tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.4.y head: 34d79ceec663b171ebb66575627742563f78e912 commit: 6002dcd35aa356a3ea79d106f94733e7a298f040 [573/1370] ata: make qc_prep return ata_completion_errors config: powerpc-randconfig-r015-20210216 (attached as .config) compiler: powerpc-linux-gcc (GCC) 7.5.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-4.4.y git checkout 6002dcd35aa356a3ea79d106f94733e7a298f040 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-7.5.0 make.cross ARCH=powerpc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): In file included from include/linux/scatterlist.h:7:0, from include/linux/dma-mapping.h:10, from include/linux/libata.h:32, from drivers/ata/sata_dwc_460ex.c:37: include/linux/mm.h: In function 'is_vmalloc_addr': include/linux/mm.h:386:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return addr >= VMALLOC_START && addr < VMALLOC_END; ^~ In file included from include/linux/libata.h:35:0, from drivers/ata/sata_dwc_460ex.c:37: include/linux/ata.h: In function 'ata_id_is_lba_capacity_ok': include/linux/ata.h:950:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] (lba_sects >= 16383 * 63 * id[ATA_ID_HEADS])) ^~ In file included from include/linux/blkdev.h:14:0, from include/linux/blk-mq.h:4, from include/scsi/scsi_host.h:10, from include/linux/libata.h:37, from drivers/ata/sata_dwc_460ex.c:37: include/linux/pagemap.h: In function 'fault_in_multipages_readable': include/linux/pagemap.h:632:16: warning: variable 'c' set but not used [-Wunused-but-set-variable] volatile char c; ^ In file included from include/linux/blkdev.h:18:0, from include/linux/blk-mq.h:4, from include/scsi/scsi_host.h:10, from include/linux/libata.h:37, from drivers/ata/sata_dwc_460ex.c:37: include/linux/bio.h: In function 'bio_next_split': include/linux/bio.h:424:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (sectors >= bio_sectors(bio)) ^~ In file included from drivers/ata/sata_dwc_460ex.c:37:0: include/linux/libata.h: In function 'ata_msg_init': include/linux/libata.h:113:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (dval < 0 || dval >= (sizeof(u32) * 8)) ^~ drivers/ata/sata_dwc_460ex.c: In function 'dma_dwc_xfer_setup': drivers/ata/sata_dwc_460ex.c:308:20: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast] dma_addr_t addr = (dma_addr_t)&hsdev->sata_dwc_regs->dmadr; ^ drivers/ata/sata_dwc_460ex.c: At top level: .qc_prep = sata_dwc_qc_prep, ^~~~~~~~~~~~~~~~ drivers/ata/sata_dwc_460ex.c:1158:14: note: (near initialization for 'sata_dwc_ops.qc_prep') vim +1158 drivers/ata/sata_dwc_460ex.c 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1151 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1152 static struct ata_port_operations sata_dwc_ops = { 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1153 .inherits = &ata_sff_port_ops, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1154 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1155 .error_handler = sata_dwc_error_handler, 3a8b788f61a5b8 Thang Q. Nguyen 2012-04-17 1156 .hardreset = sata_dwc_hardreset, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1157 62936009f35a66 Rupjyoti Sarmah 2010-07-06 @1158 .qc_prep = sata_dwc_qc_prep, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1159 .qc_issue = sata_dwc_qc_issue, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1160 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1161 .scr_read = sata_dwc_scr_read, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1162 .scr_write = sata_dwc_scr_write, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1163 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1164 .port_start = sata_dwc_port_start, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1165 .port_stop = sata_dwc_port_stop, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1166 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1167 .bmdma_setup = sata_dwc_bmdma_setup, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1168 .bmdma_start = sata_dwc_bmdma_start, 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1169 }; 62936009f35a66 Rupjyoti Sarmah 2010-07-06 1170 :::::: The code at line 1158 was first introduced by commit :::::: 62936009f35a6659cc3ebe0d90c754182d60da73 [libata] Add 460EX on-chip SATA driver, sata_dwc_460ex :::::: TO: Rupjyoti Sarmah <rsarmah(a)amcc.com&gt; :::::: CC: Jeff Garzik <jgarzik(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org