On 7/14/19 11:43 PM, Damien Le Moal wrote: > On 2019/07/13 18:10, kbuild test robot wrote: >> tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/axboe/linux-block.git for-linus >> head: 787c79d6393fc028887cc1b6066915f0b094e92f >> commit: b091ac616846a1da75b1f2566b41255ce7f0e0a6 [20/23] sd_zbc: Fix report zones buffer allocation >> config: c6x-allyesconfig (attached as .config) >> compiler: c6x-elf-gcc (GCC) 7.4.0 >> reproduce: >> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross >> chmod +x ~/bin/make.cross >> git checkout b091ac616846a1da75b1f2566b41255ce7f0e0a6 >> # save the attached .config to linux build tree >> GCC_VERSION=7.4.0 make.cross ARCH=c6x >> >> If you fix the issue, kindly add following tag >> Reported-by: kbuild test robot <lkp@xxxxxxxxx> >> >> Note: it may well be a FALSE warning. FWIW you are at least aware of it now. >> http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings >> >> All warnings (new ones prefixed by >>): >> >> In file included from include/asm-generic/bug.h:18:0, >> from arch/c6x/include/asm/bug.h:12, >> from include/linux/bug.h:5, >> from include/linux/thread_info.h:12, >> from include/asm-generic/current.h:5, >> from ./arch/c6x/include/generated/asm/current.h:1, >> from include/linux/sched.h:12, >> from include/linux/blkdev.h:5, >> from drivers//scsi/sd_zbc.c:11: >> drivers//scsi/sd_zbc.c: In function 'sd_zbc_read_zones': >>>> include/linux/kernel.h:62:48: warning: 'zone_blocks' may be used uninitialized in this function [-Wmaybe-uninitialized] >> #define __round_mask(x, y) ((__typeof__(x))((y)-1)) >> ^ >> drivers//scsi/sd_zbc.c:464:6: note: 'zone_blocks' was declared here >> u32 zone_blocks; >> ^~~~~~~~~~~ > [...] > > Jens, > > This warning does not show up on x86_64 native build with gcc 9.1. > I just sent a patch to remove the warning, but I do not have a c6x cross > compilation environment available so the patch was checked only on x86. Is it a false positive, or is it legit? -- Jens Axboe
