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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1DD82E9A02C for ; Wed, 18 Feb 2026 14:42:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EB0A96B008A; Wed, 18 Feb 2026 09:42:31 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E63976B0089; Wed, 18 Feb 2026 09:42:31 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D608D6B008A; Wed, 18 Feb 2026 09:42:31 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id C15506B0088 for ; Wed, 18 Feb 2026 09:42:31 -0500 (EST) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 6BCD7885B8 for ; Wed, 18 Feb 2026 14:42:31 +0000 (UTC) X-FDA: 84457843302.27.A0E1689 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf21.hostedemail.com (Postfix) with ESMTP id A24AB1C000F for ; Wed, 18 Feb 2026 14:42:29 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WOuraL88; spf=pass (imf21.hostedemail.com: domain of lossin@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=lossin@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771425749; 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:in-reply-to:references:references:dkim-signature; bh=PZoN6rgqXFANwvlFQuV5YKsznFFpjqxGG6yysl7W1Mg=; b=4zTHJ0adU3eBvvodZJXr13GKFCW/KHiMGdFqKwK5O39efHNAEoxB5265MF0xoHYNv45VNh EE+NUOqI5vZsdruuopzQW9KmWKXz7lBx9wie1u0YU2U+xIK5oiUOqSuwD1p2noDr4m9rii AkHrjQjCCFN+CjHZkdFwz/E7/ydi0/A= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=WOuraL88; spf=pass (imf21.hostedemail.com: domain of lossin@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=lossin@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771425749; a=rsa-sha256; cv=none; b=y2Gl3SwVMd3Sd2Uq2fw3b7FNFUk7Vmqj3dVg/Iy8gQGBjCwBAaeSrNJ4iUnXUqVbXjQanE nbFiNas/u2/sogfZRZ/RkHch2x1duDRrSApSjc4m/KXz0JANYBR+RZXFNpHxdm80RRVu1b 1DDVtLbmebS0JbxUhUtV31hLXYkxNV4= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id E697C600AE; Wed, 18 Feb 2026 14:42:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 538D6C116D0; Wed, 18 Feb 2026 14:42:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771425748; bh=6GPMVdt+2peIzfNOCgaGLfLM2Thd6H8NgtP6G0RDwEg=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WOuraL88EbRfrvLI1WBAyqV6X1XC3KTqovM1+IdLWw5Rcd/bInss17hx4iZLH8YzR PdtMHLan4I9P7JhvOvEhDqv4mVBgfhaKg7Ceh2KaQMs7BSfXxt8Z2FRvdznrzwDxA2 nVoZSFzVtHd7J82khdVqpnmsHzKxOMM7z0g70b2hAhRwuUTvd3ej5omsZ3zXcphzSQ o1Au9Ip8mxgLVlblTAo647x7SRcp6PtkoGiEcT4HysQW2j53ecV4CBhVWivu8KMv5+ Z8BE+o/9fHcQVjyBT1C8n9li8Oyl4qZhAQQT8ukbxUuY9qbcOlx+TfH2VvJL3LXh+Z EqqCOHsOty3bA== Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 18 Feb 2026 15:42:23 +0100 Message-Id: From: "Benno Lossin" To: "Alice Ryhl" , "Miguel Ojeda" Cc: "Andreas Hindborg" , "Lorenzo Stoakes" , "Liam R. Howlett" , "Miguel Ojeda" , "Boqun Feng" , "Gary Guo" , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , "Trevor Gross" , "Danilo Krummrich" , "Will Deacon" , "Peter Zijlstra" , "Mark Rutland" , , , Subject: Re: [PATCH v3] rust: page: add byte-wise atomic memory copy methods X-Mailer: aerc 0.21.0 References: <20260213-page-volatile-io-v3-1-d60487b04d40@kernel.org> In-Reply-To: X-Stat-Signature: c4brqadadgbhd41xq13qic1z53upq176 X-Rspam-User: X-Rspamd-Queue-Id: A24AB1C000F X-Rspamd-Server: rspam01 X-HE-Tag: 1771425749-499481 X-HE-Meta: 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 bFNmj1H9 X5zWhf70MtZmLIhUbvWSh8VB4p2oZxmXEWkh9SFU7+zAXuZLqDodX7mG95bwy0OIE4zmiZe87u1oTSi7gzrN7M+UZU6kuAR9TRk6Iij6JLhB/IGprXL+lt1ILKaguh+WgNaH+EkfikVZbTVaNkPJ3mBTt1JdjVOaDTdALMII2aEKB6rXCI5A4vT+j1miJDh+3Qcx4023qM1L/XmPnfFRrXfl7RDpCUWElBeG6dM5sqQJElkiQZZt4sBYvmbG5Q7GzheTvFV6uGqfcNBJpA+QxHvrIZaEBnPhxqV647OsV+Q8mkCPlZtnc75M07wwQnE56MyidWMd3PP31IZj95luYKdpLvQ== 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: On Wed Feb 18, 2026 at 1:00 PM CET, Alice Ryhl wrote: > On Wed, Feb 18, 2026 at 12:57=E2=80=AFPM Miguel Ojeda > wrote: >> > + /// - For the duration of the call, other accesses to the areas d= escribed by `src` and `len`, >> > + /// must not cause data races (defined by [`LKMM`]) against ato= mic operations executed by this >> > + /// function. Note that if all other accesses are atomic, then = this safety requirement is >> > + /// trivially fulfilled. >> >> And, for this one, Benno said perhaps we should introduce a shorthand. > > valid for atomic reads? Yes, in particular it should be folded in with the "valid for reads" above, since that would otherwise be conflicting. Cheers, Benno