tree: git://git.infradead.org/users/hch/misc.git dax-block-cleanup head: f95e4c72e7784a68edcdb95f4211b9636880ff29 commit: f95e4c72e7784a68edcdb95f4211b9636880ff29 [3/3] dax: rework the dax_device <-> gendisk association config: um-x86_64_defconfig (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-block-cleanup git checkout f95e4c72e7784a68edcdb95f4211b9636880ff29 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>): ld: mm/readahead.o: in function `dax_remove_host': ld: mm/truncate.o: in function `dax_remove_host': truncate.c:(.text+0x1210): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: mm/vmscan.o: in function `dax_remove_host': vmscan.c:(.text+0x24c0): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: mm/workingset.o: in function `dax_remove_host': workingset.c:(.text+0x3a0): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: mm/memory.o: in function `dax_remove_host': memory.c:(.text+0xc70): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: fs/binfmt_elf.o: in function `dax_remove_host': binfmt_elf.c:(.text+0x3160): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: fs/iomap/buffered-io.o: in function `dax_remove_host': buffered-io.c:(.text+0x3720): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: fs/ext4/file.o: in function `dax_remove_host': file.c:(.text+0x1600): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: fs/ext4/indirect.o: in function `dax_remove_host': indirect.c:(.text+0xd20): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: fs/ext4/inode.o: in function `dax_remove_host': inode.c:(.text+0x1ed0): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here ld: fs/ext4/super.o: in function `dax_remove_host': super.c:(.text+0x2680): multiple definition of `dax_remove_host'; mm/filemap.o:filemap.c:(.text+0x47f0): first defined here -- In file included from mm/filemap.c:15: 133 | static inline int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk) | ^~~~~~~ include/linux/dax.h:137:29: warning: 'struct gendisk' declared inside parameter list will not be visible outside of this definition or declaration 137 | void dax_remove_host(struct gendisk *disk) | ^~~~~~~ 137 | void dax_remove_host(struct gendisk *disk) | ^~~~~~~~~~~~~~~ -- In file included from mm/truncate.c:13: 137 | void dax_remove_host(struct gendisk *disk) | ^~~~~~~~~~~~~~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org