From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 80D1D3BE642; Thu, 1 Oct 2026 11:26:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790853984; cv=none; b=MT9B2RR4DGozpX5lbbHRZwRjbDtiJfeF9ZGzSjGMTXjJNCy3W87pCZy6K7nQyJYJ8zt/D1+IFQJLQgCUZK2th8iU1DIt8OOIOTjn+p1hhxJujkadNMooM/UVnznb3Hgrdk/FL68Vk0oFtf+bfH8+wnc4iKABuNqb7ptAcSXvpfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790853984; c=relaxed/simple; bh=vRLiWbdt51m7vPe9Gom4OG4BDpZhEgQW1nA/ijA6VlA=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Bm51NAmJBHvmYCvDuxj+yOg6UwuedmZg4mBoK0bcoX/54E0/gCLAP5n5ixQYym9fTIjw+hDy3piQfITiP+42cG2SwOSicav6QB7SEsy0U857433AxWke60OnsZl/nPKx6P2RJZPxqB38FC1KCwvz+2OjO891/EBVnMZKn5411gM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=NVCLDxeT; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="NVCLDxeT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9CD141F000FF; Thu, 1 Oct 2026 11:25:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790853983; bh=Gpkw0FkXm2sEcS5oXM/km9M95p6Lr/sv8WQxRY54vDc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=NVCLDxeTK413A0ZVScuOliWCL/BeACZG41ga59YonpVi33x8PdZhsMtn/8oq+ygOX ZKav51j3DB5hvxSALe8T+A85q01eQsw34pLNny1jJJ57fF2idAnltjr0LE9PQl0VtO 2EgWIzgB/LmAzc1XT/UYRxAbbgoVPexalg8KVzcWsDnpuRLWtkfE2p7YRoWrQHp6d6 Kpr9E/bjHpPeAud/sdVZeQRfNhP7XdrgducvsrOUBbVhR6XxxcX0rYUJMUmE+ipY0X +8tC+AQSxR9a/ZEWQqt9Y7lkR9+EqYVsu+deESVKbABTftQ15M+EZ1nyBJoEfAoSbU mz8vJo6ciRt9w== Message-ID: Date: Thu, 1 Oct 2026 13:25:48 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/9] mm: use hw_pte_t for generic PTE table storage To: Muhammad Usama Anjum , Anshuman Khandual Cc: Andrew Morton , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Xu Xin , Chengming Zhou , Jann Horn , Muchun Song , Oscar Salvador , Pedro Falcato , Arnd Bergmann , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Pasha Tatashin , Rik van Riel , Harry Yoo , Lance Yang , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Uladzislau Rezki , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Ian Rogers , Adrian Hunter , James Clark , SJ Park , "Matthew Wilcox (Oracle)" , Jan Kara , Jason Gunthorpe , John Hubbard , Peter Xu , Leon Romanovsky , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl Shutsemau , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Miaohe Lin , Naoya Horiguchi , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Dennis Zhou , Tejun Heo , Christoph Lameter , Johannes Weiner , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Simona Vetter , Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-perf-users@vger.kernel.org, damon@lists.linux.dev, kasan-dev@googlegroups.com, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, xen-devel@lists.xenproject.org References: <20260922-pte0-v3-0-5670b8cb9059@arm.com> <20260922-pte0-v3-3-5670b8cb9059@arm.com> <63db3469-82d0-4997-9bcf-31bb3aa59deb@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 9/30/26 19:40, Muhammad Usama Anjum wrote: > On 30/09/2026 5:35 am, Anshuman Khandual wrote: >> On Tue, Sep 22, 2026 at 06:12:31PM +0100, Muhammad Usama Anjum wrote: >>> Generic page-table interfaces use pte_t * for both pointers to PTE table >>> storage and pointers to software PTE values. Convert the generic >>> declarations and their MM, fs, and kernel users together so parameters, >>> return types, callbacks, and local pointers that designate table storage >>> use hw_pte_t *. >>> >>> Include linux/pgtable_types.h from headers that expose the converted >>> interfaces. It continues to provide pgprot_t to vmalloc.h through >>> asm/page.h. >>> >>> Keep software PTE values as pte_t and retain pte_t * for value interfaces. >>> >>> No architecture selects ARCH_HAS_HW_PTE_T at this point, so hw_pte_t >>> remains an alias of pte_t and this changes the interface vocabulary without >>> changing representation or behavior. >>> >>> Most of this mechanical conversion was generated with the Coccinelle script >>> included in the cover letter. The script deliberately ignores pte_t * >> >> Just wondering - should this Coccinelle script that converted all these >> instances be saved inside ./scripts/coccinelle/ for future referene. > > Thanks for the suggestion. This script was written for this one-time conversion > and requires manual review to distinguish HW PTE table pointers from SW PTE > pointers. After the conversion, it would not be useful. > (Maybe other arch can use it to do their conversion. But they can always > copy script from the series) Agreed, the script is not expected to be reused once merged. Which is different to other conversions where the old way of doing it can silently sneak in again. -- Cheers, David