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[73.76.29.249]) by smtp.googlemail.com with ESMTPSA id 5614622812f47-3fe832ce015sm715978b6e.7.2025.03.16.04.17.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 16 Mar 2025 04:17:23 -0700 (PDT) From: Andrew Ballance To: dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, corbet@lwn.net, ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, andrewjballance@gmail.com, acourbot@nvidia.com, nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: [PATCH v2 2/3] rust: alloc: add Vec::resize method Date: Sun, 16 Mar 2025 06:16:43 -0500 Message-ID: <20250316111644.154602-3-andrewjballance@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250316111644.154602-1-andrewjballance@gmail.com> References: <20250316111644.154602-1-andrewjballance@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" implement the equivalent of the rust std's Vec::resize on the kernel's Vec type. Signed-off-by: Andrew Ballance Reviewed-by: Benno Lossin Reviewed-by: Tamir Duberstein --- rust/kernel/alloc/kvec.rs | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/rust/kernel/alloc/kvec.rs b/rust/kernel/alloc/kvec.rs index 18bcc59f0b38..eb6d40a1bf8b 100644 --- a/rust/kernel/alloc/kvec.rs +++ b/rust/kernel/alloc/kvec.rs @@ -554,6 +554,32 @@ pub fn from_elem(value: T, n: usize, flags: Flags) -> = Result { =20 Ok(v) } + + /// Resizes the [`Vec`] so that `len` is equal to `new_len`. + /// + /// If `new_len` is smaller than `len`, the `Vec` is [`Vec::truncate`]= d. + /// If `new_len` is larger, each new slot is filled with clones of `va= lue`. + /// + /// # Examples + /// + /// ``` + /// let mut v =3D kernel::kvec![1, 2, 3]?; + /// v.resize(1, 42, GFP_KERNEL)?; + /// assert_eq!(&v, &[1]); + /// + /// v.resize(3, 42, GFP_KERNEL)?; + /// assert_eq!(&v, &[1, 42, 42]); + /// + /// # Ok::<(), Error>(()) + /// ``` + pub fn resize(&mut self, new_len: usize, value: T, flags: Flags) -> Re= sult<(), AllocError> { + if new_len > self.len() { + self.extend_with(new_len - self.len(), value, flags) + } else { + self.truncate(new_len); + Ok(()) + } + } } =20 impl Drop for Vec --=20 2.48.1