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=-15.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 F186CC433DB for ; Fri, 12 Feb 2021 07:14:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBE9764E6B for ; Fri, 12 Feb 2021 07:14:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229862AbhBLHN7 (ORCPT ); Fri, 12 Feb 2021 02:13:59 -0500 Received: from foss.arm.com ([217.140.110.172]:33142 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229497AbhBLHNv (ORCPT ); Fri, 12 Feb 2021 02:13:51 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 5233D12FC; Thu, 11 Feb 2021 23:13:06 -0800 (PST) Received: from [192.168.0.130] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CF0653F73D; Thu, 11 Feb 2021 23:13:02 -0800 (PST) Subject: Re: [PATCH 2/3] arm64/hugetlb: Enable HUGETLB_PAGE_SIZE_VARIABLE To: Christoph Hellwig Cc: linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, akpm@linux-foundation.org, will@kernel.org, Robin Murphy , Marek Szyprowski , David Hildenbrand , Mark Rutland , iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org References: <1613024531-19040-1-git-send-email-anshuman.khandual@arm.com> <1613024531-19040-3-git-send-email-anshuman.khandual@arm.com> <20210211080148.GB14448@lst.de> From: Anshuman Khandual Message-ID: <768e2ee2-93a5-02ec-4842-41e1242a6bef@arm.com> Date: Fri, 12 Feb 2021 12:43:27 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210211080148.GB14448@lst.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2/11/21 1:31 PM, Christoph Hellwig wrote: > On Thu, Feb 11, 2021 at 11:52:10AM +0530, Anshuman Khandual wrote: >> MAX_ORDER which invariably depends on FORCE_MAX_ZONEORDER can be a variable >> for a given page size, depending on whether TRANSPARENT_HUGEPAGE is enabled >> or not. In certain page size and THP combinations HUGETLB_PAGE_ORDER can be >> greater than MAX_ORDER, making it unusable as pageblock_order. >> >> This enables HUGETLB_PAGE_SIZE_VARIABLE making pageblock_order a variable >> rather than the compile time constant HUGETLB_PAGE_ORDER which could break >> MAX_ORDER rule for certain configurations. >> >> Cc: Catalin Marinas >> Cc: Will Deacon >> Cc: linux-arm-kernel@lists.infradead.org >> Cc: linux-kernel@vger.kernel.org >> Signed-off-by: Anshuman Khandual >> --- >> arch/arm64/Kconfig | 4 ++++ >> 1 file changed, 4 insertions(+) >> >> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >> index f39568b28ec1..8e3a5578f663 100644 >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -1909,6 +1909,10 @@ config ARCH_ENABLE_THP_MIGRATION >> def_bool y >> depends on TRANSPARENT_HUGEPAGE >> >> +config HUGETLB_PAGE_SIZE_VARIABLE > > Please move the definition of HUGETLB_PAGE_SIZE_VARIABLE to > mm/Kconfig and select it from the arch Kconfigfs instead of duplicating > the definition. Sure, will do.