From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f73.google.com (mail-wr1-f73.google.com [209.85.221.73]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 711C03E95B1 for ; Mon, 27 Apr 2026 18:07:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.73 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777313255; cv=none; b=LMh/6wmtXtNeCTAkQIolcz/dCDSCrLaaab1KYY2so3RiByUzCA04LNtJa0Gc+U/Dswl94kmbnmo8xrMRcRO2RqEVgfxVNG4G/c9Fz9l3OmmWbbmEsgAfQO0Tw5DhPHqzFbYrmPDl/Z4WYUHFcTsmAm5nnqO0mA3HrvjRt23tTt8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777313255; c=relaxed/simple; bh=LJB/6F8gRS18jiwpo8qTgtmT08hQ2iYqeOWrm4IbRjM=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=AZRuVVgZal9hcMwttr8kqza1aM9JZcoRgw7w1iQYfZBmSZ5c4OGseCM8lRSdoLMaMJ/0WBAAUc6o954g04tkds7eCKdcD2t4XuVO4k26l7o9sBYAzUCc7q55XP7Zkhvr98NpD0qimuqpUXyv+u7tzrek3d/jK81T3oexk42LYCQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--aliceryhl.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ecgiAdBE; arc=none smtp.client-ip=209.85.221.73 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--aliceryhl.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ecgiAdBE" Received: by mail-wr1-f73.google.com with SMTP id ffacd0b85a97d-43d1fec59c9so6958387f8f.0 for ; Mon, 27 Apr 2026 11:07:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1777313250; x=1777918050; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=HxkgeF4LNZGOlYkWj+Rbzgew6yzkspsu2lszfChr6II=; b=ecgiAdBEj8O0ohLuDtRQNy1b1M/osw9dFru5e0itODJbI62UrYiyNERjIlWYw5Vusu ocE7995c/7GNW/CKaJ5cVf9BHcustPHdgEf5ZHAXgdmUdHtfFReNNAo7qFI5N0gcRBtq e7Trcn/bvNv/eEsMQQBk7pfHfMFvesG+b0HepbRCZqQXqrZ4NA+Z4dbXKO7Zo7/neEhc qgqMa/Vu19sjM/mU5pvPNMIrsOHQY6p8ZnuJLyglii9r7yQdZx0eFNIBlWTDtn4Tsosa LFJiaSo3F2Fg0inLBbIGSa6Pqje+NJZiB9kMrrYgo8sBwZjQ0oPnWQ3a9C2JVspbrOUf pgdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777313250; x=1777918050; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=HxkgeF4LNZGOlYkWj+Rbzgew6yzkspsu2lszfChr6II=; b=AoqVRZs5xmFouFv5NYlOq/oYaJ4Vmq1rCRNuiaWJnMBFO8vjmEXjxjCgUgCXlW4IMx 0yoU6clbJhWtpu5uijeUxdZBdq7vSmjEnTnT07J7wJ726Je7L8wV6nNHr4btYUeKpp1k 1GEXDNceUDOzusNvPqG7Ek79T5wh537MObkNELThfrjsoM5rTwWKm3RLF8A5fqHqIhaQ dEEnbL6wuFh520brKGYGOG+ggxH1LkanK6Mx23YI20dsccK1E+r9hce2u3ku+VkewWEa heBapAUqcjLdMBaRNEXoZoHvt+GBvMcN62h/p024TriwTx0GgsnsSroG4/gwJWlC8Mvk myoA== X-Forwarded-Encrypted: i=1; AFNElJ+fwgsx7gJqJKOfwjpTh5ATAZttMoM69kB/nD/FeukmK7S0aYHUH1FWRgP9QGpwONIGasD/p29XtrhQrefa@lists.linux.dev X-Gm-Message-State: AOJu0Yy5gi+FtfJ+Xrpc48tSwbTNrZr7eirpgwgiZ/Q5sZWQdoEWcgTQ y31Lbh4UR/COidm7q8e9aAaJ1XQ8xKcxrdh3DcRnzl1M5y0Us3BmXqYcBpeLPbZ6VnhFgh04+nu +4wWixf5qedSKyJSl1Q== X-Received: from wrmd3.prod.google.com ([2002:adf:e883:0:b0:43d:7940:a11b]) (user=aliceryhl job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6000:41c7:b0:43d:799c:b2cb with SMTP id ffacd0b85a97d-44636a393e7mr256856f8f.24.1777313249648; Mon, 27 Apr 2026 11:07:29 -0700 (PDT) Date: Mon, 27 Apr 2026 18:07:28 +0000 In-Reply-To: <289b424e243ba2c4139ea04009cf8b9c448a87ff.1777306795.git.chleroy@kernel.org> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <289b424e243ba2c4139ea04009cf8b9c448a87ff.1777306795.git.chleroy@kernel.org> Message-ID: Subject: Re: [RFC PATCH v1 5/9] uaccess: Switch to copy_{to/from}_user_partial() when relevant From: Alice Ryhl To: "Christophe Leroy (CS GROUP)" Cc: Yury Norov , Andrew Morton , Linus Torvalds , David Laight , Thomas Gleixner , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, dmaengine@vger.kernel.org, linux-efi@vger.kernel.org, linux-fsi@lists.ozlabs.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-wpan@vger.kernel.org, netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-spi@vger.kernel.org, linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-serial@vger.kernel.org, linux-usb@vger.kernel.org, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, ocfs2-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-x25@vger.kernel.org, rust-for-linux@vger.kernel.org, linux-sound@vger.kernel.org, sound-open-firmware@alsa-project.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-arch@vger.kernel.org Content-Type: text/plain; charset="utf-8" On Mon, Apr 27, 2026 at 07:13:46PM +0200, Christophe Leroy (CS GROUP) wrote: > diff --git a/rust/helpers/uaccess.c b/rust/helpers/uaccess.c > index 01de4fbbcc84..710e07cd60ae 100644 > --- a/rust/helpers/uaccess.c > +++ b/rust/helpers/uaccess.c > @@ -5,13 +5,13 @@ > __rust_helper unsigned long > rust_helper_copy_from_user(void *to, const void __user *from, unsigned long n) > { > - return copy_from_user(to, from, n); > + return copy_from_user_partial(to, from, n); > } > > __rust_helper unsigned long > rust_helper_copy_to_user(void __user *to, const void *from, unsigned long n) > { > - return copy_to_user(to, from, n); > + return copy_to_user_partial(to, from, n); > } No Rust code uses the return value for anything other than comparing it with zero, so you can keep these as copy_[from|to]_user() without issues. Thanks, Alice