:
>
> On Wed, Oct 23, 2024 at 01:23:18PM +0000, Alice Ryhl wrote:
> > Add support for creating global variables that are wrapped in a mutex or
> > spinlock.
> >
> > The implementation here is intended to replace the global mutex
> > workaround found in the Rust Binder RFC [1]. In both cases, the global
> > lock must be initialized before first use. The macro is unsafe to use
> > for the same reason.
> >
> > The separate initialization step is required because it is tricky to
> > access the value of __ARCH_SPIN_LOCK_UNLOCKED from Rust. Doing so will
> > require changes to the C side. That change will happen as a follow-up to
> > this patch.
> >
> > Link: https://lore.kernel.org/rust-for-linux/20231101-rust-binder-v1-2-08ba9197f637@google.com/#Z31drivers:android:context.rs [1]
> > Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
>
> Reviewed-by: Boqun Feng <boqun.feng@...il.com>

Thanks!

Alice