tree: https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git kvm-unmapped-poison head: 51d4d402256b9c1b8e38be95bfa2bb28dc8189ad commit: 51d4d402256b9c1b8e38be95bfa2bb28dc8189ad [7/7] KVM: unmap guest memory with poison config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git/commit/?id=... git remote add kas https://git.kernel.org/pub/scm/linux/kernel/git/kas/linux.git git fetch --no-tags kas kvm-unmapped-poison git checkout 51d4d402256b9c1b8e38be95bfa2bb28dc8189ad # save the attached .config to linux build tree make W=1 ARCH=i386 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 >>): arch/x86/kvm/mmu/mmu.c: In function 'unmap_page': 3697 | bool unmapped; | ^~~~~~~~ vim +/unmapped +3697 arch/x86/kvm/mmu/mmu.c 3694 3695 static void unmap_page(struct page *page, gfn_t gfn) 3696 { 3698 3699 if (gfn_is_shared(gfn)) 3700 return; 3701 3702 if (TestSetPageHWPoison(page)) 3703 return; 3704 get_page(page); 3705 unmapped = try_to_unmap(page, TTU_IGNORE_MLOCK); 3706 } 3707 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org