tree: https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git queue-5.4 head: d8941b5947e4e827f27bdc4de80b27a9a094e39d commit: 217252a8f88782be21b4151e58ea05197f6900c3 [41/72] kvm: avoid speculation-based attacks from out-of-range memslot accesses config: mips-randconfig-r014-20210613 (attached as .config) compiler: mipsel-linux-gcc (GCC) 9.3.0 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/sashal/linux-stable.git/c... git remote add sashal-linux-stable https://git.kernel.org/pub/scm/linux/kernel/git/sashal/linux-stable.git git fetch --no-tags sashal-linux-stable queue-5.4 git checkout 217252a8f88782be21b4151e58ea05197f6900c3 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/mips/kvm/../../../virt/kvm/kvm_main.c:673:12: warning: no previous prototype for 'kvm_arch_post_init_vm' [-Wmissing-prototypes] 673 | int __weak kvm_arch_post_init_vm(struct kvm *kvm) | ^~~~~~~~~~~~~~~~~~~~~ arch/mips/kvm/../../../virt/kvm/kvm_main.c:682:13: warning: no previous prototype for 'kvm_arch_pre_destroy_vm' [-Wmissing-prototypes] 682 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm) | ^~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/kernel.h:11, from include/linux/list.h:9, from include/linux/preempt.h:11, from include/linux/hardirq.h:5, from include/linux/kvm_host.h:7, from arch/mips/kvm/../../../virt/kvm/kvm_main.c:18: In function '__gfn_to_hva_memslot', inlined from '__gfn_to_hva_many' at arch/mips/kvm/../../../virt/kvm/kvm_main.c:1446:9, inlined from '__gfn_to_hva_many' at arch/mips/kvm/../../../virt/kvm/kvm_main.c:1434:22: 417 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^ include/linux/compiler.h:398:4: note: in definition of macro '__compiletime_assert' 398 | prefix ## suffix(); \ | ^~~~~~ include/linux/compiler.h:417:2: note: in expansion of macro '_compiletime_assert' 417 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) | ^~~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert' 39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) | ^~~~~~~~~~~~~~~~~~ include/linux/build_bug.h:50:2: note: in expansion of macro 'BUILD_BUG_ON_MSG' 50 | BUILD_BUG_ON_MSG(condition, "BUILD_BUG_ON failed: " #condition) | ^~~~~~~~~~~~~~~~ include/linux/nospec.h:55:2: note: in expansion of macro 'BUILD_BUG_ON' 55 | BUILD_BUG_ON(sizeof(_i) > sizeof(long)); \ | ^~~~~~~~~~~~ include/linux/kvm_host.h:1054:25: note: in expansion of macro 'array_index_nospec' 1054 | unsigned long offset = array_index_nospec(gfn - slot->base_gfn, | ^~~~~~~~~~~~~~~~~~ vim +/__compiletime_assert_85 +417 include/linux/compiler.h 9a8ab1c39970a4 Daniel Santos 2013-02-21 403 9a8ab1c39970a4 Daniel Santos 2013-02-21 404 #define _compiletime_assert(condition, msg, prefix, suffix) \ 9a8ab1c39970a4 Daniel Santos 2013-02-21 405 __compiletime_assert(condition, msg, prefix, suffix) 9a8ab1c39970a4 Daniel Santos 2013-02-21 406 9a8ab1c39970a4 Daniel Santos 2013-02-21 407 /** 9a8ab1c39970a4 Daniel Santos 2013-02-21 408 * compiletime_assert - break build and emit msg if condition is false 9a8ab1c39970a4 Daniel Santos 2013-02-21 409 * @condition: a compile-time constant condition to check 9a8ab1c39970a4 Daniel Santos 2013-02-21 410 * @msg: a message to emit if condition is false 9a8ab1c39970a4 Daniel Santos 2013-02-21 411 * 9a8ab1c39970a4 Daniel Santos 2013-02-21 412 * In tradition of POSIX assert, this macro will break the build if the 9a8ab1c39970a4 Daniel Santos 2013-02-21 413 * supplied condition is *false*, emitting the supplied error message if the 9a8ab1c39970a4 Daniel Santos 2013-02-21 414 * compiler has support to do so. 9a8ab1c39970a4 Daniel Santos 2013-02-21 415 */ 9a8ab1c39970a4 Daniel Santos 2013-02-21 416 #define compiletime_assert(condition, msg) \ 3910babeac1ab0 Vegard Nossum 2020-04-06 @417 _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) 9a8ab1c39970a4 Daniel Santos 2013-02-21 418 :::::: The code at line 417 was first introduced by commit :::::: 3910babeac1ab031f4e178042cbd1af9a9a0ec51 compiler.h: fix error in BUILD_BUG_ON() reporting :::::: TO: Vegard Nossum <vegard.nossum(a)oracle.com&gt; :::::: CC: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org