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 X-Spam-Level: X-Spam-Status: No, score=-14.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4EBBAC433B4 for ; Thu, 22 Apr 2021 06:19:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 18F2561437 for ; Thu, 22 Apr 2021 06:19:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230062AbhDVGTq (ORCPT ); Thu, 22 Apr 2021 02:19:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:35622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229547AbhDVGTp (ORCPT ); Thu, 22 Apr 2021 02:19:45 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E070661437; Thu, 22 Apr 2021 06:19:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1619072351; bh=aiNqPvrK3ZBf/RWLu2gvO3kob5vQAnJH+Nma7uJgE88=; h=From:To:Cc:Subject:Date:From; b=VL9qOvsr2nvFrKZcsGAOxDY7RsbjZfM7fSRRg5XWY0QXE1qOJhi6l/zAJeuHoiNSi 4n4fKL8s2YnZodz0Gvbb2OIH52szb02HxHgGZtSz7XVskjXqXynuHgA2BhAkjLZa9U SU3J7Nog+EbcP/IRKaM7VwUbdr3VVYBK7r+1Y0n+7TnNnBo8SndU9QbBiMCLqGkeaO VHwJvQuXnj3tCoBXjga6jvJtwuQ/GV28YpaNXP62Zo1QPeKtDqLSWh72VHivE451yo V+EubptW9xFki40ACOz+J06UIJG30vVc2AfikinF6P0FLp6pQ7AqEheYpFsXgnGPj8 nYuOW8KRCpkgA== From: Mike Rapoport To: linux-arm-kernel@lists.infradead.org Cc: Andrew Morton , Anshuman Khandual , Ard Biesheuvel , Catalin Marinas , David Hildenbrand , Marc Zyngier , Mark Rutland , Mike Rapoport , Mike Rapoport , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v3 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid() Date: Thu, 22 Apr 2021 09:18:58 +0300 Message-Id: <20210422061902.21614-1-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Rapoport Hi, These patches aim to remove CONFIG_HOLES_IN_ZONE and essentially hardwire pfn_valid_within() to 1. The idea is to mark NOMAP pages as reserved in the memory map and restore the intended semantics of pfn_valid() to designate availability of struct page for a pfn. With this the core mm will be able to cope with the fact that it cannot use NOMAP pages and the holes created by NOMAP ranges within MAX_ORDER blocks will be treated correctly even without the need for pfn_valid_within. The patches are only boot tested on qemu-system-aarch64 so I'd really appreciate memory stress tests on real hardware. If this actually works we'll be one step closer to drop custom pfn_valid() on arm64 altogether. v3: * Fix minor issues found by Anshuman * Freshen up the declaration of pfn_valid() to make it consistent with pfn_is_map_memory() * Add more Acked-by and Reviewed-by tags, thanks Anshuman and David v2: Link: https://lore.kernel.org/lkml/20210421065108.1987-1-rppt@kernel.org * Add check for PFN overflow in pfn_is_map_memory() * Add Acked-by and Reviewed-by tags, thanks David. v1: Link: https://lore.kernel.org/lkml/20210420090925.7457-1-rppt@kernel.org * Add comment about the semantics of pfn_valid() as Anshuman suggested * Extend comments about MEMBLOCK_NOMAP, per Anshuman * Use pfn_is_map_memory() name for the exported wrapper for memblock_is_map_memory(). It is still local to arch/arm64 in the end because of header dependency issues. rfc: Link: https://lore.kernel.org/lkml/20210407172607.8812-1-rppt@kernel.org Mike Rapoport (4): include/linux/mmzone.h: add documentation for pfn_valid() memblock: update initialization of reserved pages arm64: decouple check whether pfn is in linear map from pfn_valid() arm64: drop pfn_valid_within() and simplify pfn_valid() arch/arm64/Kconfig | 3 --- arch/arm64/include/asm/memory.h | 2 +- arch/arm64/include/asm/page.h | 3 ++- arch/arm64/kvm/mmu.c | 2 +- arch/arm64/mm/init.c | 16 ++++++++++++++-- arch/arm64/mm/ioremap.c | 4 ++-- arch/arm64/mm/mmu.c | 2 +- include/linux/memblock.h | 4 +++- include/linux/mmzone.h | 11 +++++++++++ mm/memblock.c | 28 ++++++++++++++++++++++++++-- 10 files changed, 61 insertions(+), 14 deletions(-) base-commit: e49d033bddf5b565044e2abe4241353959bc9120 -- 2.28.0