linux-kernel - [arm-integrator:virt-to-pfn-v6.0-rc1 10/24] fs/iomap/direct-io.c:195:29: sparse: sparse: Using plain integer as NULL pointer

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Message-ID: <202208310538.aeMiqjUq-lkp@intel.com>
Date:   Wed, 31 Aug 2022 05:58:22 +0800
From:   kernel test robot <lkp@...el.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [arm-integrator:virt-to-pfn-v6.0-rc1 10/24]
 fs/iomap/direct-io.c:195:29: sparse: sparse: Using plain integer as NULL
 pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git virt-to-pfn-v6.0-rc1
head:   fd7709c9f1119794e96665ae423d79d93bfe43fc
commit: cb1bcb8486737f0d37b3ee9522ee44106d9875ae [10/24] ARM: mm: Make virt_to_pfn() a static inline
config: arm-randconfig-s042-20220830 (https://download.01.org/0day-ci/archive/20220831/202208310538.aeMiqjUq-lkp@intel.com/config)
compiler: arm-linux-gnueabi-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/linusw/linux-integrator.git/commit/?id=cb1bcb8486737f0d37b3ee9522ee44106d9875ae
        git remote add arm-integrator https://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-integrator.git
        git fetch --no-tags arm-integrator virt-to-pfn-v6.0-rc1
        git checkout cb1bcb8486737f0d37b3ee9522ee44106d9875ae
        # 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=arm SHELL=/bin/bash block/ fs/cifs/ fs/iomap/ lib/crypto/ net/ceph/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@...el.com>

sparse warnings: (new ones prefixed by >>)
>> fs/iomap/direct-io.c:195:29: sparse: sparse: Using plain integer as NULL pointer
--
>> block/blk-lib.c:186:53: sparse: sparse: Using plain integer as NULL pointer
--
>> net/ceph/messenger.c:247:26: sparse: sparse: Using plain integer as NULL pointer
--
>> lib/crypto/chacha20poly1305.c:60:26: sparse: sparse: Using plain integer as NULL pointer
   lib/crypto/chacha20poly1305.c:128:26: sparse: sparse: Using plain integer as NULL pointer
   lib/crypto/chacha20poly1305.c:215:26: sparse: sparse: Using plain integer as NULL pointer
--
>> lib/crypto/chacha20poly1305-selftest.c:8833:26: sparse: sparse: Using plain integer as NULL pointer

vim +195 fs/iomap/direct-io.c

db074436f42196 Darrick J. Wong   2019-07-15  190  
a6d3d49587d10d Christoph Hellwig 2021-08-10  191  static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio,
a6d3d49587d10d Christoph Hellwig 2021-08-10  192  		loff_t pos, unsigned len)
db074436f42196 Darrick J. Wong   2019-07-15  193  {
489734ef94f4f7 Eric Biggers      2022-01-28  194  	struct inode *inode = file_inode(dio->iocb->ki_filp);
db074436f42196 Darrick J. Wong   2019-07-15 @195  	struct page *page = ZERO_PAGE(0);
db074436f42196 Darrick J. Wong   2019-07-15  196  	struct bio *bio;
db074436f42196 Darrick J. Wong   2019-07-15  197  
908c54909ae72d Christoph Hellwig 2022-05-05  198  	bio = iomap_dio_alloc_bio(iter, dio, 1, REQ_OP_WRITE | REQ_SYNC | REQ_IDLE);
489734ef94f4f7 Eric Biggers      2022-01-28  199  	fscrypt_set_bio_crypt_ctx(bio, inode, pos >> inode->i_blkbits,
489734ef94f4f7 Eric Biggers      2022-01-28  200  				  GFP_KERNEL);
a6d3d49587d10d Christoph Hellwig 2021-08-10  201  	bio->bi_iter.bi_sector = iomap_sector(&iter->iomap, pos);
db074436f42196 Darrick J. Wong   2019-07-15  202  	bio->bi_private = dio;
db074436f42196 Darrick J. Wong   2019-07-15  203  	bio->bi_end_io = iomap_dio_bio_end_io;
db074436f42196 Darrick J. Wong   2019-07-15  204  
db074436f42196 Darrick J. Wong   2019-07-15  205  	get_page(page);
db074436f42196 Darrick J. Wong   2019-07-15  206  	__bio_add_page(bio, page, len, 0);
a6d3d49587d10d Christoph Hellwig 2021-08-10  207  	iomap_dio_submit_bio(iter, dio, bio, pos);
db074436f42196 Darrick J. Wong   2019-07-15  208  }
db074436f42196 Darrick J. Wong   2019-07-15  209  

:::::: The code at line 195 was first introduced by commit
:::::: db074436f421967f4f30cfbb6fbc2a728f3e62b3 iomap: move the direct IO code into a separate file

:::::: TO: Darrick J. Wong <darrick.wong@...cle.com>
:::::: CC: Darrick J. Wong <darrick.wong@...cle.com>

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp