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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 26 Feb 2020 11:12:28 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18878370.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 01QBCRcu37945602 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 26 Feb 2020 11:12:27 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 622EE4C044; Wed, 26 Feb 2020 11:12:27 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 333194C040; Wed, 26 Feb 2020 11:12:27 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.219]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 26 Feb 2020 11:12:27 +0000 (GMT) To: Andrew Morton , Claudio Imbrenda Cc: linux-mm@kvack.org, kvm list , linux-s390 From: Christian Borntraeger Subject: mm/gup/writeback: add callbacks for inaccessible pages: fixup for linux-next Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 20022611-0012-0000-0000-0000038A6941 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20022611-0013-0000-0000-000021C70EDA Message-Id: <1da2ebcf-59bd-65a1-222a-26af953ac7c5@de.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-02-26_03:2020-02-26,2020-02-26 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 impostorscore=0 clxscore=1015 malwarescore=0 spamscore=0 suspectscore=0 mlxscore=0 bulkscore=0 phishscore=0 mlxlogscore=725 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2002260085 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: Claudio, the patch with the arch callbacks has a (simple) merge conflict with the longterm pinning changes in next. Can you maybe re-do this patch on top of linux-next and send this patch to Andrew. This actually also means that this patch should ideally go via Andrew and not via my tree. Patch is here. https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux.git/commit/?h=next&id=732b80e677b80813e2f862ce92448436540222a3 this is my quick attempt to fix this up +++ b/mm/gup.c @@@ -470,11 -269,18 +468,17 @@@ retry goto retry; } - if (flags & FOLL_GET) { - if (unlikely(!try_get_page(page))) { - page = ERR_PTR(-ENOMEM); - goto out; - } - ret = arch_make_page_accessible(page); - if (ret) { - put_page(page); - page = ERR_PTR(ret); - goto out; - } + /* try_grab_page() does nothing unless FOLL_GET or FOLL_PIN is set. */ + if (unlikely(!try_grab_page(page, flags))) { + page = ERR_PTR(-ENOMEM); + goto out; + } ++ ret = arch_make_page_accessible(page); ++ if (ret) { ++ put_page(page); ++ page = ERR_PTR(ret); ++ goto out; + } if (flags & FOLL_TOUCH) { if ((flags & FOLL_WRITE) && !pte_dirty(pte) && !PageDirty(page)) diff --cc mm/gup.c index f589299b0d4a,354bcfbd844b..a025d28ffbfd --- a/mm/gup.c