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Mon, 8 May 2023 16:57:44 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 474F620043; Mon, 8 May 2023 16:57:44 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A46B120040; Mon, 8 May 2023 16:57:43 +0000 (GMT) Received: from osiris (unknown [9.171.72.156]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTPS; Mon, 8 May 2023 16:57:43 +0000 (GMT) Date: Mon, 8 May 2023 18:57:42 +0200 From: Heiko Carstens To: Nhat Pham Cc: kernel test robot , oe-kbuild-all@lists.linux.dev, Linux Memory Management List , Andrew Morton , gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, linux-s390@vger.kernel.org Subject: Re: [linux-next:master 14680/14811] mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer Message-ID: References: <202305070840.X0G3ofjl-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-GUID: BKayuXYXVjDh3dxCDCI7ZUV-QxTAHaPV X-Proofpoint-ORIG-GUID: tvBe10K9EcBk6Rs1rEKDyqtH9FCgADgO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-05-08_12,2023-05-05_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 suspectscore=0 impostorscore=0 spamscore=0 malwarescore=0 adultscore=0 phishscore=0 clxscore=1011 mlxlogscore=999 lowpriorityscore=0 bulkscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2305080111 X-Stat-Signature: pwtdxagssg5opds319asmzkjgcaydhg9 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: C98F8100018 X-Rspam-User: X-HE-Tag: 1683565073-593676 X-HE-Meta: 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 E/ZUFcxg 2hXrDU+bGP+EKEDu2ouUL9VmUkG75tpB2sGOY3MM+MSZw2ivfcEXKrpbvn9/MuQwvWq0iD+2v2s2Si0c378RGoEQRfBsl3oXU8/qHeXcnlp6yStAnHZtyo1D6i83MKfEikaA83h1R+9aeQ2fnxLKt3Fd9Aw== 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, May 08, 2023 at 09:45:56AM -0700, Nhat Pham wrote: > On Sat, May 6, 2023 at 5:28 PM kernel test robot wrote: > > sparse warnings: (new ones prefixed by >>) > > mm/filemap.c:1416:17: sparse: sparse: context imbalance in 'migration_entry_wait_on_locked' - unexpected unlock > > >> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer > > >> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer > > >> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer ... > > > 4250 SYSCALL_DEFINE4(cachestat, unsigned int, fd, > > Hmm I couldn't see where I used 0 as the null pointer. Maybe > this is a false positive or a result of not wiring up the syscall > for s390? Especially since this is pointed toward the macro > line (SYSCALL_DEFINE). > > cc-ing this to s390 maintainers and the s390 mailing list... > Could you help me debug this? Thanks! Just ignore, this is a known false positive with s390's SYSCALL_DEFINE() implementation vs sparse. I looked into it once, but couldn't figure out how to silence sparse. IIRC, the __TYPE_IS_PTR() macro causes this.