From patchwork Thu Aug 1 00:02:18 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Danilo Krummrich X-Patchwork-Id: 13749358 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3CCBAC52D6D for ; Thu, 1 Aug 2024 00:08:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BE14F6B00B7; Wed, 31 Jul 2024 20:08:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B90F26B00B8; Wed, 31 Jul 2024 20:08:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A0A8A6B00B9; Wed, 31 Jul 2024 20:08:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 803036B00B7 for ; Wed, 31 Jul 2024 20:08:42 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 45A14A0524 for ; Thu, 1 Aug 2024 00:08:42 +0000 (UTC) X-FDA: 82401740484.29.9AD9D53 Received: from sin.source.kernel.org (sin.source.kernel.org [145.40.73.55]) by imf11.hostedemail.com (Postfix) with ESMTP id F2B594000A for ; Thu, 1 Aug 2024 00:08:39 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=vFjQK900; spf=pass (imf11.hostedemail.com: domain of dakr@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=dakr@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1722470865; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=rtC3voiqc1TATSURcgUfsIku0ZqTvicYRBDy27LIdE0=; b=W5CHp2OIs/NGMWPL/aNarGRAAqkSHkudEj04wnoRJGddcFAx0++9K8PLtBvY7wJpTjP/bP +eN3S+6jmJ+bvPcTxM3aeBhmDmElF2R8ZZ7x/H//ps8yS5TWMQhrhlOYGy+2mO/wwwkAmU FknHdjuqiFHAVJ+3d2jyGyRwJrp6Lzc= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1722470865; a=rsa-sha256; cv=none; b=cFAsqRX5TC32aK3M/wSGVId6vpyeYE4iIOFAPMi4EeqnMT/m005rlxbxPdBlkdP5VtYJtd 3QMmK1Xv0+fzKtJ54WZWocYyXVytRROlnJqs5QhqKSvmdNjF5vj1xAdNwUaCTnwrQr1OQG tCYhgC+Qhz0wexh8B2tNo5EupKSzL3A= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=vFjQK900; spf=pass (imf11.hostedemail.com: domain of dakr@kernel.org designates 145.40.73.55 as permitted sender) smtp.mailfrom=dakr@kernel.org; dmarc=pass (policy=none) header.from=kernel.org Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 72A51CE1844; Thu, 1 Aug 2024 00:08:37 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B77D9C116B1; Thu, 1 Aug 2024 00:08:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722470916; bh=YfFWRXZVAmGw9pBzx/NDL1iukdDa6E0oQN8rrPpR/Kk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vFjQK900MVem7/NPiWivgBuvWPaRumOWSO0Nnt4mk6RGp65hrCYT4e/GI56/JgV4+ VpDx++hllAfIAmsSgscJlFRDM07hOaDgzvk73dYpC2k1wFrBnX180bdx0XVBiGEgZ1 5xCzcDrW6Dvsf8q2GcEWOm1v4Qe1rYdSVfuM8Dc/OtDSwspVNV3g/dM42ikVScDKp6 rdRTDJ32ETi+01uzgPzMEHI1mL0I+XEtnmkUhah9xe+LmlzXOKPQAV6YgCvxIlgmsE f/0BbEvO/a0QOEjLRHmpRXjr4hJdLQ0RFCTvbJRALPTFFyVh6Ojo1zNViiXHJHDvFo ccCbvEaVfFZjA== From: Danilo Krummrich To: ojeda@kernel.org, alex.gaynor@gmail.com, wedsonaf@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, benno.lossin@proton.me, a.hindborg@samsung.com, aliceryhl@google.com, akpm@linux-foundation.org Cc: daniel.almeida@collabora.com, faith.ekstrand@collabora.com, boris.brezillon@collabora.com, lina@asahilina.net, mcanal@igalia.com, zhiw@nvidia.com, acurrid@nvidia.com, cjia@nvidia.com, jhubbard@nvidia.com, airlied@redhat.com, ajanulgu@redhat.com, lyude@redhat.com, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-mm@kvack.org, Danilo Krummrich Subject: [PATCH v3 19/25] rust: alloc: remove `VecExt` extension Date: Thu, 1 Aug 2024 02:02:18 +0200 Message-ID: <20240801000641.1882-20-dakr@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240801000641.1882-1-dakr@kernel.org> References: <20240801000641.1882-1-dakr@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: F2B594000A X-Stat-Signature: 1h1xuw344pcuw13amxwm1r8xja5nt8ab X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1722470919-946525 X-HE-Meta: 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 UBSLSI27 ef/jTeZ0TNeOzPJWWJFH0YqZgr/cXnaIube2tO02fk9KM3bQceQH6XXitJ7A5H8Yp+Ae/s9zap/eCzl/F9ZjtSMKPtiXfVXSEl8yjPZYS6AaSRZm2GI4G71BdfL/uDxtXk3T9nZSslzifK11e7BPioZApjgI6r3rL1KpJ244SmDqKvvgkkPSeG2T+MeRcV0zPi3FwkL/1zI7dB1h4QAB73SRyvzLDIplERETvDzbq8mIkRdm5eBaDD20mfC6mX1YxZWMm9C8snnG/v8jn9td9TzASeLQQ8Qv8ZLy9tjl+fLdZR7syZ48SzCC6bw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Now that all existing `Vec` users were moved to the kernel `Vec` type, remove the `VecExt` extension. Signed-off-by: Danilo Krummrich --- rust/kernel/alloc.rs | 1 - rust/kernel/alloc/vec_ext.rs | 185 ----------------------------------- rust/kernel/prelude.rs | 5 +- 3 files changed, 1 insertion(+), 190 deletions(-) delete mode 100644 rust/kernel/alloc/vec_ext.rs diff --git a/rust/kernel/alloc.rs b/rust/kernel/alloc.rs index f2998ad57456..fac9d3976657 100644 --- a/rust/kernel/alloc.rs +++ b/rust/kernel/alloc.rs @@ -6,7 +6,6 @@ pub mod allocator; pub mod kbox; pub mod kvec; -pub mod vec_ext; #[cfg(any(test, testlib))] pub mod allocator_test; diff --git a/rust/kernel/alloc/vec_ext.rs b/rust/kernel/alloc/vec_ext.rs deleted file mode 100644 index 1297a4be32e8..000000000000 --- a/rust/kernel/alloc/vec_ext.rs +++ /dev/null @@ -1,185 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 - -//! Extensions to [`Vec`] for fallible allocations. - -use super::{AllocError, Flags}; -use alloc::vec::Vec; - -/// Extensions to [`Vec`]. -pub trait VecExt: Sized { - /// Creates a new [`Vec`] instance with at least the given capacity. - /// - /// # Examples - /// - /// ``` - /// let v = Vec::::with_capacity(20, GFP_KERNEL)?; - /// - /// assert!(v.capacity() >= 20); - /// # Ok::<(), Error>(()) - /// ``` - fn with_capacity(capacity: usize, flags: Flags) -> Result; - - /// Appends an element to the back of the [`Vec`] instance. - /// - /// # Examples - /// - /// ``` - /// let mut v = Vec::new(); - /// v.push(1, GFP_KERNEL)?; - /// assert_eq!(&v, &[1]); - /// - /// v.push(2, GFP_KERNEL)?; - /// assert_eq!(&v, &[1, 2]); - /// # Ok::<(), Error>(()) - /// ``` - fn push(&mut self, v: T, flags: Flags) -> Result<(), AllocError>; - - /// Pushes clones of the elements of slice into the [`Vec`] instance. - /// - /// # Examples - /// - /// ``` - /// let mut v = Vec::new(); - /// v.push(1, GFP_KERNEL)?; - /// - /// v.extend_from_slice(&[20, 30, 40], GFP_KERNEL)?; - /// assert_eq!(&v, &[1, 20, 30, 40]); - /// - /// v.extend_from_slice(&[50, 60], GFP_KERNEL)?; - /// assert_eq!(&v, &[1, 20, 30, 40, 50, 60]); - /// # Ok::<(), Error>(()) - /// ``` - fn extend_from_slice(&mut self, other: &[T], flags: Flags) -> Result<(), AllocError> - where - T: Clone; - - /// Ensures that the capacity exceeds the length by at least `additional` elements. - /// - /// # Examples - /// - /// ``` - /// let mut v = Vec::new(); - /// v.push(1, GFP_KERNEL)?; - /// - /// v.reserve(10, GFP_KERNEL)?; - /// let cap = v.capacity(); - /// assert!(cap >= 10); - /// - /// v.reserve(10, GFP_KERNEL)?; - /// let new_cap = v.capacity(); - /// assert_eq!(new_cap, cap); - /// - /// # Ok::<(), Error>(()) - /// ``` - fn reserve(&mut self, additional: usize, flags: Flags) -> Result<(), AllocError>; -} - -impl VecExt for Vec { - fn with_capacity(capacity: usize, flags: Flags) -> Result { - let mut v = Vec::new(); - >::reserve(&mut v, capacity, flags)?; - Ok(v) - } - - fn push(&mut self, v: T, flags: Flags) -> Result<(), AllocError> { - >::reserve(self, 1, flags)?; - let s = self.spare_capacity_mut(); - s[0].write(v); - - // SAFETY: We just initialised the first spare entry, so it is safe to increase the length - // by 1. We also know that the new length is <= capacity because of the previous call to - // `reserve` above. - unsafe { self.set_len(self.len() + 1) }; - Ok(()) - } - - fn extend_from_slice(&mut self, other: &[T], flags: Flags) -> Result<(), AllocError> - where - T: Clone, - { - >::reserve(self, other.len(), flags)?; - for (slot, item) in core::iter::zip(self.spare_capacity_mut(), other) { - slot.write(item.clone()); - } - - // SAFETY: We just initialised the `other.len()` spare entries, so it is safe to increase - // the length by the same amount. We also know that the new length is <= capacity because - // of the previous call to `reserve` above. - unsafe { self.set_len(self.len() + other.len()) }; - Ok(()) - } - - #[cfg(any(test, testlib))] - fn reserve(&mut self, additional: usize, _flags: Flags) -> Result<(), AllocError> { - Vec::reserve(self, additional); - Ok(()) - } - - #[cfg(not(any(test, testlib)))] - fn reserve(&mut self, additional: usize, flags: Flags) -> Result<(), AllocError> { - let len = self.len(); - let cap = self.capacity(); - - if cap - len >= additional { - return Ok(()); - } - - if core::mem::size_of::() == 0 { - // The capacity is already `usize::MAX` for SZTs, we can't go higher. - return Err(AllocError); - } - - // We know cap is <= `isize::MAX` because `Layout::array` fails if the resulting byte size - // is greater than `isize::MAX`. So the multiplication by two won't overflow. - let new_cap = core::cmp::max(cap * 2, len.checked_add(additional).ok_or(AllocError)?); - let layout = core::alloc::Layout::array::(new_cap).map_err(|_| AllocError)?; - - let (old_ptr, len, cap) = destructure(self); - - // We need to make sure that `ptr` is either NULL or comes from a previous call to - // `krealloc_aligned`. A `Vec`'s `ptr` value is not guaranteed to be NULL and might be - // dangling after being created with `Vec::new`. Instead, we can rely on `Vec`'s capacity - // to be zero if no memory has been allocated yet. - let ptr = if cap == 0 { - core::ptr::null_mut() - } else { - old_ptr - }; - - // SAFETY: `ptr` is valid because it's either NULL or comes from a previous call to - // `krealloc_aligned`. We also verified that the type is not a ZST. - let new_ptr = unsafe { super::allocator::krealloc_aligned(ptr.cast(), layout, flags) }; - if new_ptr.is_null() { - // SAFETY: We are just rebuilding the existing `Vec` with no changes. - unsafe { rebuild(self, old_ptr, len, cap) }; - Err(AllocError) - } else { - // SAFETY: `ptr` has been reallocated with the layout for `new_cap` elements. New cap - // is greater than `cap`, so it continues to be >= `len`. - unsafe { rebuild(self, new_ptr.cast::(), len, new_cap) }; - Ok(()) - } - } -} - -#[cfg(not(any(test, testlib)))] -fn destructure(v: &mut Vec) -> (*mut T, usize, usize) { - let mut tmp = Vec::new(); - core::mem::swap(&mut tmp, v); - let mut tmp = core::mem::ManuallyDrop::new(tmp); - let len = tmp.len(); - let cap = tmp.capacity(); - (tmp.as_mut_ptr(), len, cap) -} - -/// Rebuilds a `Vec` from a pointer, length, and capacity. -/// -/// # Safety -/// -/// The same as [`Vec::from_raw_parts`]. -#[cfg(not(any(test, testlib)))] -unsafe fn rebuild(v: &mut Vec, ptr: *mut T, len: usize, cap: usize) { - // SAFETY: The safety requirements from this function satisfy those of `from_raw_parts`. - let mut tmp = unsafe { Vec::from_raw_parts(ptr, len, cap) }; - core::mem::swap(&mut tmp, v); -} diff --git a/rust/kernel/prelude.rs b/rust/kernel/prelude.rs index bb80a43d20fb..fcc8656fdb51 100644 --- a/rust/kernel/prelude.rs +++ b/rust/kernel/prelude.rs @@ -14,10 +14,7 @@ #[doc(no_inline)] pub use core::pin::Pin; -pub use crate::alloc::{flags::*, vec_ext::VecExt, Box, KBox, KVBox, KVVec, KVec, VBox, VVec}; - -#[doc(no_inline)] -pub use alloc::vec::Vec; +pub use crate::alloc::{flags::*, Box, KBox, KVBox, KVVec, KVec, VBox, VVec}; #[doc(no_inline)] pub use macros::{module, pin_data, pinned_drop, vtable, Zeroable};