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charset="utf-8" Content-Transfer-Encoding: quoted-printable This introduces a basic method that our custom Vec is missing. I expect that it will be used in many places, but at the time of writing, Rust Binder has six calls to Vec::pop. Signed-off-by: Alice Ryhl --- rust/kernel/alloc/kvec.rs | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/rust/kernel/alloc/kvec.rs b/rust/kernel/alloc/kvec.rs index 412a2fe3ce79a0681175bf358e8e0f628e77e875..ebca0cfd31c67f3ce13c4825d70= 39e34bb54f4d4 100644 --- a/rust/kernel/alloc/kvec.rs +++ b/rust/kernel/alloc/kvec.rs @@ -320,6 +320,37 @@ pub fn push(&mut self, v: T, flags: Flags) -> Result<(= ), AllocError> { Ok(()) } =20 + /// Removes the last element from a vector and returns it, or `None` i= f it is empty. + /// + /// # Examples + /// + /// ``` + /// let mut v =3D KVec::new(); + /// v.push(1, GFP_KERNEL)?; + /// v.push(2, GFP_KERNEL)?; + /// assert_eq!(&v, &[1, 2]); + /// + /// assert_eq!(v.pop(), Some(2)); + /// assert_eq!(v.pop(), Some(1)); + /// assert_eq!(v.pop(), None); + /// # Ok::<(), Error>(()) + /// ``` + pub fn pop(&mut self) -> Option { + if self.is_empty() { + return None; + } + + let removed: *mut T =3D { + // SAFETY: We just checked that the length is at least one. + let slice =3D unsafe { self.dec_len(1) }; + // SAFETY: The argument to `dec_len` was 1 so this returns a s= lice of length 1. + unsafe { slice.get_unchecked_mut(0) } + }; + + // SAFETY: The guarantees of `dec_len` allow us to take ownership = of this value. + Some(unsafe { removed.read() }) + } + /// Creates a new [`Vec`] instance with at least the given capacity. /// /// # Examples --=20 2.49.0.805.g082f7c87e0-goog