From mboxrd@z Thu Jan 1 00:00:00 1970 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 B16FFC77B7F for ; Tue, 24 Jun 2025 22:11:40 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0A5B86B00A4; Tue, 24 Jun 2025 18:11:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 07D8C6B00A6; Tue, 24 Jun 2025 18:11:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ED5A26B00A7; Tue, 24 Jun 2025 18:11:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id DC7FC6B00A4 for ; Tue, 24 Jun 2025 18:11:39 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 66A7A80E8E for ; Tue, 24 Jun 2025 22:11:39 +0000 (UTC) X-FDA: 83591691918.03.7C3487A Received: from mail-pl1-f174.google.com (mail-pl1-f174.google.com [209.85.214.174]) by imf15.hostedemail.com (Postfix) with ESMTP id 6F29CA000D for ; Tue, 24 Jun 2025 22:11:37 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b="k/47/+L9"; spf=pass (imf15.hostedemail.com: domain of levymitchell0@gmail.com designates 209.85.214.174 as permitted sender) smtp.mailfrom=levymitchell0@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1750803097; 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-type: content-transfer-encoding:content-transfer-encoding:in-reply-to: references:dkim-signature; bh=x5CTRX3KkHlGjcFRk0bbz+0kMSUfqMdaBATBvX6vFFs=; b=zp0HZyIgKkbPxfcOOMLzRzEWNRe3ZwCggKB6Y4sMckBDC4OkJtjqSrZ8rPV/b3poYQJEv/ x3Ov6Ps/mSkRZiqhAR6sjbmfgKS6hsIKBvFDVmCsqbhMPDZWyRYQDAzGrxUvkqLkSd9i9e XizcfhNIAsXp1Uf+kPLuynvggdtK4xY= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b="k/47/+L9"; spf=pass (imf15.hostedemail.com: domain of levymitchell0@gmail.com designates 209.85.214.174 as permitted sender) smtp.mailfrom=levymitchell0@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1750803097; a=rsa-sha256; cv=none; b=j1MBuaIEXxotSaS8qwTtuEPRyzMibVMQabi1m0aPSd6CED9oHyXIUZZnB5bAUGByTFSmNH Js03Y+58rcg7MSK+DaMYQBj9Qt7yl/BqQ6Dtj1slyVW3QFiiEZfN/19TNQ6CzUcjzrz07U S+9M8ZnDIfxONiVcyxUB8xS4P/YccnU= Received: by mail-pl1-f174.google.com with SMTP id d9443c01a7336-23508d30142so82721875ad.0 for ; Tue, 24 Jun 2025 15:11:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1750803096; x=1751407896; darn=kvack.org; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:from:to:cc:subject:date:message-id:reply-to; bh=x5CTRX3KkHlGjcFRk0bbz+0kMSUfqMdaBATBvX6vFFs=; b=k/47/+L922yYZLXgcj+YS4OgBZCjlX622ZcUR1Zi7w7mN/KaDputN/WJxNLfcU8lxN THA5laGAt/L4IOJym34VSVI4Dumq86rtnywq9wS248WgOzQyvhFjCESWS8po0j+WazTl G+YARPOlIdx9hkITnyWiUTZ12ChUDh+b7KmhvGWsjpOEr9rKiN2n95JSc4lKgLdBP9/F 4KF5uAaamrZTv9A3mM8VUdQghtWTHhpwoj1gPg9K1K3BO0ohTJop8Hmnf6tb/B7up+t2 nOaWvkUXEvMLMUtLo7D0v0dVePL1BMor/ZG84xKnyHzCXLLjo4xLLYVwawaHFDefEmSt oX9Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1750803096; x=1751407896; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=x5CTRX3KkHlGjcFRk0bbz+0kMSUfqMdaBATBvX6vFFs=; b=D7bQzMsFBYfit64KHnec+HnHvR4XwoQGTah2QILvXx6KxfpZS2rxmoN0kbWNG3gQCn 71E8Gb3W6VRdISg04bFmsmsLk/5ZelLGpTk/M5qxPsynWYUngBBgnsFtdgOZhCnxusC/ wQ1AmQS1ioTc4Rj3i2hDDLMMNLCfXWFl1zaOhdxJqcnhXI5axAo01B7ukXB65SS2dROD tKV+NILuxEOOIr+tKWM6ts7TbmlTZc9WzSdOvs0LeDeG++NYkFEaePBZOtQ2lBG+d0vD o1uOZSYYfjg7S/rgcSBtQ75MQP9usQFfjibvySm8m8p8DUZpZJHBGnMTm/1wIoFhBA/S x9iw== X-Forwarded-Encrypted: i=1; AJvYcCVifkg5vD1JxleXe9mHkAfGqFJbd92I59frP5eL/Pqi9qSlVz1xDj2QTmR4CdzB/xQXDIaViFAU7w==@kvack.org X-Gm-Message-State: AOJu0Ywbv/Ad3gu53bg3EJM19vcbqtWWBbClLS1/oWQOPjP5vf8Hs+TJ 5UgGHGD0rYmt4TfkPS46/P5VtYH/L/s+iX4YCyDHn1EflAqPvJTEdkF4 X-Gm-Gg: ASbGnct/5cHvPtRYFoodfc2Y2EknKNtV4TKkToNxHQTDqLgk+5TPW5CVwoy2qQL7ZR6 CzCqgMrT2JlIr8SucqouteIUfJDpJKF7r1IiPupB9GXyse7OofXVSGRTWFvISfICa+cVE/a/ETE wWVecpHBfq2GmX3qFXjNIL/M1X+a6AE0bVYqdeAHfNmUfw+axk9XFs8zfJRYDlCujNQukvxVy7T rTGUEbOPVznvva7t5GO8lkl81IksF7QBwMv7AOEWDd2PnXwONT7ddckQbMNKq5SenhnM8DPe9vz F/Se2Ws1kTpBo5StqA2nEpliuZL1eHBMUI4kQ5epIf8dYQ0Wh/ZvUJRjlasP1rzPVk+0d9vFmg6 laQLYenMOO6thA4/NPZNx8O7ydsC4WTGR5GEA X-Google-Smtp-Source: AGHT+IFFPWi8QliFPd0Sc0o/w6WVvHWZb5kz2zNwHPi3lUANiWLNoGoJO3ziNo+Tyc4IekT813aVyg== X-Received: by 2002:a17:903:f87:b0:234:f6ba:e689 with SMTP id d9443c01a7336-23824060218mr13677935ad.39.1750803095199; Tue, 24 Jun 2025 15:11:35 -0700 (PDT) Received: from mitchelllevy.localdomain (82.sub-174-224-205.myvzw.com. [174.224.205.82]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-237d8393741sm114580555ad.15.2025.06.24.15.11.