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Mon, 06 Feb 2023 22:10:15 +0000 Date: Tue, 7 Feb 2023 06:10:08 +0800 From: kernel test robot To: Sean Christopherson Cc: oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org, Paolo Bonzini Subject: arch/x86/kvm/mmu/paging_tmpl.h:106:24: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) Message-ID: <202302070638.iEBPQ4gL-lkp@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Sean, FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: d2d11f342b179f1894a901f143ec7c008caba43e commit: 70e41c31bc7776b262cd9f524df3dfc2b5869a0a KVM: x86/mmu: Use common logic for computing the 32/64-bit base PA mask date: 8 months ago config: x86_64-randconfig-s023-20230206 (https://download.01.org/0day-ci/archive/20230207/202302070638.iEBPQ4gL-lkp@intel.com/config) compiler: gcc-11 (Debian 11.3.0-8) 11.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-39-gce1a6720-dirty # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=70e41c31bc7776b262cd9f524df3dfc2b5869a0a git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 70e41c31bc7776b262cd9f524df3dfc2b5869a0a # save the config file mkdir build_dir && cp config build_dir/.config make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 olddefconfig make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kvm/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot sparse warnings: (new ones prefixed by >>) arch/x86/kvm/mmu/mmu.c:610:9: sparse: sparse: context imbalance in 'walk_shadow_page_lockless_begin' - different lock contexts for basic block arch/x86/kvm/mmu/mmu.c: note: in included file (through include/linux/rbtree.h, include/linux/mm_types.h, arch/x86/kvm/irq.h): include/linux/rcupdate.h:726:9: sparse: sparse: context imbalance in 'walk_shadow_page_lockless_end' - unexpected unlock arch/x86/kvm/mmu/mmu.c:2550:9: sparse: sparse: context imbalance in 'mmu_try_to_unsync_pages' - different lock contexts for basic block arch/x86/kvm/mmu/mmu.c: note: in included file: >> arch/x86/kvm/mmu/paging_tmpl.h:106:24: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) arch/x86/kvm/mmu/paging_tmpl.h:426:24: sparse: sparse: cast truncates bits from constant value (ffffffffff000 becomes fffff000) arch/x86/kvm/mmu/mmu.c:4618:57: sparse: sparse: cast truncates bits from constant value (ffffff33 becomes 33) arch/x86/kvm/mmu/mmu.c:4620:56: sparse: sparse: cast truncates bits from constant value (ffffff0f becomes f) arch/x86/kvm/mmu/mmu.c:4622:57: sparse: sparse: cast truncates bits from constant value (ffffff55 becomes 55) vim +106 arch/x86/kvm/mmu/paging_tmpl.h b3fcdb04a98035 arch/x86/kvm/mmu/paging_tmpl.h Sean Christopherson 2022-06-14 103 e04da980c35d75 arch/x86/kvm/paging_tmpl.h Joerg Roedel 2009-07-27 104 static gfn_t gpte_to_gfn_lvl(pt_element_t gpte, int lvl) 5fb07ddb183eb4 drivers/kvm/paging_tmpl.h Avi Kivity 2007-11-21 105 { e04da980c35d75 arch/x86/kvm/paging_tmpl.h Joerg Roedel 2009-07-27 @106 return (gpte & PT_LVL_ADDR_MASK(lvl)) >> PAGE_SHIFT; 5fb07ddb183eb4 drivers/kvm/paging_tmpl.h Avi Kivity 2007-11-21 107 } 5fb07ddb183eb4 drivers/kvm/paging_tmpl.h Avi Kivity 2007-11-21 108 :::::: The code at line 106 was first introduced by commit :::::: e04da980c35d75fa050ba4009ad99025432d8d7d KVM: MMU: make page walker aware of mapping levels :::::: TO: Joerg Roedel :::::: CC: Avi Kivity -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests