Hi Alex, [auto build test ERROR on vfio/next] [also build test ERROR on v4.12-rc6 next-20170619] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Alex-Williamson/vfio-Fix-release-ordering-races-and-use-driver_override/20170620-095741 base: https://github.com/awilliam/linux-vfio.git next config: powerpc-defconfig (attached as .config) compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=powerpc 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 errors (new ones prefixed by >>): arch/powerpc/kvm/../../../virt/kvm/vfio.c: In function 'kvm_vfio_set_attr': >> arch/powerpc/kvm/../../../virt/kvm/vfio.c:262:4: error: 'vfio_group' may be used uninitialized in this function [-Werror=maybe-uninitialized] kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/kvm/../../../virt/kvm/vfio.c:190:21: note: 'vfio_group' was declared here struct vfio_group *vfio_group; ^~~~~~~~~~ cc1: all warnings being treated as errors vim +/vfio_group +262 arch/powerpc/kvm/../../../virt/kvm/vfio.c 600c6bde Alex Williamson 2017-06-19 256 f.file)) ec53500f Alex Williamson 2013-10-30 257 continue; ec53500f Alex Williamson 2013-10-30 258 ec53500f Alex Williamson 2013-10-30 259 list_del(&kvg->node); 14979b3f Alex Williamson 2017-06-19 260 kvm_arch_end_assignment(dev->kvm); 14979b3f Alex Williamson 2017-06-19 261 #ifdef CONFIG_SPAPR_TCE_IOMMU 14979b3f Alex Williamson 2017-06-19 @262 kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group); 14979b3f Alex Williamson 2017-06-19 263 #endif 14979b3f Alex Williamson 2017-06-19 264 kvm_vfio_group_set_kvm(kvg->vfio_group, NULL); ec53500f Alex Williamson 2013-10-30 265 kvm_vfio_group_put_external_user(kvg->vfio_group); :::::: The code at line 262 was first introduced by commit :::::: 14979b3f26fbbe87d4240e463db53e64dd127184 kvm-vfio: Decouple only when we match a group :::::: TO: Alex Williamson <alex.williamson@xxxxxxxxxx> :::::: CC: 0day robot <fengguang.wu@xxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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