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SubjectRe: [PATCH v2 2/2] f2fs: add F2FS_IOC_SET_COMPRESS_OPTION ioctl
Hi Daeho,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on f2fs/dev-test]
[also build test WARNING on linus/master v5.9 next-20201022]
[cannot apply to linux/master]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/Daeho-Jeong/f2fs-add-F2FS_IOC_GET_COMPRESS_OPTION-ioctl/20201022-115947
base: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git dev-test
config: x86_64-randconfig-s022-20201022 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.3-17-g2d3af347-dirty
# https://github.com/0day-ci/linux/commit/d869d11ac39edb97c13765c59163d12f56dccd6f
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Daeho-Jeong/f2fs-add-F2FS_IOC_GET_COMPRESS_OPTION-ioctl/20201022-115947
git checkout d869d11ac39edb97c13765c59163d12f56dccd6f
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


"sparse warnings: (new ones prefixed by >>)"
>> fs/f2fs/compress.c:543:44: sparse: sparse: Using plain integer as NULL pointer

vim +543 fs/f2fs/compress.c

540
541 bool f2fs_is_compress_algorithm_ready(unsigned char algorithm)
542 {
> 543 return algorithm >= COMPRESS_MAX ? false : f2fs_cops[algorithm];
544 }
545

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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