tree: git://git.infradead.org/users/hch/misc.git dax-devirtualize head: 7a0a944e2b374048589e83456809514d5961b624 commit: 7a0a944e2b374048589e83456809514d5961b624 [17/17] dax: remove the copy_from_iter and copy_to_iter methods config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): git remote add hch-misc git://git.infradead.org/users/hch/misc.git git fetch --no-tags hch-misc dax-devirtualize git checkout 7a0a944e2b374048589e83456809514d5961b624 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): 907 | static int log_dax(struct log_writes_c *lc, sector_t sector, size_t bytes, | ^~~~~~~ cc1: all warnings being treated as errors vim +/log_dax +907 drivers/md/dm-log-writes.c 0e9cebe724597a Josef Bacik 2015-03-20 905 8b9db232db1b88 Christoph Hellwig 2021-10-15 906 #if IS_ENABLED(CONFIG_FS_DAX) 976431b02c2ef9 Dan Williams 2018-03-29 @907 static int log_dax(struct log_writes_c *lc, sector_t sector, size_t bytes, 976431b02c2ef9 Dan Williams 2018-03-29 908 struct iov_iter *i) 976431b02c2ef9 Dan Williams 2018-03-29 909 { 976431b02c2ef9 Dan Williams 2018-03-29 910 struct pending_block *block; 976431b02c2ef9 Dan Williams 2018-03-29 911 976431b02c2ef9 Dan Williams 2018-03-29 912 if (!bytes) 976431b02c2ef9 Dan Williams 2018-03-29 913 return 0; 976431b02c2ef9 Dan Williams 2018-03-29 914 976431b02c2ef9 Dan Williams 2018-03-29 915 block = kzalloc(sizeof(struct pending_block), GFP_KERNEL); 976431b02c2ef9 Dan Williams 2018-03-29 916 if (!block) { 976431b02c2ef9 Dan Williams 2018-03-29 917 DMERR("Error allocating dax pending block"); 976431b02c2ef9 Dan Williams 2018-03-29 918 return -ENOMEM; 976431b02c2ef9 Dan Williams 2018-03-29 919 } 976431b02c2ef9 Dan Williams 2018-03-29 920 976431b02c2ef9 Dan Williams 2018-03-29 921 block->data = kzalloc(bytes, GFP_KERNEL); 976431b02c2ef9 Dan Williams 2018-03-29 922 if (!block->data) { 976431b02c2ef9 Dan Williams 2018-03-29 923 DMERR("Error allocating dax data space"); 976431b02c2ef9 Dan Williams 2018-03-29 924 kfree(block); 976431b02c2ef9 Dan Williams 2018-03-29 925 return -ENOMEM; 976431b02c2ef9 Dan Williams 2018-03-29 926 } 976431b02c2ef9 Dan Williams 2018-03-29 927 976431b02c2ef9 Dan Williams 2018-03-29 928 /* write data provided via the iterator */ 976431b02c2ef9 Dan Williams 2018-03-29 929 if (!copy_from_iter(block->data, bytes, i)) { 976431b02c2ef9 Dan Williams 2018-03-29 930 DMERR("Error copying dax data"); 976431b02c2ef9 Dan Williams 2018-03-29 931 kfree(block->data); 976431b02c2ef9 Dan Williams 2018-03-29 932 kfree(block); 976431b02c2ef9 Dan Williams 2018-03-29 933 return -EIO; 976431b02c2ef9 Dan Williams 2018-03-29 934 } 976431b02c2ef9 Dan Williams 2018-03-29 935 976431b02c2ef9 Dan Williams 2018-03-29 936 /* rewind the iterator so that the block driver can use it */ 976431b02c2ef9 Dan Williams 2018-03-29 937 iov_iter_revert(i, bytes); 976431b02c2ef9 Dan Williams 2018-03-29 938 976431b02c2ef9 Dan Williams 2018-03-29 939 block->datalen = bytes; 976431b02c2ef9 Dan Williams 2018-03-29 940 block->sector = bio_to_dev_sectors(lc, sector); 976431b02c2ef9 Dan Williams 2018-03-29 941 block->nr_sectors = ALIGN(bytes, lc->sectorsize) >> lc->sectorshift; 976431b02c2ef9 Dan Williams 2018-03-29 942 976431b02c2ef9 Dan Williams 2018-03-29 943 atomic_inc(&lc->pending_blocks); 976431b02c2ef9 Dan Williams 2018-03-29 944 spin_lock_irq(&lc->blocks_lock); 976431b02c2ef9 Dan Williams 2018-03-29 945 list_add_tail(&block->list, &lc->unflushed_blocks); 976431b02c2ef9 Dan Williams 2018-03-29 946 spin_unlock_irq(&lc->blocks_lock); 976431b02c2ef9 Dan Williams 2018-03-29 947 wake_up_process(lc->log_kthread); 976431b02c2ef9 Dan Williams 2018-03-29 948 976431b02c2ef9 Dan Williams 2018-03-29 949 return 0; 976431b02c2ef9 Dan Williams 2018-03-29 950 } 976431b02c2ef9 Dan Williams 2018-03-29 951 :::::: The code at line 907 was first introduced by commit :::::: 976431b02c2ef92ae3f8b6a7d699fc554025e118 dax, dm: allow device-mapper to operate without dax support :::::: TO: Dan Williams <dan.j.williams(a)intel.com&gt; :::::: CC: Dan Williams <dan.j.williams(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org