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([187.120.154.251]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-21de4a9cfcdsm15396945ad.20.2025.01.30.10.52.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Jan 2025 10:52:06 -0800 (PST) From: Guilherme Giacomo Simoes To: peterz@infradead.org, mingo@redhat.com, will@kernel.org, boqun.feng@gmail.com, longman@redhat.com, ojeda@kernel.org, alex.gaynor@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu Cc: Guilherme Giacomo Simoes , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: [PATCH] rust: sync: create the `get_mut()` function Date: Thu, 30 Jan 2025 15:51:38 -0300 Message-Id: <20250130185138.200993-1-trintaeoitogc@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Create a `get_mut()` function that receive a mutable instance of Lock, and return a mutable reference to data because if the instance is mutable, the rust compiler guarantee the access control. Suggested-by: Björn Roy Baron Signed-off-by: Guilherme Giacomo Simoes --- rust/kernel/sync/lock.rs | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/rust/kernel/sync/lock.rs b/rust/kernel/sync/lock.rs index eb80048e0110..3f9d78bcb37c 100644 --- a/rust/kernel/sync/lock.rs +++ b/rust/kernel/sync/lock.rs @@ -140,6 +140,12 @@ pub fn new(t: T, name: &'static CStr, key: &'static LockClassKey) -> impl PinIni }), }) } + + /// Get a mutable reference to data + pub fn get_mut(&mut self) -> &mut T { + // SAFETY: the caller must guarantee that the instance is only used in one place + unsafe { &mut *self.data.get() } + } } impl Lock<(), B> { -- 2.34.1