On Tue, Nov 7, 2023 at 8:30 AM kernel test robot <lkp@xxxxxxxxx> wrote: > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master > head: be3ca57cfb777ad820c6659d52e60bbdd36bf5ff > commit: cf264e1329fb0307e044f7675849f9f38b44c11a cachestat: implement cachestat syscall > date: 5 months ago > config: s390-randconfig-r123-20231107 (https://download.01.org/0day-ci/archive/20231108/202311080014.GABRIG2T-lkp@xxxxxxxxx/config) > compiler: s390-linux-gcc (GCC) 13.2.0 > reproduce: (https://download.01.org/0day-ci/archive/20231108/202311080014.GABRIG2T-lkp@xxxxxxxxx/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <lkp@xxxxxxxxx> > | Closes: https://lore.kernel.org/oe-kbuild-all/202311080014.GABRIG2T-lkp@xxxxxxxxx/ > > 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:4249:1: sparse: sparse: Using plain integer as NULL pointer > >> mm/filemap.c:4249:1: sparse: sparse: Using plain integer as NULL pointer > >> mm/filemap.c:4249:1: sparse: sparse: Using plain integer as NULL pointer > >> mm/filemap.c:4249:1: sparse: sparse: Using plain integer as NULL pointer > > vim +4249 mm/filemap.c > > 4214 > 4215 /* > 4216 * The cachestat(2) system call. > 4217 * > 4218 * cachestat() returns the page cache statistics of a file in the > 4219 * bytes range specified by `off` and `len`: number of cached pages, > 4220 * number of dirty pages, number of pages marked for writeback, > 4221 * number of evicted pages, and number of recently evicted pages. > 4222 * > 4223 * An evicted page is a page that is previously in the page cache > 4224 * but has been evicted since. A page is recently evicted if its last > 4225 * eviction was recent enough that its reentry to the cache would > 4226 * indicate that it is actively being used by the system, and that > 4227 * there is memory pressure on the system. > 4228 * > 4229 * `off` and `len` must be non-negative integers. If `len` > 0, > 4230 * the queried range is [`off`, `off` + `len`]. If `len` == 0, > 4231 * we will query in the range from `off` to the end of the file. > 4232 * > 4233 * The `flags` argument is unused for now, but is included for future > 4234 * extensibility. User should pass 0 (i.e no flag specified). > 4235 * > 4236 * Currently, hugetlbfs is not supported. > 4237 * > 4238 * Because the status of a page can change after cachestat() checks it > 4239 * but before it returns to the application, the returned values may > 4240 * contain stale information. > 4241 * > 4242 * return values: > 4243 * zero - success > 4244 * -EFAULT - cstat or cstat_range points to an illegal address > 4245 * -EINVAL - invalid flags > 4246 * -EBADF - invalid file descriptor > 4247 * -EOPNOTSUPP - file descriptor is of a hugetlbfs file > 4248 */ > > 4249 SYSCALL_DEFINE4(cachestat, unsigned int, fd, > > -- > 0-DAY CI Kernel Test Service > https://github.com/intel/lkp-tests/wiki This is a known false positive with s390. See this thread: https://lore.kernel.org/linux-mm/202305070840.X0G3ofjl-lkp@xxxxxxxxx/
