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From: Andreas Hindborg <a.hindborg@kernel.org>
To: "Alice Ryhl" <aliceryhl@google.com>
Cc: "Miguel Ojeda" <ojeda@kernel.org>,  "Matthew Wilcox"
 <willy@infradead.org>,  "Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
  "Vlastimil Babka" <vbabka@suse.cz>,  "John Hubbard"
 <jhubbard@nvidia.com>,  "Liam R. Howlett" <Liam.Howlett@oracle.com>,
  "Andrew Morton" <akpm@linux-foundation.org>,  "Greg Kroah-Hartman"
 <gregkh@linuxfoundation.org>,  "Arnd Bergmann" <arnd@arndb.de>,
  "Christian Brauner" <brauner@kernel.org>,  "Jann Horn"
 <jannh@google.com>,  "Suren Baghdasaryan" <surenb@google.com>,  "Alex
 Gaynor" <alex.gaynor@gmail.com>,  "Boqun Feng" <boqun.feng@gmail.com>,
  "Gary Guo" <gary@garyguo.net>,  =?utf-8?Q?Bj=C3=B6rn?= Roy Baron
 <bjorn3_gh@protonmail.com>,  "Benno Lossin" <benno.lossin@proton.me>,
  "Trevor Gross" <tmgross@umich.edu>,  <linux-kernel@vger.kernel.org>,
  <linux-mm@kvack.org>,  <rust-for-linux@vger.kernel.org>
Subject: Re: [PATCH v11 5/8] mm: rust: add mmput_async support
In-Reply-To: <20241211-vma-v11-5-466640428fc3@google.com> (Alice Ryhl's
	message of "Wed, 11 Dec 2024 10:37:09 +0000")
References: <20241211-vma-v11-0-466640428fc3@google.com>
	<HlSjKVLowJx8jJu4bSrIYUhfDdz2BNKq_aDlV2KVN3qUCtQAThvoI1yygvnEMZwKWnT1yrJ2V2YTwcG6aQO-uA==@protonmail.internalid>
	<20241211-vma-v11-5-466640428fc3@google.com>
Date: Mon, 16 Dec 2024 14:10:47 +0100
Message-ID: <87seqnai3s.fsf@kernel.org>
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"Alice Ryhl" <aliceryhl@google.com> writes:

> Adds an MmWithUserAsync type that uses mmput_async when dropped but is
> otherwise identical to MmWithUser. This has to be done using a separate
> type because the thing we are changing is the destructor.
>
> Rust Binder needs this to avoid a certain deadlock. See commit
> 9a9ab0d96362 ("binder: fix race between mmput() and do_exit()") for
> details. It's also needed in the shrinker to avoid cleaning up the mm in
> the shrinker's context.
>
> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> (for mm bits)
> Signed-off-by: Alice Ryhl <aliceryhl@google.com>


Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>


Best regards,
Andreas Hindborg