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,SPF_PASS,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 12AD1C433ED for ; Wed, 7 Apr 2021 17:26:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE2CA61369 for ; Wed, 7 Apr 2021 17:26:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343907AbhDGR1A (ORCPT ); Wed, 7 Apr 2021 13:27:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:49260 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229720AbhDGR0t (ORCPT ); Wed, 7 Apr 2021 13:26:49 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C1CB761245; Wed, 7 Apr 2021 17:26:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617816400; bh=X0TznhRQ1rNxYkaGVTvSVgcMdtW1s20eY3i7PGc1DyI=; h=From:To:Cc:Subject:Date:From; b=kIKMCnKJHZUhcF0j7TRm268bp2eLc+q8uBA03fX/4M51X2fyLiGbYbJgsb9Uo6I21 HPBaSbHjaY8Mt3/O+jXaBNnl3BEfPKofjxGs0J75TytOzfeyrX0HvfdhsOZPqUkttf Fgy+TmPa8WFe0YIEAphXWes1GOYabuwCcpMq7ZNwXyik97KHKI+djm/2MmvE77Rvdh vj6VilT6ua5X/fbpSGuFEuS+maCIfhyV4iKeBsfNa1No+2Z3MtRYTEBE9SkwsE9EnL nz6LnCgVALJzCe0wx0D5RN8cd6PH273SeFkyj0yLGbNbbzxsOCgrxMG6SjEeW5+yE8 ka5t4bs9ftKMg== From: Mike Rapoport To: linux-arm-kernel@lists.infradead.org Cc: 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: [RFC/RFT PATCH 0/3] arm64: drop pfn_valid_within() and simplify pfn_valid() Date: Wed, 7 Apr 2021 20:26:04 +0300 Message-Id: <20210407172607.8812-1-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. Mike Rapoport (3): memblock: update initialization of reserved pages arm64: decouple check whether pfn is normal memory 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 | 1 + arch/arm64/kvm/mmu.c | 2 +- arch/arm64/mm/init.c | 10 ++++++++-- arch/arm64/mm/ioremap.c | 4 ++-- arch/arm64/mm/mmu.c | 2 +- mm/memblock.c | 23 +++++++++++++++++++++-- 8 files changed, 35 insertions(+), 12 deletions(-) base-commit: e49d033bddf5b565044e2abe4241353959bc9120 -- 2.28.0