From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=klx1=BW=lists.ozlabs.org=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@kernel.org>
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=-11.5 required=3.0 tests=BAYES_00,
	HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,
	SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable
	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 B8653C433DF
	for <linuxppc-dev@archiver.kernel.org>; Wed, 12 Aug 2020 13:25:21 +0000 (UTC)
Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2])
	(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
	(No client certificate requested)
	by mail.kernel.org (Postfix) with ESMTPS id 6899C20829
	for <linuxppc-dev@archiver.kernel.org>; Wed, 12 Aug 2020 13:25:21 +0000 (UTC)
DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6899C20829
Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com
Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3])
	by lists.ozlabs.org (Postfix) with ESMTP id 4BRVnC3s0JzDqV4
	for <linuxppc-dev@archiver.kernel.org>; Wed, 12 Aug 2020 23:25:19 +1000 (AEST)
Authentication-Results: lists.ozlabs.org;
 spf=pass (sender SPF authorized) smtp.mailfrom=arm.com
 (client-ip=217.140.110.172; helo=foss.arm.com;
 envelope-from=anshuman.khandual@arm.com; receiver=<UNKNOWN>)
Authentication-Results: lists.ozlabs.org;
 dmarc=none (p=none dis=none) header.from=arm.com
Received: from foss.arm.com (foss.arm.com [217.140.110.172])
 by lists.ozlabs.org (Postfix) with ESMTP id 4BRVJZ6k1szDqC7
 for <linuxppc-dev@lists.ozlabs.org>; Wed, 12 Aug 2020 23:03:55 +1000 (AEST)
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 167D931B;
 Wed, 12 Aug 2020 06:03:52 -0700 (PDT)
Received: from [10.163.66.87] (unknown [10.163.66.87])
 by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3390C3F70D;
 Wed, 12 Aug 2020 06:03:49 -0700 (PDT)
Subject: Re: [PATCH 14/16] debug_vm_pgtable/hugetlb: Disable hugetlb test on
 ppc64
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>, linux-mm@kvack.org,
 akpm@linux-foundation.org
References: <20200812063358.369514-1-aneesh.kumar@linux.ibm.com>
 <20200812063358.369514-14-aneesh.kumar@linux.ibm.com>
From: Anshuman Khandual <anshuman.khandual@arm.com>
Message-ID: <d067c278-6391-72f1-75c2-ccbd52909233@arm.com>
Date: Wed, 12 Aug 2020 18:33:20 +0530
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.9.1
MIME-Version: 1.0
In-Reply-To: <20200812063358.369514-14-aneesh.kumar@linux.ibm.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
X-BeenThere: linuxppc-dev@lists.ozlabs.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org>
List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe>
List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/>
List-Post: <mailto:linuxppc-dev@lists.ozlabs.org>
List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help>
List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>,
 <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe>
Cc: linuxppc-dev@lists.ozlabs.org
Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org
Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>



On 08/12/2020 12:03 PM, Aneesh Kumar K.V wrote:
> The seems to be missing quite a lot of details w.r.t allocating
> the correct pgtable_t page (huge_pte_alloc()), holding the right
> lock (huge_pte_lock()) etc. The vma used is also not a hugetlb VMA.
> 
> ppc64 do have runtime checks within CONFIG_DEBUG_VM for most of these.
> Hence disable the test on ppc64.

This test is free from any platform specific #ifdefs which should
never be broken. If hugetlb_advanced_tests() does not work or is
not detailed enough for ppc64, then it would be great if you could
suggest some improvements so that it works for all enabled platforms.

> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> ---
>  mm/debug_vm_pgtable.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c
> index 529892b9be2f..3e112d0ba1b2 100644
> --- a/mm/debug_vm_pgtable.c
> +++ b/mm/debug_vm_pgtable.c
> @@ -800,6 +800,7 @@ static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot)
>  #endif /* CONFIG_ARCH_WANT_GENERAL_HUGETLB */
>  }
>  
> +#ifndef CONFIG_PPC_BOOK3S_64
>  static void __init hugetlb_advanced_tests(struct mm_struct *mm,
>  					  struct vm_area_struct *vma,
>  					  pte_t *ptep, unsigned long pfn,
> @@ -842,6 +843,7 @@ static void __init hugetlb_advanced_tests(struct mm_struct *mm,
>  	pte = huge_ptep_get(ptep);
>  	WARN_ON(!(huge_pte_write(pte) && huge_pte_dirty(pte)));
>  }
> +#endif
>  #else  /* !CONFIG_HUGETLB_PAGE */
>  static void __init hugetlb_basic_tests(unsigned long pfn, pgprot_t prot) { }
>  static void __init hugetlb_advanced_tests(struct mm_struct *mm,
> @@ -1053,7 +1055,9 @@ static int __init debug_vm_pgtable(void)
>  	pud_populate_tests(mm, pudp, saved_pmdp);
>  	spin_unlock(ptl);
>  
> -	//hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
> +#ifndef CONFIG_PPC_BOOK3S_64
> +	hugetlb_advanced_tests(mm, vma, ptep, pte_aligned, vaddr, prot);
> +#endif
>  
>  	spin_lock(&mm->page_table_lock);
>  	p4d_clear_tests(mm, p4dp);
>