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Wed, 02 Mar 2022 10:59:01 +0000 Date: Wed, 2 Mar 2022 18:58:17 +0800 From: kernel test robot To: Sven Schnelle Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org, Vasily Gorbik Subject: arch/s390/kernel/syscall.c:56:1: sparse: sparse: Using plain integer as NULL pointer Message-ID: <202203021808.beYRnzDb-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sven, First bad commit (maybe != root cause): tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: fb184c4af9b9f4563e7a126219389986a71d5b5b commit: 56e62a73702836017564eaacd5212e4d0fa1c01d s390: convert to generic entry date: 1 year, 1 month ago config: s390-randconfig-s031-20220302 (https://download.01.org/0day-ci/archive/20220302/202203021808.beYRnzDb-lkp@intel.com/config) compiler: s390-linux-gcc (GCC) 11.2.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.4-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=56e62a73702836017564eaacd5212e4d0fa1c01d git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 56e62a73702836017564eaacd5212e4d0fa1c01d # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash arch/s390/kernel/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot sparse warnings: (new ones prefixed by >>) >> arch/s390/kernel/syscall.c:56:1: sparse: sparse: Using plain integer as NULL pointer >> arch/s390/kernel/syscall.c:56:1: sparse: sparse: Using plain integer as NULL pointer vim +56 arch/s390/kernel/syscall.c ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 55 a4679373cf4ee0 arch/s390/kernel/sys_s390.c Christoph Hellwig 2010-03-10 @56 SYSCALL_DEFINE1(mmap2, struct s390_mmap_arg_struct __user *, arg) ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 57 { a4679373cf4ee0 arch/s390/kernel/sys_s390.c Christoph Hellwig 2010-03-10 58 struct s390_mmap_arg_struct a; ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 59 int error = -EFAULT; ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 60 ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 61 if (copy_from_user(&a, arg, sizeof(a))) ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 62 goto out; a90f590a1bee36 arch/s390/kernel/sys_s390.c Dominik Brodowski 2018-03-11 63 error = ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset); ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 64 out: ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 65 return error; ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 66 } ^1da177e4c3f41 arch/s390/kernel/sys_s390.c Linus Torvalds 2005-04-16 67 :::::: The code at line 56 was first introduced by commit :::::: a4679373cf4ee0e7792dc56205365732b725c2c1 Add generic sys_old_mmap() :::::: TO: Christoph Hellwig :::::: CC: Linus Torvalds --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org