From: kernel test robot <lkp@intel.com>
To: Nhat Pham <nphamcs@gmail.com>
Cc: oe-kbuild-all@lists.linux.dev,
Linux Memory Management List <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: [linux-next:master 14680/14811] mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer
Date: Sun, 7 May 2023 08:28:20 +0800 [thread overview]
Message-ID: <202305070840.X0G3ofjl-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head: 83e5775d7afda68f6d7576d21f7a080fbfeecc4f
commit: d39c65bc7fcb1dad22dc1585fc669b5bfe5d3108 [14680/14811] cachestat: implement cachestat syscall
config: s390-randconfig-s041-20230507 (https://download.01.org/0day-ci/archive/20230507/202305070840.X0G3ofjl-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=d39c65bc7fcb1dad22dc1585fc669b5bfe5d3108
git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
git fetch --no-tags linux-next master
git checkout d39c65bc7fcb1dad22dc1585fc669b5bfe5d3108
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 olddefconfig
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202305070840.X0G3ofjl-lkp@intel.com/
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
>> mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer
vim +4250 mm/filemap.c
4215
4216 /*
4217 * The cachestat(2) system call.
4218 *
4219 * cachestat() returns the page cache statistics of a file in the
4220 * bytes range specified by `off` and `len`: number of cached pages,
4221 * number of dirty pages, number of pages marked for writeback,
4222 * number of evicted pages, and number of recently evicted pages.
4223 *
4224 * An evicted page is a page that is previously in the page cache
4225 * but has been evicted since. A page is recently evicted if its last
4226 * eviction was recent enough that its reentry to the cache would
4227 * indicate that it is actively being used by the system, and that
4228 * there is memory pressure on the system.
4229 *
4230 * `off` and `len` must be non-negative integers. If `len` > 0,
4231 * the queried range is [`off`, `off` + `len`]. If `len` == 0,
4232 * we will query in the range from `off` to the end of the file.
4233 *
4234 * The `flags` argument is unused for now, but is included for future
4235 * extensibility. User should pass 0 (i.e no flag specified).
4236 *
4237 * Currently, hugetlbfs is not supported.
4238 *
4239 * Because the status of a page can change after cachestat() checks it
4240 * but before it returns to the application, the returned values may
4241 * contain stale information.
4242 *
4243 * return values:
4244 * zero - success
4245 * -EFAULT - cstat or cstat_range points to an illegal address
4246 * -EINVAL - invalid flags
4247 * -EBADF - invalid file descriptor
4248 * -EOPNOTSUPP - file descriptor is of a hugetlbfs file
4249 */
> 4250 SYSCALL_DEFINE4(cachestat, unsigned int, fd,
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests
next reply other threads:[~2023-05-07 0:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-07 0:28 kernel test robot [this message]
2023-05-08 16:45 ` [linux-next:master 14680/14811] mm/filemap.c:4250:1: sparse: sparse: Using plain integer as NULL pointer Nhat Pham
2023-05-08 16:57 ` Heiko Carstens
2023-05-08 17:26 ` Nhat Pham
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