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Jun 2025 15:11:34 -0700 (PDT) From: Mitchell Levy Subject: [PATCH 0/5] rust: Add Per-CPU Variable API Date: Tue, 24 Jun 2025 15:10:38 -0700 Message-Id: <20250624-rust-percpu-v1-0-9c59b07d2a9c@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAF4iW2gC/1WPzQ6CMBAGX4X0bE13SyN48j2Mh0IXaCI/ttBoC O9uQU3kOJvM5NuZeXKWPDsnM3MUrLd9FwEOCSsb3dXErYnMUGAqMpDcTX7kA7lymDhprFRaKKO lZNEYHFX2udWut8iN9WPvXls8wHrdOoCQ7zoBuOAocoATZYgFXOpW2/ux7Fu2dgL+XCVSSPcuR leRFkYYAqnVv7t8Rjl6TPGz8btsWd6pONLn9wAAAA== To: Miguel Ojeda , Alex Gaynor , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Andreas Hindborg , Alice Ryhl , Trevor Gross , Andrew Morton , Dennis Zhou , Tejun Heo , Christoph Lameter , Danilo Krummrich , Benno Lossin Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-mm@kvack.org, Mitchell Levy X-Mailer: b4 0.14.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1750803093; l=2390; i=levymitchell0@gmail.com; s=20240719; h=from:subject:message-id; bh=RTSbQoXKHsJIMZB/LCsqqSlNCWAUFs2E7e/I2KFZoEM=; b=HO/BzmilRVBVwNy132xyPGNkLjGLx1se+HvW0IVE9mKLmIXGQvugfkSRmtWBvt+3CYYVKm6Oj 0TRTlZdZbkuC09DhGtWYqdPUJVMU/xxvSmDo/VQhv7whkGPZxNHe7h8 X-Developer-Key: i=levymitchell0@gmail.com; a=ed25519; pk=n6kBmUnb+UNmjVkTnDwrLwTJAEKUfs2e8E+MFPZI93E= X-Rspamd-Queue-Id: 6F29CA000D X-Stat-Signature: nnwsqa5mcsc1gq7dmpqu6ue81e9o31qk X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1750803097-881189 X-HE-Meta: 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 iye+W4TX 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 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: This series adds an API for declaring an using per-CPU variables from Rust, and it also adds support for Rust access to C per-CPU variables (subject to some soundness requirements). It also adds a small test module, lib/percpu_test_rust.rs, in the vein of lib/percpu_test.c. --- Signed-off-by: Mitchell Levy --- Changes in RFC v2: - Renamed PerCpuVariable to StaticPerCpuSymbol to be more descriptive - Support dynamically allocated per-CPU variables via the PerCpuAllocation type. Rework statically allocated variables to use this new type. - Make use of a token/closure-based API via the PerCpu and PerCpuToken types, rather than an API based on PerCpuRef that automatically Deref(Mut)'s into a &(mut) T. - Rebased - Link to RFC: https://lore.kernel.org/r/20241219-rust-percpu-v1-0-209117e822b1@gmail.com --- Changes in v1: - Use wrapping_add in `PerCpuPtr::get_ref` since overflow is expected. - Separate the dynamic and static cases, with shared logic in a `PerCpuPtr` type. - Implement pin-hole optimizations for numeric types - Don't assume `GFP_KERNEL` when allocating the `Arc` in the dynamic case. - Link to RFC v2: https://lore.kernel.org/r/20250414-rust-percpu-v2-0-5ea0d0de13a5@gmail.com --- Mitchell Levy (5): rust: percpu: introduce a rust API for per-CPU variables rust: rust-analyzer: add lib to dirs searched for crates rust: percpu: add a rust per-CPU variable test rust: percpu: Add pin-hole optimizations for numerics rust: percpu: cache per-CPU pointers in the dynamic case lib/Kconfig.debug | 9 ++ lib/Makefile | 1 + lib/percpu_test_rust.rs | 156 +++++++++++++++++++ rust/helpers/helpers.c | 2 + rust/helpers/percpu.c | 20 +++ rust/helpers/preempt.c | 14 ++ rust/kernel/lib.rs | 3 + rust/kernel/percpu.rs | 306 ++++++++++++++++++++++++++++++++++++++ rust/kernel/percpu/cpu_guard.rs | 35 +++++ rust/kernel/percpu/numeric.rs | 117 +++++++++++++++ scripts/generate_rust_analyzer.py | 2 +- 11 files changed, 664 insertions(+), 1 deletion(-) --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20240813-rust-percpu-ea2f54b5da33 Best regards, -- Mitchell Levy