[{"id":3683050,"web_url":"http://patchwork.ozlabs.org/comment/3683050/","msgid":"","list_archive_url":null,"date":"2026-04-27T23:52:50","subject":"Re: [PATCH 06/24] rust: pci: implement Sync for Device","submitter":{"id":76823,"url":"http://patchwork.ozlabs.org/api/people/76823/","name":"Gary Guo","email":"gary@garyguo.net"},"content":"On Mon Apr 27, 2026 at 11:11 PM BST, Danilo Krummrich wrote:\n> Implement Sync for Device in addition to Device. The\n> underlying struct pci_dev is the same; Bound is a zero-sized type-state\n> marker that does not affect thread safety.\n>\n> This is needed for pci::Bar to hold &'a Device (required for\n> Bar::into_devres()) while remaining Send.\n>\n> Signed-off-by: Danilo Krummrich \n> ---\n> rust/kernel/pci.rs | 4 ++++\n> 1 file changed, 4 insertions(+)\n>\n> diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs\n> index fe5148f41d8b..6f82f2e6c74f 100644\n> --- a/rust/kernel/pci.rs\n> +++ b/rust/kernel/pci.rs\n> @@ -526,3 +526,7 @@ unsafe impl Send for Device {}\n> // SAFETY: `Device` can be shared among threads because all methods of `Device`\n> // (i.e. `Device) are thread safe.\n> unsafe impl Sync for Device {}\n> +\n> +// SAFETY: Same as `Device` -- the underlying `struct pci_dev` is the same;\n> +// `Bound` is a zero-sized type-state marker that does not affect thread safety.\n> +unsafe impl Sync for Device {}\n\nGiven that you're now implementing for two ctx marker types, it might worth changing\nthe existing one to spell out the `Normal` explicitly (also saves you from\nhaving to spell it out in the comment).\n\nIt might also make sense to write a comment to say that why it's not the case\nfor `Device`.\n\nBest,\nGary","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=garyguo.net header.i=@garyguo.net header.a=rsa-sha256\n header.s=selector1 header.b=x1gtluw0;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-pci+bounces-53298-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (1024-bit key) header.d=garyguo.net header.i=@garyguo.net\n 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1:52 AM CEST, Gary Guo wrote:\n> Given that you're now implementing for two ctx marker types, it might worth changing\n> the existing one to spell out the `Normal` explicitly (also saves you from\n> having to spell it out in the comment).\n\nI don't think this belongs in this commit and I'm not sure it is worth creating\nnew ones for only this purpose.\n\n> It might also make sense to write a comment to say that why it's not the case\n> for `Device`.\n\nI think the documentation in [1] explains (or at least implies) it. Where do you\nsuggest to put such a comment? It seems a bit repretitive to have it for all bus\ndevices.\n\n[1] https://rust.docs.kernel.org/kernel/device/struct.Core.html","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-pci@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=mYIQSHyp;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; helo=sto.lore.kernel.org;\n envelope-from=linux-pci+bounces-53322-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)","smtp.subspace.kernel.org;\n\tdkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=\"mYIQSHyp\"","smtp.subspace.kernel.org;\n arc=none smtp.client-ip=10.30.226.201"],"Received":["from sto.lore.kernel.org (sto.lore.kernel.org\n [IPv6:2600:3c09:e001:a7::12fc:5321])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g4bpS2K1sz1xvV\n\tfor ; Tue, 28 Apr 2026 20:12:32 +1000 (AEST)","from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sto.lore.kernel.org (Postfix) with ESMTP id A6F10301A8F6\n\tfor ; Tue, 28 Apr 2026 10:11:56 +0000 (UTC)","from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id E649D3E63AC;\n\tTue, 28 Apr 2026 10:11:50 +0000 (UTC)","from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org\n [10.30.226.201])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id 525403DA5B5;\n\tTue, 28 Apr 2026 10:11:47 +0000 (UTC)","by smtp.kernel.org (Postfix) with ESMTPSA id EA596C2BCB5;\n\tTue, 28 Apr 2026 10:11:40 +0000 (UTC)"],"ARC-Seal":"i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1777371107; cv=none;\n b=Do7Id1f72BpDebPDOuWQm/EoVBTBzALZUsHnWvy1nbmpgfvsRc51NDL1kt0FOw0Dn5GPVedNlPfiK4edVNQq7HrMyUgXX2tdhlkW6ZbUdRqzcfC3qZ6g9wnRyUn4UURY2QXddwI34ZH5o6y+cULrcytimbQ/QP2jgfpDWDX1kTg=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1777371107; c=relaxed/simple;\n\tbh=uUVYRe/SWz7CWkhpaj4lEG2QqReNvGmhl1Bi48ffDwE=;\n\th=Mime-Version:Content-Type:Date:Message-Id:Subject:Cc:To:From:\n\t References:In-Reply-To;\n b=LtgqiJRes6xv8na4mXe4D8J9O5aQMhbObwuj/dQ6A/YTwJuvZoWddP82T7enNQOfXJHPXINsv3xgefXys9k+9hWfcKGTOTbjjqFByTtrB9gM7BjZ99RVko+c04xBC6NdKYePn2O54c3Rl8g+nzqwKVcR2bj100stCSBhMB4XKLc=","ARC-Authentication-Results":"i=1; smtp.subspace.kernel.org;\n dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org\n header.b=mYIQSHyp; arc=none smtp.client-ip=10.30.226.201","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777371106;\n\tbh=uUVYRe/SWz7CWkhpaj4lEG2QqReNvGmhl1Bi48ffDwE=;\n\th=Date:Subject:Cc:To:From:References:In-Reply-To:From;\n\tb=mYIQSHypxmjuY9JVRb3hTHlbE2NTp6Ym1U26aqZZMnLUIYaneKvzVeqo5G9bUcY2j\n\t gidiGDIhLUpKl1WZVpicI/s+lm9MNpoRKN2NzvYCfif5yRyMjZkJv7UGAEmf3kNDKu\n\t fQAgr0Pe6hNLI8OCaZA1hlZJ7vKOiyXroAoVS8TNLPj+HU4oBRw9YecYWEUHigZ8aZ\n\t nr449W5q6W9qjn6Cnc5qBRtuw81R/E/U/p6WbPPD9+suVuFh1+W5NKBaH2ejoSfWRy\n\t zSTZ2nCrGHSGaZwbvb1lkhaCYDiMQL4GBvY3I+UbAfHtV+n4aE8kySKH0TtOmmCeVn\n\t a9nct9/Dr6mMQ==","Precedence":"bulk","X-Mailing-List":"linux-pci@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","Date":"Tue, 28 Apr 2026 12:11:39 +0200","Message-Id":"","Subject":"Re: [PATCH 06/24] rust: pci: implement Sync for Device","Cc":", ,\n , , ,\n , , ,\n , , ,\n , ,\n , , ,\n , , ,\n , ,\n , ,\n , ,\n , ,\n , ","To":"\"Gary Guo\" ","From":"\"Danilo Krummrich\" ","References":"<20260427221155.2144848-1-dakr@kernel.org>\n <20260427221155.2144848-7-dakr@kernel.org>\n ","In-Reply-To":""}}]