Hi Wei, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on mmotm/master] url: https://github.com/0day-ci/linux/commits/Wei-Yang/mm-sparse-only-sub-section-aligned-range-would-be-populated/20200630-101713 base: git://git.cmpxchg.org/linux-mmotm.git master config: x86_64-allnoconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project cf1d04484344be52ada8178e41d18fd15a9b880c) 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 # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels _SIG_SET_OP(signotset, _sig_not) ^ include/linux/signal.h:167:2: note: expanded from macro '_SIG_SET_OP' case 2: = ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels include/linux/signal.h:169:2: note: expanded from macro '_SIG_SET_OP' case 1: = ^ include/linux/signal.h:190:2: warning: unannotated fall-through between switch labels case 1: = 0; ^ include/linux/jhash.h:95:2: note: insert '__attribute__((fallthrough));' to silence this warning case 6: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ __attribute__((fallthrough)); include/linux/jhash.h:95:2: note: insert 'break;' to avoid fall-through case 6: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; include/linux/jhash.h:96:2: warning: unannotated fall-through between switch labels case 5: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ 15include/linux/signal.h:190:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: = 0; ^ __attribute__((fallthrough)); include/linux/signal.h:190:2: note: insert 'break;' to avoid fall-through case 1: = 0; ^ break; include/linux/signal.h:203:2: warninginclude/linux/jhash.h:96:2: note: insert '__attribute__((fallthrough));' to silence this warning case 5: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ __attribute__((fallthrough)); include/linux/jhash.h:96:2: note: insert 'break;' to avoid fall-through case 5: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; include/linux/jhash.h:97:2: warning: unannotated fall-through between switch labels case 4: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ : unannotated fall-through between switch labels case 1: = -1; ^ warnings generated. include/linux/signal.h:203:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: = -1; ^ __attribute__((fallthrough)); include/linux/signal.h:15203:2: note: insert 'break;' to avoid fall-through case 1: = -1; ^ break; include/linux/jhash.h:97:2: note: insert '__attribute__((fallthrough));' to silence this warning case 4: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ __attribute__((fallthrough)); include/linux/jhash.h:97:2: note: insert 'break;' to avoid fall-through case 4: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; include/linux/jhash.h:98:2: warning: unannotated fall-through between switch labels case 3: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ include/linux/signal.h:233:2: warning: unannotated fall-through between switch labels case 1: ; ^ warnings generated. In file included from kernel/printk/printk.c:61: kernel/printk/internal.h:54:20: warninginclude/linux/jhash.h:98:2: note: insert '__attribute__((fallthrough));' to silence this warning case 3: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ __attribute__((fallthrough)); include/linux/jhash.h:98:2: note: no previous prototype for function 'vprintk_func' __printf(1, 0) int vprintk_func(const char va_list args) { return 0; } ^ kernel/printk/internal.h: insert 'break;' to avoid fall-through case 3: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; include/linux/jhash.h:99:2: warning: unannotated fall-through between switch labels case 2: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ :54:16: note: declare 'static' if the function is not intended to be used outside of this translation unit __printf(1, 0) int vprintk_func(const char va_list args) { return 0; } ^ static kernel/printk/printk.cinclude/linux/signal.h:233:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:233:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; include/linux/signal.h:245:2: warning: unannotated fall-through between switch labels case 1: ; ^ >> :165:5: warning: no previous prototype for function 'devkmsg_sysctl_set_loglvl' int devkmsg_sysctl_set_loglvl(struct ctl_table int write, ^ kernel/printk/printk.c:165:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int devkmsg_sysctl_set_loglvl(struct ctl_table int write, ^ static include/linux/jhash.h:99:2: note: insert '__attribute__((fallthrough));' to silence this warning case 2: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ __attribute__((fallthrough)); include/linux/jhash.h:99:2: note: insert 'break;' to avoid fall-through case 2: a += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; include/linux/jhash.h:100:2: warning: unannotated fall-through between switch labels case 1: a += ^ include/linux/signal.h:245:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:245:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; kernel/printk/printk.cinclude/linux/jhash.h:100:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: a += ^ __attribute__((fallthrough)); include/linux/jhash.h:100:2: note: insert 'break;' to avoid fall-through case 1: a += ^ break; include/linux/jhash.h:102:2: warning: unannotated fall-through between switch labels case 0: /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var Nothing left to add arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ include/linux/jhash.h:102:2: note: insert 'break;' to avoid fall-through case 0: /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var Nothing left to add arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; :2406:10: warning: 'sprintf' will always overflow; destination buffer has size 0, but format string expands to at least 33 len = sprintf(text, ^ include/linux/jhash.h:136:2: warning: unannotated fall-through between switch labels case 2: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ include/linux/jhash.h:136:2: note: insert '__attribute__((fallthrough));' to silence this warning case 2: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ __attribute__((fallthrough)); include/linux/jhash.h:136:2: note: insert 'break;' to avoid fall-through case 2: b += /Dockerfile /Gemfile /Gemfile.lock /bin /boot /c /cephfs /dev /etc /home /htmldocs /include /kbuild /lib /lib32 /lib64 /libx32 /lkp-cloud /lkp-src /media /mnt /opt /patch /pkg /proc /root /run /sbin /share /srv /sys /tmp /usr /var fall through arch/ block/ certs/ crypto/ drivers/ fs/ include/ init/ ipc/ kernel/ lib/ mm/ net/ scripts/ security/ sound/ source/ tools/ usr/ virt/ ^ break; include/linux/jhash.h:137:2: warning: unannotated fall-through between switch labels case 1: a += ^ In file included from kernel/capability.c:13: In file included from include/linux/audit.h:13: In file included from include/linux/ptrace.h:7: In file included from include/linux/sched/signal.h:6: include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigorsets, _sig_or) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigandsets, _sig_and) ^ include/linux/signal.h:133:2:In file included from note: expanded from macro '_SIG_SET_BINOP' case 2: ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: ^ include/linux/signal.h:153:1: warning: unannotated fall-through between switch labels _SIG_SET_BINOP(sigandnsets, _sig_andn) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: kernel/sysctl_binary.c:15: In file included from include/linux/netdevice.h:37: In file included from include/linux/ethtool.h:18: In file included from include/uapi/linux/ethtool.h:19: In file included from include/linux/if_ether.h:19: include/linux/skbuff.h:3690:2: warning: unannotated fall-through between switch labels case 24: diffs |= __it_diff(a, b, 64); ^ -- ^ __attribute__((fallthrough)); include/linux/mm.h:166:2: note: insert 'break;' to avoid fall-through case 56: ^ break; In file included from kernel/printk/printk.c:36: In file included from include/linux/syscalls.h:76: include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] _SIG_SET_BINOP(sigorsets, _sig_or) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: \ ^ include/linux/signal.h:147:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: \ ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] _SIG_SET_BINOP(sigandsets, _sig_and) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: \ ^ include/linux/signal.h:150:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: \ ^ include/linux/signal.h:153:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] _SIG_SET_BINOP(sigandnsets, _sig_andn) ^ include/linux/signal.h:133:2: note: expanded from macro '_SIG_SET_BINOP' case 2: \ ^ include/linux/signal.h:153:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] include/linux/signal.h:137:2: note: expanded from macro '_SIG_SET_BINOP' case 1: \ ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] _SIG_SET_OP(signotset, _sig_not) ^ include/linux/signal.h:167:2: note: expanded from macro '_SIG_SET_OP' case 2: set->sig[1] = op(set->sig[1]); \ ^ include/linux/signal.h:177:1: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] include/linux/signal.h:169:2: note: expanded from macro '_SIG_SET_OP' case 1: set->sig[0] = op(set->sig[0]); \ ^ include/linux/signal.h:190:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] case 1: set->sig[0] = 0; ^ include/linux/signal.h:190:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: set->sig[0] = 0; ^ __attribute__((fallthrough)); include/linux/signal.h:190:2: note: insert 'break;' to avoid fall-through case 1: set->sig[0] = 0; ^ break; include/linux/signal.h:203:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] case 1: set->sig[0] = -1; ^ include/linux/signal.h:203:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: set->sig[0] = -1; ^ __attribute__((fallthrough)); include/linux/signal.h:203:2: note: insert 'break;' to avoid fall-through case 1: set->sig[0] = -1; ^ break; include/linux/signal.h:233:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] case 1: ; ^ include/linux/signal.h:233:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:233:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; include/linux/signal.h:245:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough] case 1: ; ^ include/linux/signal.h:245:2: note: insert '__attribute__((fallthrough));' to silence this warning case 1: ; ^ __attribute__((fallthrough)); include/linux/signal.h:245:2: note: insert 'break;' to avoid fall-through case 1: ; ^ break; In file included from kernel/printk/printk.c:61: kernel/printk/internal.h:54:20: warning: no previous prototype for function 'vprintk_func' [-Wmissing-prototypes] __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; } ^ kernel/printk/internal.h:54:16: note: declare 'static' if the function is not intended to be used outside of this translation unit __printf(1, 0) int vprintk_func(const char *fmt, va_list args) { return 0; } ^ static >> kernel/printk/printk.c:165:5: warning: no previous prototype for function 'devkmsg_sysctl_set_loglvl' [-Wmissing-prototypes] int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, ^ kernel/printk/printk.c:165:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, ^ static kernel/printk/printk.c:2406:10: warning: 'sprintf' will always overflow; destination buffer has size 0, but format string expands to at least 33 [-Wfortify-source] len = sprintf(text, ^ 18 warnings generated. --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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