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Mon, 08 May 2023 10:26:13 -0700 (PDT) MIME-Version: 1.0 References: <202305070840.X0G3ofjl-lkp@intel.com> In-Reply-To: From: Nhat Pham Date: Mon, 8 May 2023 10:26:02 -0700 Message-ID: Subject: Re: [linux-next:master 14680/14811] mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer To: Heiko Carstens 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: D3A71C0008 X-Rspam-User: X-Rspamd-Server: rspam06 X-Stat-Signature: jj3wooxtp9a3bhiaj7nct6x9se6cs9wu X-HE-Tag: 1683566774-652618 X-HE-Meta: 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 taoQSnx6 XTg6qkY6Op59sQriCTKQqw09OqODRJyoIQ9WscHxIYba46o9BK+W0pdG8xqDCVj+fsRLVytPDO/6CBzgXeN+qJxHW8OjG9PHudqriJgfSghBsI1KrYpX6yhqW5ezL2FTZ/NiSzvPhDW2DKRv1aHPtJsiPnrttOKokuu0haKI9g9KEy491UNnuK+9VJX5CMqrxdNJVVFrGB20q3Q0l7rEmsLBAo5v6ffTcQphCpcy0MNWi4sxh7kWc2/JYh57I7amU/gSeKnYrXEc4oC22IrhCiF7psfWg71RsyTzhAUTBpT2bx04r9g7yyfjOSUnko8F6b5+J/TQubQX+hxlXEA8AMll1tRmjKLdQG3qQSSMTyhrYkm+ectYHLUYUUG19SFJeobm2CHTx6MCWQqM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.046292, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, May 8, 2023 at 9:57=E2=80=AFAM Heiko Carstens w= rote: > > On Mon, May 08, 2023 at 09:45:56AM -0700, Nhat Pham wrote: > > On Sat, May 6, 2023 at 5:28=E2=80=AFPM kernel test robot wrote: > > > sparse warnings: (new ones prefixed by >>) > > > mm/filemap.c:1416:17: sparse: sparse: context imbalance in 'migrat= ion_entry_wait_on_locked' - unexpected unlock > > > >> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL p= ointer > > > >> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL p= ointer > > > >> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL p= ointer > ... > > > > 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. Thanks for the prompt response and support, Heiko!