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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4F365C48BC4 for ; Thu, 15 Feb 2024 19:21:49 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4TbQ0q677Mz3vcl for ; Fri, 16 Feb 2024 06:21:47 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=2604:1380:40e1:4800::1; helo=sin.source.kernel.org; envelope-from=cmarinas@kernel.org; receiver=lists.ozlabs.org) Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4TbQ0N5tLvz3dHK for ; Fri, 16 Feb 2024 06:21:24 +1100 (AEDT) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 1FA8CCE1C49; Thu, 15 Feb 2024 19:21:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 852F2C433F1; Thu, 15 Feb 2024 19:21:15 +0000 (UTC) Date: Thu, 15 Feb 2024 19:21:13 +0000 From: Catalin Marinas To: Ryan Roberts Subject: Re: [PATCH v6 10/18] arm64/mm: New ptep layer to manage contig bit Message-ID: References: <20240215103205.2607016-1-ryan.roberts@arm.com> <20240215103205.2607016-11-ryan.roberts@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240215103205.2607016-11-ryan.roberts@arm.com> X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , Kefeng Wang , x86@kernel.org, David Hildenbrand , Yang Shi , Dave Hansen , linux-mm@kvack.org, Andrey Ryabinin , "H. Peter Anvin" , Will Deacon , Ard Biesheuvel , Marc Zyngier , Alistair Popple , Barry Song <21cnbao@gmail.com>, Matthew Wilcox , Ingo Molnar , Zi Yan , John Hubbard , Borislav Petkov , Thomas Gleixner , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, James Morse , Andrew Morton , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Thu, Feb 15, 2024 at 10:31:57AM +0000, Ryan Roberts wrote: > Create a new layer for the in-table PTE manipulation APIs. For now, The > existing API is prefixed with double underscore to become the > arch-private API and the public API is just a simple wrapper that calls > the private API. > > The public API implementation will subsequently be used to transparently > manipulate the contiguous bit where appropriate. But since there are > already some contig-aware users (e.g. hugetlb, kernel mapper), we must > first ensure those users use the private API directly so that the future > contig-bit manipulations in the public API do not interfere with those > existing uses. > > The following APIs are treated this way: > > - ptep_get > - set_pte > - set_ptes > - pte_clear > - ptep_get_and_clear > - ptep_test_and_clear_young > - ptep_clear_flush_young > - ptep_set_wrprotect > - ptep_set_access_flags > > Tested-by: John Hubbard > Signed-off-by: Ryan Roberts Acked-by: Catalin Marinas