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=-13.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 1E322C64E7C for ; Wed, 2 Dec 2020 20:32:54 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3814D22202 for ; Wed, 2 Dec 2020 20:32:52 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3814D22202 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.ibm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 38CA46B005C; Wed, 2 Dec 2020 15:32:52 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 316336B005D; Wed, 2 Dec 2020 15:32:52 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2046C6B0068; Wed, 2 Dec 2020 15:32:52 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0252.hostedemail.com [216.40.44.252]) by kanga.kvack.org (Postfix) with ESMTP id 0B4266B005C for ; Wed, 2 Dec 2020 15:32:52 -0500 (EST) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id C815C3638 for ; Wed, 2 Dec 2020 20:32:51 +0000 (UTC) X-FDA: 77549490942.25.cast80_0508819273b6 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin25.hostedemail.com (Postfix) with ESMTP id BE1BF1804E3AF for ; Wed, 2 Dec 2020 20:32:44 +0000 (UTC) X-HE-Tag: cast80_0508819273b6 X-Filterd-Recvd-Size: 6325 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by imf29.hostedemail.com (Postfix) with ESMTP for ; Wed, 2 Dec 2020 20:32:44 +0000 (UTC) Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 0B2KVwBA130825; Wed, 2 Dec 2020 15:32:41 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=date : from : to : cc : subject : message-id : references : mime-version : content-type : in-reply-to; s=pp1; bh=7k64mIQiHaWy//PZEHcOuqC7YfTe5Wp86SAsalsGFaI=; b=rN+M6x+LlMC8bCMdbdoM2WvFtpCPRZzBTx7BP4asjjkokc01+1K/lRQSMP7ZPFCjo4yN N/2RYqkAcC9qCD+CwpB73aOJwncBnIiGWh5ZCosszqrjqmKEpRNsm2k5cvgGfildYYmc rTMB/cv0lejPpqu5zLu8XpQ/Tm7bf092666Gs5Yd7iMwiWfmlVS6G+33m3SD/OiVeLm+ 8tsWd+ZVDisIDZJl0wMckruFUGsnhh5qXz3PYbVD7Qece8PxZn5KbGGZrd8oPn+iPDlM 0BczSZ2LKl6btAnj8sc6xg6uhTf0EhlN4ZriCpjkRVqtfXMST2LVATmXg1BuPQcoKwjm JA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 3563qcaxbp-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Dec 2020 15:32:41 -0500 Received: from m0098420.ppops.net (m0098420.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 0B2KWfsF133876; Wed, 2 Dec 2020 15:32:41 -0500 Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 3563qcaxas-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Dec 2020 15:32:41 -0500 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 0B2KSDbJ001956; Wed, 2 Dec 2020 20:32:38 GMT Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by ppma04ams.nl.ibm.com with ESMTP id 35693xgefb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 02 Dec 2020 20:32:38 +0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0B2KWaHp22413764 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 2 Dec 2020 20:32:36 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4B711A4059; Wed, 2 Dec 2020 20:32:36 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 26841A404D; Wed, 2 Dec 2020 20:32:35 +0000 (GMT) Received: from osiris (unknown [9.171.12.240]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTPS; Wed, 2 Dec 2020 20:32:35 +0000 (GMT) Date: Wed, 2 Dec 2020 21:32:33 +0100 From: Heiko Carstens To: Anshuman Khandual Cc: linux-mm@kvack.org, akpm@linux-foundation.org, david@redhat.com, linux-arm-kernel@lists.infradead.org, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, Vasily Gorbik Subject: Re: [RFC V2 3/3] s390/mm: Define arch_get_mappable_range() Message-ID: <20201202203233.GB11274@osiris> References: <1606706992-26656-1-git-send-email-anshuman.khandual@arm.com> <1606706992-26656-4-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1606706992-26656-4-git-send-email-anshuman.khandual@arm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312,18.0.737 definitions=2020-12-02_12:2020-11-30,2020-12-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 suspectscore=5 priorityscore=1501 adultscore=0 clxscore=1011 impostorscore=0 malwarescore=0 lowpriorityscore=0 mlxlogscore=880 spamscore=0 mlxscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2012020119 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Nov 30, 2020 at 08:59:52AM +0530, Anshuman Khandual wrote: > This overrides arch_get_mappabble_range() on s390 platform and drops now > redundant similar check in vmem_add_mapping(). This compensates by adding > a new check __segment_load() to preserve the existing functionality. > > Cc: Heiko Carstens > Cc: Vasily Gorbik > Cc: David Hildenbrand > Cc: linux-s390@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > Signed-off-by: Anshuman Khandual > --- > arch/s390/mm/extmem.c | 5 +++++ > arch/s390/mm/vmem.c | 13 +++++++++---- > 2 files changed, 14 insertions(+), 4 deletions(-) > > diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c > index 5060956b8e7d..cc055a78f7b6 100644 > --- a/arch/s390/mm/extmem.c > +++ b/arch/s390/mm/extmem.c > @@ -337,6 +337,11 @@ __segment_load (char *name, int do_nonshared, unsigned long *addr, unsigned long > goto out_free_resource; > } > > + if (seg->end + 1 > VMEM_MAX_PHYS || seg->end + 1 < seg->start_addr) { > + rc = -ERANGE; > + goto out_resource; > + } > + > rc = vmem_add_mapping(seg->start_addr, seg->end - seg->start_addr + 1); > if (rc) > goto out_resource; > diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c > index b239f2ba93b0..06dddcc0ce06 100644 > --- a/arch/s390/mm/vmem.c > +++ b/arch/s390/mm/vmem.c > @@ -532,14 +532,19 @@ void vmem_remove_mapping(unsigned long start, unsigned long size) > mutex_unlock(&vmem_mutex); > } > > +struct range arch_get_mappable_range(void) > +{ > + struct range memhp_range; > + > + memhp_range.start = 0; > + memhp_range.end = VMEM_MAX_PHYS; > + return memhp_range; > +} > + > int vmem_add_mapping(unsigned long start, unsigned long size) > { > int ret; > > - if (start + size > VMEM_MAX_PHYS || > - start + size < start) > - return -ERANGE; > - I really fail to see how this could be considered an improvement for s390. Especially I do not like that the (central) range check is now moved to the caller (__segment_load). Which would mean potential additional future callers would have to duplicate that code as well.