From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04C5E1552FD for ; Tue, 5 Aug 2025 17:07:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754413680; cv=none; b=SxZRliRPINoQRuag9gWXwJpGhiDfXhGWgdHYWoUFPBrVfo1XJ0GzCwNQEXQ/S7ACEaVWxv2L42zdz/Im7yAUM/7pGq+MKmS8PdDRsAQg/7LTVP6Wja0REeSFmV4FI3Ql48s71gCMK8lTYSGxLCrREVUKSoU9kOmkByb7mX07pJ4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754413680; c=relaxed/simple; bh=wpNqNfSCN2AqcBm2ScYSGy1bZWEyeXW/coNkyXBwcMo=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=KmNs6l2pW7lbJK2UfuQ2JGly3iQooVx07xvQXQflq7NCXLIkxy/9MFa19n1/yPqLQrVgNOPJCUe4x4yba9CXWcRD4IUbLyoJ0LeQq8E1k/C7VkUWAZudVeESdjZXIqoZjICN9lLzXf4DfoxCZJoxOczKNFxPqi5W8CzFe6Nf7fw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=E3d/Z8F9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="E3d/Z8F9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D1A22C4CEF0; Tue, 5 Aug 2025 17:07:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754413679; bh=wpNqNfSCN2AqcBm2ScYSGy1bZWEyeXW/coNkyXBwcMo=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=E3d/Z8F9xI8TG7grQXif7ZrYxQ8tkPmDhtcajXeXgyuPB04gM6T+adcVmxpWPQcMo 6uN/5PyTobI3yl1ovGum7YgdiVyJRTMrhd3XlfaLxMrSUq5ENmjwSyZg5BAuWIihic Vs4135RAN0JKE/ZjhlhdVnAAfZKMO8aogSa6lYS7GscHet4jvGk/tfo7vR5ooi5sCY W2HcoKX4GnIoKJ/6ZD/h1zCUbon5bqn4+t45Oclck78nk72eULtOF61daNirZ7waLz YGtMz03KzjyhkFLLWwVV/NYMpbvTTdZzYxlDtKrzkfKoylWrsJ7xuKXxIIcv6XY/1m ebCbVJEFDpYcw== From: Andreas Hindborg To: Daniel Almeida , Danilo Krummrich Cc: ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, lossin@kernel.org, aliceryhl@google.com, tmgross@umich.edu, abdiel.janulgue@gmail.com, acourbot@nvidia.com, rust-for-linux@vger.kernel.org Subject: Re: [PATCH] rust: page: implement BorrowedPage In-Reply-To: References: <20250804195023.150399-1-dakr@kernel.org> <731A34A7-92AD-47EA-A17A-C25FA94A5144@collabora.com> Date: Tue, 05 Aug 2025 19:07:50 +0200 Message-ID: <87sei58zo9.fsf@kernel.org> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable "Daniel Almeida" writes: >> On 5 Aug 2025, at 09:53, Danilo Krummrich wrote: >> >> On Tue Aug 5, 2025 at 2:30 PM CEST, Daniel Almeida wrote: >>> Hi Danilo, >>> >>>> On 4 Aug 2025, at 16:50, Danilo Krummrich wrote: >>>> >>>> Currently, a Page always owns the underlying struct page. >>>> >>>> However, sometimes a struct page may be owned by some other entity, e.= g. >>>> a vmalloc allocation. >>>> >>>> Hence, introduce BorrowedPage to support such cases, until the Ownable >>>> solution lands. >>> >>> I guess it=E2=80=99s a good idea to expand this part somewhat. Taken as= it is, >>> there is no way to know what =E2=80=9Cthe Ownable solution=E2=80=9D is. >> >> What do you suggest? >> >> I can link where the type has been proposed by Boqun [1]. >> >> [1] https://lore.kernel.org/rust-for-linux/ZnCzLIly3DRK2eab@boqun-archli= nux/ > > Just this link is fine IMHO. I wasn=E2=80=99t aware of this discussion. > As far as I know, "[PATCH v11 0/4] New trait OwnableRefCounted for ARef<->Owned conversion." [1] is the latest and greatest. Best regards, Andreas Hindborg [1] https://lore.kernel.org/r/20250618-unique-ref-v11-0-49eadcdc0aa6@pm.me